Can the most “classical-like” of all quantum states, namely the Schrödinger coherent state of a harmonic oscillator, exhibit nonclassical behavior? We find that for an oscillating object initially in a coherent state, merely by observing at various instants which spatial region the object is in, the...

[Phys. Rev. Lett. 120, 210402] Published Fri May 25, 2018

]]>We propose a novel method utilizing stellar kinematic data to detect low-mass substructure in the Milky Way’s dark matter halo. By probing characteristic wakes that a passing dark matter subhalo leaves in the phase-space distribution of ambient halo stars, we estimate sensitivities down to subhalo m...

[Phys. Rev. Lett. 120, 211101] Published Fri May 25, 2018

]]>The Majorana Demonstrator is an ultralow-background experiment searching for neutrinoless double-beta decay in ${}^{76}\mathrm{Ge}$. The heavily shielded array of germanium detectors, placed nearly a mile underground at the Sanford Underground Research Facility in Lead, South Dakota, also allows searches for new ex...

[Phys. Rev. Lett. 120, 211804] Published Fri May 25, 2018

]]>We present the design of a passive, on-chip microwave circulator based on a ring of superconducting tunnel junctions. We investigate two distinct physical realizations, based on Josephson junctions (JJs) or quantum phase slip elements (QPS), with microwave ports coupled either capacitively (JJ) or i...

[Phys. Rev. Lett. 120, 213602] Published Fri May 25, 2018

]]>A quantum network model connects spins in silicon-vacancy centers in diamond with phonon interactions in a 1D waveguide.

[Phys. Rev. Lett. 120, 213603] Published Fri May 25, 2018

]]>Reflective geometric phase flat optics made from chiral anisotropic media recently unveiled a promising route towards polychromatic beam shaping. However, these broadband benefits are strongly mitigated by the fact that flipping the incident helicity does not ensure geometric phase reversal. Here we...

[Phys. Rev. Lett. 120, 213903] Published Fri May 25, 2018

]]>A time quasicrystal phase emerges in a magnon Bose-Einstein condensate under periodic driving and transforms to a time crystal when the driving is switched off.

[Phys. Rev. Lett. 120, 215301] Published Fri May 25, 2018

]]>Mean-field electrostatics is used to calculate the bending moduli of an electric double layer for fixed surface charge density of a macroion in a symmetric $1:1$ electrolyte. The resulting expressions for bending stiffness, Gaussian modulus, and spontaneous curvature refer to a general underlying equa...

[Phys. Rev. Lett. 120, 215502] Published Fri May 25, 2018

]]>Instability patterns of rolling up a sleeve appear more intricate than the ones of walking over a rug on floor, both characterized as systems of uniaxially compressed soft film on stiff substrate. This can be explained by curvature effects. To investigate pattern transitions on a curved surface, we ...

[Phys. Rev. Lett. 120, 215503] Published Fri May 25, 2018

]]>Tricriticality, as a sister of criticality, is a fundamental and absorbing issue in condensed-matter physics. It has been verified that the bosonic Wilson-Fisher universality class can be changed by gapless fermionic modes at criticality. However, the counterpart phenomena at tricriticality have rar...

[Phys. Rev. Lett. 120, 215702] Published Fri May 25, 2018

]]>We report continuous measurements of the sound velocity along the principal Hugoniot curve of $\alpha $ quartz between 0.25 and 1.45 TPa, as determined from lateral release waves intersecting the shock front as a function of time in decaying-shock experiments. The measured sound velocities are lower than pr...

[Phys. Rev. Lett. 120, 215703] Published Fri May 25, 2018

]]>The formation of stable radiation damage in solids often proceeds via complex dynamic annealing (DA) processes, involving point defect migration and interaction. The dependence of DA on irradiation conditions remains poorly understood even for Si. Here, we use a pulsed ion beam method to study defec...

[Phys. Rev. Lett. 120, 216101] Published Fri May 25, 2018

]]>Electron correlation effects are studied in ZrSiS using a combination of first-principles and model approaches. We show that basic electronic properties of ZrSiS can be described within a two-dimensional lattice model of two nested square lattices. A high degree of electron-hole symmetry characteris...

[Phys. Rev. Lett. 120, 216401] Published Fri May 25, 2018

]]>The topological phases of periodically driven, or Floquet systems, rely on a perfectly periodic modulation of system parameters in time. Even the smallest deviation from periodicity leads to decoherence, causing the boundary (end) states to leak into the system’s bulk. Here, we show that in one dime...

[Phys. Rev. Lett. 120, 216801] Published Fri May 25, 2018

]]>The emergence of a magnetic field when the material is bent is predicted to be a signature for chiral superconductivity.

[Phys. Rev. Lett. 120, 217002] Published Fri May 25, 2018

]]>The Kitaev quantum spin liquid displays the fractionalization of quantum spins into Majorana fermions. The emergent Majorana edge current is predicted to manifest itself in the form of a finite thermal Hall effect, a feature commonly discussed in topological superconductors. Here we report on therma...

[Phys. Rev. Lett. 120, 217205] Published Fri May 25, 2018

]]>The singularities of the dynamical response function are one of the most remarkable effects in many-body interacting systems. However in one dimension these divergences only exist strictly at zero temperature, making their observation very difficult in most cold atomic experimental settings. Moreove...

[Phys. Rev. Lett. 120, 217206] Published Fri May 25, 2018

]]>Strontium titanate (${\mathrm{SrTiO}}_{3}$) is the quintessential material for oxide electronics. One of its hallmark features is the transition, driven by antiferrodistortive (AFD) lattice modes, from a cubic to a ferroelastic low-temperature phase. Here we investigate the evolution of the ferroelastic twin walls ...

[Phys. Rev. Lett. 120, 217601] Published Fri May 25, 2018

]]>Distinctive sounds emanate from a material when it is stressed by an outside force and close to slipping—an effect that could lead to warnings of imminent material failure.

[Phys. Rev. Lett. 120, 218003] Published Fri May 25, 2018

]]>[Phys. Rev. Lett. 120, 219601] Published Fri May 25, 2018

]]>[Phys. Rev. Lett. 120, 219602] Published Fri May 25, 2018

]]>[Phys. Rev. Lett. 120, 219901] Published Fri May 25, 2018

]]>We show that time-reflection symmetry in periodically driven (Floquet) quantum systems enables an inherently nonequilibrium phenomenon structurally similar to quantum-mechanical supersymmetry. In particular, we find Floquet analogs of the Witten index that place lower bounds on the degeneracies of s...

[Phys. Rev. Lett. 120, 210603] Published Thu May 24, 2018

]]>Bloch oscillations—first predicted to occur for electrons in a crystal—have been observed in an optical lattice containing ultracold atoms.

[Phys. Rev. Lett. 120, 213201] Published Thu May 24, 2018

]]>We show that electrowetting (EW) with structured electrodes significantly modifies the distribution of drops condensing onto flat hydrophobic surfaces by aligning the drops and by enhancing coalescence. Numerical calculations demonstrate that drop alignment and coalescence are governed by the drop-s...

[Phys. Rev. Lett. 120, 214502] Published Thu May 24, 2018

]]>A new approach to calculate one-body density profiles of nonuniform systems uses local force density distributions rather than spatial distributions to achieve improved statistical accuracy.

[Phys. Rev. Lett. 120, 218001] Published Thu May 24, 2018

]]>Researchers perform a quantum computation of the binding energy of the deuteron using a web connection to remote quantum devices.

[Phys. Rev. Lett. 120, 210501] Published Wed May 23, 2018

]]>A proposed new cosmological production mechanism for QCD axion dark matter that involves parametric resonance in field oscillation predicts larger axion masses than the conventional misalignment mechanism.

[Phys. Rev. Lett. 120, 211602] Published Wed May 23, 2018

]]>Twin Higgs (TH) models explain the absence of new colored particles responsible for natural electroweak symmetry breaking (EWSB). All known ultraviolet completions of TH models require some nonperturbative dynamics below the Planck scale. We propose a supersymmetric model in which the TH mechanism i...

[Phys. Rev. Lett. 120, 211803] Published Wed May 23, 2018

]]>The $\mathrm{\Omega}\mathrm{\Omega}$ system in the ${}^{1}{S}_{0}$ channel (the most strange dibaryon) is studied on the basis of the ($2+1$)-flavor lattice QCD simulations with a large volume $(8.1\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{fm}{)}^{3}$ and nearly physical pion mass ${m}_{\pi}\simeq 146\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{MeV}$ at a lattice spacing of $a\simeq 0.0846\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{fm}$. We show that lattice QCD data analysis by the HAL QCD method...

[Phys. Rev. Lett. 120, 212001] Published Wed May 23, 2018

]]>Ground-state two-proton ($2p$) radioactivity is a rare decay mode found in a few very proton-rich isotopes. The $2p$ decay lifetime and properties of emitted protons carry invaluable information on nuclear structure in the presence of a low-lying proton continuum. The recently measured $2p$ decay of ${}^{67}\mathrm{Kr}$ ...

[Phys. Rev. Lett. 120, 212502] Published Wed May 23, 2018

]]>High-dimensional quantum information processing promises capabilities beyond the current state of the art, but addressing individual information-carrying modes presents a significant experimental challenge. Here we demonstrate effective high-dimensional operations in the time-frequency domain of non...

[Phys. Rev. Lett. 120, 213601] Published Wed May 23, 2018

]]>Glassy carbon is a technologically important material with isotropic properties that is nongraphitizing up to $\sim 3000\text{\hspace{0.17em}}\xb0\mathrm{C}$ and displays complete or “superelastic” recovery from large compression. The pressure limit of these properties is not yet known. Here we use experiments and modeling to show perman...

[Phys. Rev. Lett. 120, 215701] Published Wed May 23, 2018

]]>We observe strong interlayer magnon-magnon coupling in an on-chip nanomagnonic device at room temperature. Ferromagnetic nanowire arrays are integrated on a 20-nm-thick yttrium iron garnet (YIG) thin film strip. Large anticrossing gaps up to 1.58 GHz are observed between the ferromagnetic resonance ...

[Phys. Rev. Lett. 120, 217202] Published Wed May 23, 2018

]]>We demonstrate that light resonant with the band gap forces the antiferromagnetic semiconductor EuSe to enter ferromagnetic alignment in the picosecond timescale. A photon generates an electron-hole pair, whose electron forms a supergiant spin polaron of magnetic moment of nearly 6000 Bohr magnetons...

[Phys. Rev. Lett. 120, 217203] Published Wed May 23, 2018

]]>Magnetic droplets are nontopological dynamical solitons that can be nucleated in nanocontact based spin torque nano-oscillators (STNOs) with perpendicular magnetic anisotropy free layers. While theory predicts that the droplet should be of the same size as the nanocontact, its inherent drift instabi...

[Phys. Rev. Lett. 120, 217204] Published Wed May 23, 2018

]]>We provide a generic scheme to separate the particles of a mixture by their physical properties like mass, friction, or size. The scheme employs a periodically shaken two-dimensional dissipative lattice and hinges on a simultaneous transport of particles in species-specific directions. This selectiv...

[Phys. Rev. Lett. 120, 218002] Published Wed May 23, 2018

]]>The dynamics of bosons in generic multimode systems, such as Bose-Hubbard models, are not only determined by interactions among the particles, but also by their mutual indistinguishability manifested in many-particle interference. We introduce a measure of indistinguishability for Fock states of bos...

[Phys. Rev. Lett. 120, 210401] Published Tue May 22, 2018

]]>We describe a framework to reduce the computational effort to evaluate large deviation functions of time integrated observables within nonequilibrium steady states. We do this by incorporating an auxiliary dynamics into trajectory based Monte Carlo calculations, through a transformation of the syste...

[Phys. Rev. Lett. 120, 210602] Published Tue May 22, 2018

]]>We propose a spatiotemporal quench protocol that allows for the fast preparation of ground states of gapless models with Lorentz invariance. Assuming the system initially resides in the ground state of a corresponding massive model, we show that a superluminally moving “front” that *locally* quenches ...

[Phys. Rev. Lett. 120, 210604] Published Tue May 22, 2018

]]>We construct the exceptional sigma model: a two-dimensional sigma model coupled to a supergravity background in a manifestly (formally) ${E}_{D(D)}$-covariant manner. This formulation of the background is provided by exceptional field theory (EFT), which unites the metric and form fields of supergravity in...

[Phys. Rev. Lett. 120, 211601] Published Tue May 22, 2018

]]>The final analysis of data collected by the OPERA experiment improves the precision of measurements of neutrinos oscillating between muon and tau flavors.

[Phys. Rev. Lett. 120, 211801] Published Tue May 22, 2018

]]>A direct search for the standard model Higgs boson decaying to a pair of charm quarks is presented. Associated production of the Higgs and $Z$ bosons, in the decay mode $ZH\to {\ell}^{+}{\ell}^{-}c\overline{c}$ is studied. A data set with an integrated luminosity of $36.1\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{fb}}^{-1}$ of $pp$ collisions at $\sqrt{s}=13\mathrm{TeV}$ recorded by the ATLAS exper...

[Phys. Rev. Lett. 120, 211802] Published Tue May 22, 2018

]]>A sequence of low-energy levels in ${{}_{32}{}^{78}\mathrm{Ge}}_{46}$ has been identified with spins and parity of ${2}^{+}$, ${3}^{+}$, ${4}^{+}$, ${5}^{+}$, and ${6}^{+}$. Decays within this band proceed strictly through $\mathrm{\Delta}J=1$ transitions, unlike similar sequences in neighboring Ge and Se nuclei. Above the ${2}^{+}$ level, members of this sequence do not decay into...

[Phys. Rev. Lett. 120, 212501] Published Tue May 22, 2018

]]>Two-photon Rabi splitting in a cavity-dot system provides a basis for multiqubit coherent control in a quantum photonic network. Here we report on two-photon Rabi splitting in a strongly coupled cavity-dot system. The quantum dot was grown intentionally large in size for a large oscillation strength...

[Phys. Rev. Lett. 120, 213901] Published Tue May 22, 2018

]]>We predict the onset of self-induced parametric or Faraday instabilities in a laser, spontaneously caused by the presence of pump depletion, which leads to a periodic gain landscape for light propagating in the cavity. As a result of the instability, continuous wave oscillation becomes unstable even...

[Phys. Rev. Lett. 120, 213902] Published Tue May 22, 2018

]]>Symmetry broken states arise naturally in oscillatory networks. In this Letter, we investigate chaotic attractors in an ensemble of four mean-coupled Stuart-Landau oscillators with two oscillators being synchronized. We report that these states with partially broken symmetry, so-called chimera state...

[Phys. Rev. Lett. 120, 214101] Published Tue May 22, 2018

]]>Granular gases as dilute ensembles of particles in random motion are at the basis of elementary structure-forming processes in the Universe, involved in many industrial and natural phenomena, and also excellent models to study fundamental statistical dynamics. The essential difference to molecular g...

[Phys. Rev. Lett. 120, 214301] Published Tue May 22, 2018

]]>We report an experimental observation of a flow topology transition via global bifurcation in a turbulent Rayleigh-Bénard convection. This transition corresponds to a spontaneous symmetry breaking with the flow becomes more turbulent. Simultaneous measurements of the large-scale flow (LSF) structure...

[Phys. Rev. Lett. 120, 214501] Published Tue May 22, 2018

]]>Three-dimensional discrete dislocation dynamics (3D-DDD) simulations reveal that, with reduction of sample size in the submicron regime, the mechanism of plastic flow localization in irradiated materials transitions from irradiation-controlled to an intrinsic dislocation source controlled. Furthermo...

[Phys. Rev. Lett. 120, 215501] Published Tue May 22, 2018

]]>We find that the reduction in dielectric response (depolarization) of water caused by solvated ions is different for ${\mathrm{H}}_{2}\mathrm{O}$ and ${\mathrm{D}}_{2}\mathrm{O}$. This isotope dependence allows us to reliably determine the kinetic contribution to the depolarization, which is found to be significantly smaller than predicted by exist...

[Phys. Rev. Lett. 120, 216001] Published Tue May 22, 2018

]]>The determination of the electronic structure by edge geometry is unique to graphene. In theory, an evanescent nonchiral edge state is predicted at the zigzag edges of graphene. Up to now, the approach used to study zigzag-edged graphene has mostly been limited to scanning tunneling microscopy. The ...

[Phys. Rev. Lett. 120, 216601] Published Tue May 22, 2018

]]>Recent observations of two nodeless gaps in superconducting ${\mathrm{CeCu}}_{2}{\mathrm{Si}}_{2}$ have raised intensive debates on its exact gap symmetry, while a satisfactory theoretical basis is still lacking. Here we propose a phenomenological approach to calculate the superconducting gap functions, taking into consideration...

[Phys. Rev. Lett. 120, 217001] Published Tue May 22, 2018

]]>Envisaged applications of Skyrmions in magnetic memory and logic devices crucially depend on the stability and mobility of these topologically nontrivial magnetic textures in thin films. We present for the first time quantitative maps of the magnetic induction that provide evidence for a 3D modulati...

[Phys. Rev. Lett. 120, 217201] Published Tue May 22, 2018

]]>We demonstrate experimentally that a photonic crystal made of ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ cylinders exhibits topological time-reversal symmetric electromagnetic propagation, similar to the quantum spin Hall effect in electronic systems. A pseudospin degree of freedom in the electromagnetic system representing different s...

[Phys. Rev. Lett. 120, 217401] Published Tue May 22, 2018

]]>In this Letter, we investigate stochastic stability in a two-phenotype evolutionary game model for an infinite, well-mixed population undergoing discrete, nonoverlapping generations. We assume that the fitness of a phenotype is an exponential function of its expected payoff following random pairwise...

[Phys. Rev. Lett. 120, 218101] Published Tue May 22, 2018

]]>A fundamental limit on the heat produced when erasing a bit of information has been confirmed in a fully quantum system.

[Phys. Rev. Lett. 120, 210601] Published Mon May 21, 2018

]]>To identify which principles characterize quantum correlations, it is essential to understand in which sense this set of correlations differs from that of almost-quantum correlations. We solve this problem by invoking the so-called no-restriction hypothesis, an explicit and natural axiom in many rec...

[Phys. Rev. Lett. 120, 200402] Published Fri May 18, 2018

]]>We developed a novel perturbative expansion based on the replica trick for the Floquet Hamiltonian governing the dynamics of periodically kicked systems where the kick strength is the small parameter. The expansion is formally equivalent to an infinite resummation of the Baker-Campbell-Hausdorff ser...

[Phys. Rev. Lett. 120, 200607] Published Fri May 18, 2018

]]>Detection of the characteristic spectrum of pulsating neutron stars can be a powerful tool not only to probe the nuclear equation of state but also to test modifications to general relativity. However, the shift in the oscillation spectrum induced by modified theories of gravity is often small and d...

[Phys. Rev. Lett. 120, 201104] Published Fri May 18, 2018

]]>Holographic theories with classical gravity duals are maximally chaotic; i.e., they saturate the universal bound on the rate of growth of chaos [J. Maldacena, S. H. Shenker, and D. Stanford, J. High Energy Phys. 08 (**2016**) 106]. It is interesting to ask whether this property is true only for leading ...

[Phys. Rev. Lett. 120, 201604] Published Fri May 18, 2018

]]>Differential cross sections and photon-beam asymmetries for the $\overrightarrow{\gamma}p\to {\pi}^{-}{\mathrm{\Delta}}^{++}(1232)$ reaction have been measured for $0.7<\mathrm{cos}{\theta}_{\pi}^{\mathrm{c}.\mathrm{m}.}<1$ and ${E}_{\gamma}=1.5\u20132.95\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{GeV}$ at SPring-8/LEPS. The first-ever high statistics cross-section data are obtained in this kinematical region, and the asymmetry data for $1.5<{E}_{\gamma}...$

[Phys. Rev. Lett. 120, 202004] Published Fri May 18, 2018

]]>A search for resonancelike structures in the ${B}_{s}^{0}{\pi}^{\pm}$ invariant mass spectrum is performed using proton-proton collision data collected by the CMS experiment at the LHC at $\sqrt{s}=8\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{TeV}$, corresponding to an integrated luminosity of $19.7\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{fb}}^{-1}$. The ${B}_{s}^{0}$ mesons are reconstructed in the decay chain ${B}_{s}^{0}\to J/\psi \varphi $, wi...

[Phys. Rev. Lett. 120, 202005] Published Fri May 18, 2018

]]>A search for the exotic meson $X(5568)$ decaying into the ${B}_{s}^{0}{\pi}^{\pm}$ final state is performed using data corresponding to $9.6\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{fb}}^{-1}$ from $p\overline{p}$ collisions at $\sqrt{s}=1960\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{GeV}$ recorded by the Collider Detector at Fermilab. No evidence for this state is found and an upper limit of 6.7% at the 95% confidence level is...

[Phys. Rev. Lett. 120, 202006] Published Fri May 18, 2018

]]>A search for the narrow structure, $X(5568)$, reported by the D0 Collaboration in the decay sequence $X\to {B}_{s}^{0}{\pi}^{\pm}$, ${B}_{s}^{0}\to J/\psi \varphi $, is presented. The analysis is based on a data sample recorded with the ATLAS detector at the LHC corresponding to $4.9\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{fb}}^{-1}$ of $pp$ collisions at 7 TeV and $19.5\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{fb}}^{-1}$ at 8 TeV. No sign...

[Phys. Rev. Lett. 120, 202007] Published Fri May 18, 2018

]]>We analyze and propose a solution to the apparent inconsistency between our current knowledge of the equation of state of asymmetric nuclear matter, the energy of the isobaric analog state (IAS) in a heavy nucleus such as ${}^{208}\mathrm{Pb}$, and the isospin symmetry breaking forces in the nuclear medium. This is...

[Phys. Rev. Lett. 120, 202501] Published Fri May 18, 2018

]]>Efficient nonlinear optical frequency mixing in small volumes is key for future on-chip photonic devices. However, the generally low conversion efficiency severely limits miniaturization to nanoscale dimensions. Here we demonstrate that gradient-field effects can provide for an efficient, convention...

[Phys. Rev. Lett. 120, 203903] Published Fri May 18, 2018

]]>Breaking Lorentz reciprocity was believed to be a prerequisite for nonreciprocal transmissions of light fields, so the possibility of nonreciprocity by linear optical systems was mostly ignored. We put forward a structure of three mutually coupled microcavities or optical fiber rings to realize opti...

[Phys. Rev. Lett. 120, 203904] Published Fri May 18, 2018

]]>Disentangling the evolution of a coherent mean-flow and turbulent fluctuations, interacting through the nonlinearity of the Navier-Stokes equations, is a central issue in fluid mechanics. It affects a wide range of flows, such as planetary atmospheres, plasmas, or wall-bounded flows, and hampers tur...

[Phys. Rev. Lett. 120, 204505] Published Fri May 18, 2018

]]>A dual ion species plasma expansion scheme from a novel target structure is introduced, in which a nanometer-thick layer of pure deuterium exists as a buffer species at the target-vacuum interface of a hydrogen plasma. Modeling shows that by controlling the deuterium layer thickness, a composite ${\mathrm{H}}^{+}/{\mathrm{...}}^{}$

[Phys. Rev. Lett. 120, 204801] Published Fri May 18, 2018

]]>Through the perturbation formula of time-dependent density functional theory broadly employed in the calculation of solids, we provide a first-principles calculation of x-ray Thomson scattering spectrum of isochorically heated aluminum foil, as considered in the experiments of Sperling *et al.* [Phys....

[Phys. Rev. Lett. 120, 205002] Published Fri May 18, 2018

]]>We perform a statistical assessment of solar wind stability at 1 AU against ion sources of free energy using Nyquist’s instability criterion. In contrast to typically employed threshold models which consider a single free-energy source, this method includes the effects of proton and ${\mathrm{He}}^{2+}$ temperature...

[Phys. Rev. Lett. 120, 205102] Published Fri May 18, 2018

]]>The local atomic structures of amorphous Ge-Sb-Te phase-change materials have yet to be clarified and the rapid crystal-amorphous phase change resulting in distinct optical contrast is not well understood. We report the direct observation of local atomic structures in amorphous ${\mathrm{Ge}}_{2}{\mathrm{Sb}}_{2}{\mathrm{Te}}_{5}$ using “loca...

[Phys. Rev. Lett. 120, 205502] Published Fri May 18, 2018

]]>We present a physically intuitive model of molecular quantum dots beyond the constant interaction approximation. It accurately describes their charging behavior and allows the extraction of important molecular properties that are otherwise experimentally inaccessible. The model is applied to data re...

[Phys. Rev. Lett. 120, 206801] Published Fri May 18, 2018

]]>The nontrivial feature and penetration depth of the topological surface states (TSS) in ${\mathrm{SmB}}_{6}$ were studied via spin pumping. The experiments used ${\mathrm{SmB}}_{6}$ thin films grown on the bulk magnetic insulator ${\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$ (YIG). Upon the excitation of magnetization precession in the YIG, a spin current is generate...

[Phys. Rev. Lett. 120, 207206] Published Fri May 18, 2018

]]>We show that a femtosecond spin-current pulse can generate terahertz (THz) transients at Rashba interfaces between two nonmagnetic materials. Our results unambiguously demonstrate the importance of the interface in this conversion process that we interpret in terms of the inverse Rashba Edelstein ef...

[Phys. Rev. Lett. 120, 207207] Published Fri May 18, 2018

]]>Photoluminescence experiments in the ultra-low density limit of an individual exciton reveal an enhanced exciton diffusion effect in atomically thin WS${}_{2}$ monolayers.

[Phys. Rev. Lett. 120, 207401] Published Fri May 18, 2018

]]>The formation of polar nanoregions through solid-solution additions is known to enhance significantly the functional properties of ferroelectric materials. Despite considerable progress in characterizing the microscopic behavior of polar nanoregions (PNR), understanding their real-space atomic struc...

[Phys. Rev. Lett. 120, 207603] Published Fri May 18, 2018

]]>We explore the stability of three-dimensional Weyl and Dirac semimetals subject to quasiperiodic potentials. We present numerical evidence that the semimetal is stable for weak quasiperiodic potentials, despite being unstable for weak random potentials. As the quasiperiodic potential strength increa...

[Phys. Rev. Lett. 120, 207604] Published Fri May 18, 2018

]]>We perform Landau-Zener-Stückelberg-Majorana (LZSM) spectroscopy on a system with strong spin-orbit interaction (SOI), realized as a single hole confined in a gated double quantum dot. Analogous to electron systems, at a magnetic field $B=0$ and high modulation frequencies, we observe photon-assisted ...

[Phys. Rev. Lett. 120, 207701] Published Fri May 18, 2018

]]>Soft materials like gels and creams exhibit fatigue resulting from the stretching of their constituent fibers, according to experiments and simulations.

[Phys. Rev. Lett. 120, 208005] Published Fri May 18, 2018

]]>The intrinsic longitudinal and transverse dispersivity of bidisperse random packings of spheres with size ratio $5:1$ was determined by pulsed field gradient nuclear magnetic resonance, in the dilute regime where small spheres occupy between 0% and 5% of the packings’ volume. Small spheres plugging po...

[Phys. Rev. Lett. 120, 208006] Published Fri May 18, 2018

]]>The one-clean-qubit model (or the deterministic quantum computation with one quantum bit model) is a restricted model of quantum computing where all but a single input qubits are maximally mixed. It is known that the probability distribution of measurement results on three output qubits of the one-c...

[Phys. Rev. Lett. 120, 200502] Published Thu May 17, 2018

]]>Topological qubits based on $SU(N)$-symmetric valence-bond solid models are constructed. A logical topological qubit is the ground subspace with twofold degeneracy, which is due to the spontaneous breaking of a global parity symmetry. A logical $Z$ rotation by an angle $2\pi /N$, for any integer $N>2$, is p...

[Phys. Rev. Lett. 120, 200503] Published Thu May 17, 2018

]]>We show that under certain conditions an axisymmetric rotating spacetime contains a ring of points in the equatorial plane, where a particle at rest with respect to an asymptotic static observer remains at rest in a static orbit. We illustrate the emergence of such orbits for boson stars. Further ex...

[Phys. Rev. Lett. 120, 201103] Published Thu May 17, 2018

]]>We present the generation and detection of squeezed light in the $2\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mu \mathrm{m}$ wavelength region. This experiment is a crucial step in realizing the quantum noise reduction techniques that will be required for future generations of gravitational-wave detectors. Squeezed vacuum is generated via degenerate op...

[Phys. Rev. Lett. 120, 203603] Published Thu May 17, 2018

]]>We develop an analytic model that relates intensity correlation measurements performed by an image sensor to the properties of photon pairs illuminating it. Experiments using an effective single-photon counting camera, a linear electron-multiplying charge-coupled device camera, and a standard CCD ca...

[Phys. Rev. Lett. 120, 203604] Published Thu May 17, 2018

]]>Relative motion of the normal and superfluid components of helium II results in the quantum Kelvin-Helmholtz instability (KHI) at their common free surface. We found the integrability and exact growing solutions for the nonlinear stage of the development of that instability. Contrary to the usual KH...

[Phys. Rev. Lett. 120, 204504] Published Thu May 17, 2018

]]>This study traces the emergence of sheared axial flow from collisional drift-wave turbulence with broken symmetry in a linear plasma device—the controlled shear decorrelation experiment. As the density profile steepens, the axial Reynolds stress develops and drives a radially sheared axial flow that...

[Phys. Rev. Lett. 120, 205001] Published Thu May 17, 2018

]]>It is shown through multidimensional particle-in-cell simulations that at least in Maxwellian background plasmas the long-wavelength transverse instability of plasma electron holes is caused not by the previously proposed focusing of trapped particles but instead by kinematic jetting of marginally p...

[Phys. Rev. Lett. 120, 205101] Published Thu May 17, 2018

]]>An MRI imaging technique reveals a structure of domains with different chirality in a slab of superfluid helium-3.

[Phys. Rev. Lett. 120, 205301] Published Thu May 17, 2018

]]>We show that the recently introduced iterative backflow wave function can be interpreted as a general neural network in continuum space with nonlinear functions in the hidden units. Using this wave function in variational Monte Carlo simulations of liquid ${}^{4}\mathrm{He}$ in two and three dimensions, we typicall...

[Phys. Rev. Lett. 120, 205302] Published Thu May 17, 2018

]]>The polarizability $\alpha $ determines the absorption, extinction, and scattering by small particles. Beyond being purely set by scatterer size and material, in fact polarizability can be affected by backaction: the influence of the photonic environment on the scatterer. As such, controlling the strength o...

[Phys. Rev. Lett. 120, 206101] Published Thu May 17, 2018

]]>The spin states of ${\mathrm{Co}}^{3+}$ ions in perovskite-type ${\mathrm{LaCoO}}_{3}$, governed by the complex interplay between the electron-lattice interactions and the strong electron correlations, still remain controversial due to the lack of experimental techniques which can directly detect them. In this Letter, we revealed ...

[Phys. Rev. Lett. 120, 206402] Published Thu May 17, 2018

]]>Analytical conformal field theory and numerical density matrix renormalization group methods are combined to create a model of a quantum spin chain or Majorana chain that exhibits a tricritical Ising point.

[Phys. Rev. Lett. 120, 206403] Published Thu May 17, 2018

]]>We report on magnetization, sound-velocity, and magnetocaloric-effect measurements of the Ising-like spin-$1/2$ antiferromagnetic chain system ${\mathrm{BaCo}}_{2}{\mathrm{V}}_{2}{\mathrm{O}}_{8}$ as a function of temperature down to 1.3 K and an applied transverse magnetic field up to 60 T. While across the Néel temperature of ${T}_{N}\sim 5\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{K}$ anomalie...

[Phys. Rev. Lett. 120, 207205] Published Thu May 17, 2018

]]>Pyroelectricity is a very promising phenomenon in three- and two-dimensional materials, but first-principles calculations have not so far been used to elucidate the underlying mechanisms. Here we report density-functional theory (DFT) calculations based on the Born-Szigeti theory of pyroelectricity,...

[Phys. Rev. Lett. 120, 207602] Published Thu May 17, 2018

]]>Shear jamming (SJ) occurs for frictional granular materials with packing fractions $\varphi $ in ${\varphi}_{S}<\varphi <{\varphi}_{J}^{0}$, when the material is subject to shear strain $\gamma $ starting from a force-free state. Here, ${\varphi}_{J}^{\mu}$ is the isotropic jamming point for particles with a friction coefficient $\mu $. SJ states have mechanically s...

[Phys. Rev. Lett. 120, 208004] Published Thu May 17, 2018

]]>We investigate the large length and long time scales collective flows and structural rearrangements within *in vitro* human bronchial epithelial cell (HBEC) cultures. Activity-driven collective flows result in ensembles of vortices randomly positioned in space. By analyzing a large population of vorti...

[Phys. Rev. Lett. 120, 208101] Published Thu May 17, 2018

]]>In water, networks of semiflexible fibrils of the protein $\alpha $-synuclein stiffen significantly with increasing temperature. We make plausible that this reversible stiffening is a result of hydrophobic contacts between the fibrils that become more prominent with increasing temperature. The good agreemen...

[Phys. Rev. Lett. 120, 208102] Published Thu May 17, 2018

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