When the wave function of a large quantum system unitarily evolves away from a low-entropy initial state, there is strong circumstantial evidence it develops “branches”: a decomposition into orthogonal components that is indistinguishable from the corresponding incoherent mixture with feasible obser…

[Phys. Rev. Lett. 118, 120402] Published Fri Mar 24, 2017

]]>We investigate the relation between two approaches to the characterization of quantum Markovianity, divisibility and lack of information backflow. We show that a bijective dynamical map is completely positive divisible if and only if a monotonic nonincrease of distinguishability is observed for two …

[Phys. Rev. Lett. 118, 120501] Published Fri Mar 24, 2017

]]>A wide variety of astrophysical and cosmological sources are expected to contribute to a stochastic gravitational-wave background. Following the observations of GW150914 and GW151226, the rate and mass of coalescing binary black holes appear to be greater than many previous expectations. As a result…

[Phys. Rev. Lett. 118, 121101] Published Fri Mar 24, 2017

]]>We employ gravitational-wave radiometry to map the stochastic gravitational wave background expected from a variety of contributing mechanisms and test the assumption of isotropy using data from the Advanced Laser Interferometer Gravitational Wave Observatory’s (aLIGO) first observing run. We also s…

[Phys. Rev. Lett. 118, 121102] Published Fri Mar 24, 2017

]]>The CMS collaboration observes correlations between same and oppositely charged particles in proton-lead and lead-lead collisions. This challenges the chiral magnetic effect interpretation for charge-dependent azimuthal correlations, and indicates a common underlying mechanism for these correlations.

[Phys. Rev. Lett. 118, 122301] Published Fri Mar 24, 2017

]]>Radiative heat transfer (RHT) between macroscopic bodies at separations that are much smaller than the thermal wavelength is ruled by evanescent electromagnetic modes and can be orders of magnitude more efficient than its far-field counterpart, which is described by the Stefan-Boltzmann law. In this…

[Phys. Rev. Lett. 118, 126804] Published Fri Mar 24, 2017

]]>Predictions indicate that certain nodal superconductors with broken time-reversal symmetry have Fermi surfaces made up of charge-neutral broken Cooper pairs. This is a departure from earlier theory that accounted for the electronic structure of these superconductors via point or line nodes of the superconducting gap.

[Phys. Rev. Lett. 118, 127001] Published Fri Mar 24, 2017

]]>Magnetic waves in a permanent magnet can survive even when the material is too hot for large-scale magnetism to exist.

[Phys. Rev. Lett. 118, 127203] Published Fri Mar 24, 2017

]]>A general formalism is introduced to allow the steady state of non-Markovian processes on networks to be reduced to equivalent Markovian processes on the same substrates. The example of an epidemic spreading process is considered in detail, where all the non-Markovian aspects are shown to be capture…

[Phys. Rev. Lett. 118, 128301] Published Fri Mar 24, 2017

]]>We demonstrate numerically the existence of a nontrivial topological Haldane phase for the one-dimensional extended ($U\text{\u2212}V$) Hubbard model with a mean density of one particle per site, not only for bosons but also for anyons, despite a broken reflection parity symmetry. The Haldane insulator, surrounde…

[Phys. Rev. Lett. 118, 120401] Published Thu Mar 23, 2017

]]>We propose a new representation of the nonlinear sigma model that exhibits a manifest duality between flavor and kinematics. The fields couple exclusively through cubic Feynman vertices which define the structure constants of an underlying kinematic algebra. The action is invariant under a combinati…

[Phys. Rev. Lett. 118, 121601] Published Thu Mar 23, 2017

]]>A generic expression to compute triple parton scattering cross sections in high-energy proton-proton ($pp$) collisions is presented as a function of the corresponding single parton cross sections and the transverse parton profile of the proton encoded in an effective parameter ${\sigma}_{\text{eff},\mathrm{TPS}}$. The value of ${\sigma}_{\text{\u2026}}$

[Phys. Rev. Lett. 118, 122001] Published Thu Mar 23, 2017

]]>A homogeneous Fermi gas is experimentally realized using a uniform trapping potential, allowing for the demonstration of phenomena not visible in inhomogeneous systems.

[Phys. Rev. Lett. 118, 123401] Published Thu Mar 23, 2017

]]>We propose an optical scheme, employing optical parametric down-converters interlaced with nonlinear sign gates (NSGs), that completely converts an $n$-photon Fock-state pump to $n$ signal-idler photon pairs when the down-converters’ crystal lengths are chosen appropriately. The proof of this assertion …

[Phys. Rev. Lett. 118, 123601] Published Thu Mar 23, 2017

]]>We show that dephasing of individual atoms destroys the superradiance transition of the Dicke model, but that adding individual decay toward the spin down state can restore this transition. To demonstrate this, we present a method to give an exact solution for the $N$ atom problem with individual deph…

[Phys. Rev. Lett. 118, 123602] Published Thu Mar 23, 2017

]]>We show that steady nonuniform motion of a medium through an optical resonator can yield light amplification at the resonator frequency. High gain can be achieved if at the generated frequency the medium refractive index is close to zero or the medium has a very strong frequency dispersion. We also …

[Phys. Rev. Lett. 118, 123902] Published Thu Mar 23, 2017

]]>The flagellar beat is extracted from human sperm digital imaging microscopy and used to determine the flow around the cell and its trajectory, via boundary element simulation. Comparison of the predicted cell trajectory with observation demonstrates that simulation can predict fine-scale sperm dynam…

[Phys. Rev. Lett. 118, 124501] Published Thu Mar 23, 2017

]]>For viscously unstable, miscible Hele-Shaw displacements, we investigate the origin of the streamwise vorticity shown to be responsible for the inner splitting mechanism by Oliveira and Meiburg [J. Fluid Mech. **687** 431 (2011)]. Towards this end, we compare 3D Navier-Stokes simulation results for neut…

[Phys. Rev. Lett. 118, 124502] Published Thu Mar 23, 2017

]]>The nature of the magnetic structure arising from ion specular reflection in shock compression studies is examined by means of 1D particle-in-cell simulations. Propagation speed, field profiles, and supporting currents for this magnetic structure are shown to be consistent with a magnetosonic solito…

[Phys. Rev. Lett. 118, 125101] Published Thu Mar 23, 2017

]]>We show that graphene-dielectric multilayers give rise to an unusual tunability of the Casimir-Lifshitz forces and allow to easily realize completely different regimes within the same structure. Concerning thermal effects, graphene-dielectric multilayers take advantage of the anomalous features pred…

[Phys. Rev. Lett. 118, 126101] Published Thu Mar 23, 2017

]]>We derive an exact operatorial reformulation of the rotational invariant slave boson method, and we apply it to describe the orbital differentiation in strongly correlated electron systems starting from first principles. The approach enables us to treat strong electron correlations, spin-orbit coupl…

[Phys. Rev. Lett. 118, 126401] Published Thu Mar 23, 2017

]]>We report on the strong coupling of surface plasmon polaritons and molecular vibrations in an organic-inorganic plasmonic hybrid structure consisting of a ketone-based polymer deposited on top of a silver layer. Attenuated-total-reflection spectra of the hybrid reveal an anticrossing in the dispersi…

[Phys. Rev. Lett. 118, 126802] Published Thu Mar 23, 2017

]]>No experiment could directly test the particle-antiparticle duality of Majorana fermions, so far. However, this property represents a necessary ingredient towards the realization of topological quantum computing schemes. Here, we show how to complete this task by using microwave techniques. The dire…

[Phys. Rev. Lett. 118, 126803] Published Thu Mar 23, 2017

]]>The two primary categories for eigenstate phases of matter at a finite temperature are many-body localization (MBL) and the eigenstate thermalization hypothesis (ETH). We show that, in the paradigmatic quantum $p$-spin models of the spin-glass theory, eigenstates violate the ETH yet are not MBL either…

[Phys. Rev. Lett. 118, 127201] Published Thu Mar 23, 2017

]]>We introduce an analytic approach to many-body localization (MBL) in random spin chains. We consider MBL within a first quantized framework where it becomes a localization phenomenon in the high-dimensional lattice defined by the Hilbert space of the clean system. Designed in analogy with the field-…

[Phys. Rev. Lett. 118, 127202] Published Thu Mar 23, 2017

]]>We study spatially indirect excitons of GaAs quantum wells, confined in a $10\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mu \mathrm{m}$ electrostatic trap. Below a critical temperature of about 1 K, we detect macroscopic spatial coherence and quantized vortices in the weak photoluminescence emitted from the trap. These quantum signatures are restricted …

[Phys. Rev. Lett. 118, 127402] Published Thu Mar 23, 2017

]]>We argue that the correct definition of the electric current in the chiral kinetic theory for Weyl materials should include the Chern-Simons contribution that makes the theory consistent with the local conservation of the electric charge in electromagnetic and strain-induced pseudoelectromagnetic fi…

[Phys. Rev. Lett. 118, 127601] Published Thu Mar 23, 2017

]]>[Phys. Rev. Lett. 118, 129903] Published Thu Mar 23, 2017

]]>An experiment to search for light sterile neutrinos is conducted at a reactor with a thermal power of 2.8 GW located at the Hanbit nuclear power complex. The search is done with a detector consisting of a ton of Gd-loaded liquid scintillator in a tendon gallery approximately 24 m from the reactor co…

[Phys. Rev. Lett. 118, 121802] Published Tue Mar 21, 2017

]]>State-selective enantiomeric excess is realized using microwave-driven coherent population transfer. The method selectively promotes either $R$ or $S$ molecules to a higher rotational state by phase-controlled microwave pulses that drive electric-dipole allowed rotational transitions. We demonstrate the…

[Phys. Rev. Lett. 118, 123002] Published Tue Mar 21, 2017

]]>Complex optical networks containing one or more gain sections are investigated, and the evidence of lasing action is reported; the emission spectrum reflects the topological disorder induced by the connections. A theoretical description compares well with the measurements, mapping the networks to di…

[Phys. Rev. Lett. 118, 123901] Published Tue Mar 21, 2017

]]>We report detailed laboratory observations of the structure of a reconnection current sheet in a two-fluid plasma regime with a guide magnetic field. We observe and quantitatively analyze the quadrupolar electron pressure variation in the ion-diffusion region, as originally predicted by extended mag…

[Phys. Rev. Lett. 118, 125002] Published Tue Mar 21, 2017

]]>We study rupture fronts propagating along the interface separating two bodies at the onset of frictional motion via high-temporal-resolution measurements of the real contact area and strain fields. The strain measurements provide the energy flux and dissipation at the rupture tips. We show that the …

[Phys. Rev. Lett. 118, 125501] Published Tue Mar 21, 2017

]]>Recently, very robust universal properties have been shown to arise in one-dimensional growth processes with local stochastic rules, leading to the Kardar-Parisi-Zhang (KPZ) universality class. Yet it has remained essentially unknown how fluctuations in these systems correlate at different times. He…

[Phys. Rev. Lett. 118, 125701] Published Tue Mar 21, 2017

]]>A scanning tunneling microscope is used to excite the fluorescence of single molecules, leading to the observation of well resolved vibronic features. The work opens the way to vibronic spectroscopy with atomic-scale resolution.

[Phys. Rev. Lett. 118, 127401] Published Tue Mar 21, 2017

]]>Transport of molecular motors along protein filaments in a half-closed geometry is a common feature of biologically relevant processes in cellular protrusions. Using a lattice-gas model we study how the interplay between active and diffusive transport and mass conservation leads to localized domain …

[Phys. Rev. Lett. 118, 128101] Published Tue Mar 21, 2017

]]>New theoretical work predicts the conditions under which sea ice will clog a narrow channel to create a natural bridge across it.

[Phys. Rev. Lett. 118, 128701] Published Tue Mar 21, 2017

]]>We propose a novel strategy to constrain the bottom and charm Yukawa couplings by exploiting Large Hadron Collider (LHC) measurements of transverse momentum distributions in Higgs production. Our method does not rely on the reconstruction of exclusive final states or heavy-flavor tagging. Compared t…

[Phys. Rev. Lett. 118, 121801] Published Mon Mar 20, 2017

]]>We report on a quantum electrodynamic (QED) investigation of the interaction between a ground state atom with another atom in an excited state. General expressions, applicable to any atom, are indicated for the long-range tails that are due to virtual resonant emission and absorption into and from v…

[Phys. Rev. Lett. 118, 123001] Published Mon Mar 20, 2017

]]>The resistive interchange mode destabilized by the resonant interaction with the trapped energetic ions is fully suppressed when the injected power of electron cyclotron heating exceeds a certain threshold. It is shown for the first time that the complete stabilization of the energetic-particle-driv…

[Phys. Rev. Lett. 118, 125001] Published Mon Mar 20, 2017

]]>Bosonic symmetry protected topological (BSPT) states, the bosonic analogue of topological insulators, have attracted enormous theoretical interest in the last few years. Although BSPT states have been classified by various approaches, there is so far no successful experimental realization of any BSP…

[Phys. Rev. Lett. 118, 126801] Published Mon Mar 20, 2017

]]>[Phys. Rev. Lett. 118, 129901] Published Mon Mar 20, 2017

]]>[Phys. Rev. Lett. 118, 129902] Published Mon Mar 20, 2017

]]>Experiments and computer simulations show that the segregation of small and large rocks on an asteroid’s surface can arise from the way particles hitting the surface collide with the rocks already present.

[Phys. Rev. Lett. 118, 111101] Published Fri Mar 17, 2017

]]>Ferrofluid flowing down a pipe is predicted to form either clockwise or counterclockwise swirls at the center of the pipe, and axial motion at the edges.

[Phys. Rev. Lett. 118, 114503] Published Fri Mar 17, 2017

]]>Superconductors containing magnetic impurities exhibit intriguing phenomena derived from the competition between Cooper pairing and Kondo screening. At the heart of this competition are the Yu-Shiba-Rusinov (Shiba) states which arise from the pair breaking effects a magnetic impurity has on a superc…

[Phys. Rev. Lett. 118, 117001] Published Fri Mar 17, 2017

]]>Novel hidden special relativity Poincaré symmetries enable the construction of exactly solvable models of classical and quantum charge dynamics in laser fields, potentially allowing analytical studies of laser-matter interactions beyond the plane-wave approximation.

[Phys. Rev. Lett. 118, 113202] Published Thu Mar 16, 2017

]]>We experimentally demonstrate cooling of trapped ions by collisions with cotrapped, higher-mass neutral atoms. It is shown that the lighter ${{}^{39}\mathrm{K}}^{+}$ ions, created by ionizing ${}^{39}\mathrm{K}$ atoms in a magneto-optical trap (MOT), when trapped in an ion trap and subsequently allowed to cool by collisions with ultrac…

[Phys. Rev. Lett. 118, 113401] Published Thu Mar 16, 2017

]]>The maximum speed at which a liquid can wet a solid is limited by the need to displace gas lubrication films in front of the moving contact line. The characteristic height of these films is often comparable to the mean free path in the gas so that hydrodynamic models do not adequately describe the f…

[Phys. Rev. Lett. 118, 114502] Published Thu Mar 16, 2017

]]>The positions of quantum dots inside a microstructure can be determined by monitoring how an applied strain affects the dots’ photoluminescence.

[Phys. Rev. Lett. 118, 117401] Published Thu Mar 16, 2017

]]>A major challenge in optical quantum processing is implementing large, stable interferometers. We offer a novel approach: virtual, measurement-based interferometers that are programed on the fly solely by the choice of homodyne measurement angles. The effects of finite squeezing are captured as unif…

[Phys. Rev. Lett. 118, 110503] Published Wed Mar 15, 2017

]]>We introduce a tensor renormalization group scheme for coarse graining a two-dimensional tensor network that can be successfully applied to both classical and quantum systems on and off criticality. The key innovation in our scheme is to deform a 2D tensor network into small loops and then optimize …

[Phys. Rev. Lett. 118, 110504] Published Wed Mar 15, 2017

]]>The source-free Maxwell action is invariant under electric-magnetic duality rotations in arbitrary spacetimes. This leads to a conserved classical Noether charge. We show that this conservation law is broken at the quantum level in the presence of a background classical gravitational field with a no…

[Phys. Rev. Lett. 118, 111301] Published Wed Mar 15, 2017

]]>We propose new searches for axionlike particles (ALPs) produced in flavor-changing neutral current (FCNC) processes. This proposal exploits the often-overlooked coupling of ALPs to ${W}^{\pm}$ bosons, leading to FCNC production of ALPs even in the absence of a direct coupling to fermions. Our proposed search…

[Phys. Rev. Lett. 118, 111802] Published Wed Mar 15, 2017

]]>Using proton-proton collision data corresponding to an integrated luminosity of $3.0\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{fb}}^{-1}$, recorded by the LHCb detector at center-of-mass energies of 7 and 8 TeV, the ${B}_{c}^{+}\to {D}^{0}{K}^{+}$ decay is observed with a statistical significance of 5.1 standard deviations. By normalizing to ${B}^{+}\to {\overline{D}}^{0}{\pi}^{+}$ decays, a measurem…

[Phys. Rev. Lett. 118, 111803] Published Wed Mar 15, 2017

]]>We report the selective population of Rb or Cs $np$ ${{}^{2}P}_{\frac{3}{2}}$ ($n=5$, 6; $F=4$, 5) hyperfine states by the photodissociation of a transient, alkali-rare gas diatomic molecule. Circularly polarized (${\sigma}^{-}$), amplified spontaneous emission (ASE) on the ${D}_{2}$ line of Rb or Cs (780.0 and 852.1 nm, respectively) is genera…

[Phys. Rev. Lett. 118, 113201] Published Wed Mar 15, 2017

]]>The observation of ordered flow patterns in a weakly turbulent liquid may lead to new ways of predicting the evolution of turbulent flow.

[Phys. Rev. Lett. 118, 114501] Published Wed Mar 15, 2017

]]>Parametric envelope and sum envelope resonances are analyzed to revisit the validity of an assumed stop band and design limit of high intensity linear accelerators at a longitudinal phase advance of 90° per focusing lattice period. While the 90° limit is unquestioned in the transverse plane, we show…

[Phys. Rev. Lett. 118, 114803] Published Wed Mar 15, 2017

]]>Cooling atomic gases into strongly correlated quantum phases requires estimates of the entropy to perform thermometry and establish viability. We construct an ansatz partition function for models of Laughlin states of atomic gases by combining high temperature series expansions with exact diagonaliz…

[Phys. Rev. Lett. 118, 115302] Published Wed Mar 15, 2017

]]>We study the response of the one-dimensional charge density wave in ${\mathrm{K}}_{0.3}{\mathrm{MoO}}_{3}$ to different types of excitation with femtosecond optical pulses. We compare direct excitation of the lattice at midinfrared frequencies with injection of quasiparticles across the low energy charge density wave gap and wit…

[Phys. Rev. Lett. 118, 116402] Published Wed Mar 15, 2017

]]>In quantum many-body systems with a U(1) symmetry, such as particle number conservation and axial spin conservation, there are two distinct types of excitations: charge-neutral excitations and charged excitations. The energy gaps of these excitations may be independent from each other in strongly co…

[Phys. Rev. Lett. 118, 117205] Published Wed Mar 15, 2017

]]>We computationally study the micromechanics of shear-induced size segregation and propose distinct migration mechanisms for individual large and small particles. While small particles percolate through voids without enduring contacts, large particles climb under shear through their crowded neighborh…

[Phys. Rev. Lett. 118, 118001] Published Wed Mar 15, 2017

]]>When two populations of “particles” move in opposite directions, like oppositely charged colloids under an electric field or intersecting flows of pedestrians, they can move collectively, forming lanes along their direction of motion. The nature of this “laning transition” is still being debated and…

[Phys. Rev. Lett. 118, 118002] Published Wed Mar 15, 2017

]]>[Phys. Rev. Lett. 118, 119901] Published Wed Mar 15, 2017

]]>High-dimensional entanglement offers promising perspectives in quantum information science. In practice, however, the main challenge is to devise efficient methods to characterize high-dimensional entanglement, based on the available experimental data which is usually rather limited. Here we report …

[Phys. Rev. Lett. 118, 110501] Published Tue Mar 14, 2017

]]>Researchers have devised an improved method for checking whether two particles are entangled.

[Phys. Rev. Lett. 118, 110502] Published Tue Mar 14, 2017

]]>We report the first direct measurement of decays of the ${\mathrm{\Lambda}}_{c}^{+}$ baryon involving the neutron. The analysis is performed using $567\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{pb}}^{-1}$ of ${e}^{+}{e}^{-}$ collision data collected at $\sqrt{s}=4.599\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{GeV}$ with the BESIII detector at the BEPCII collider. We observe the decay ${\mathrm{\Lambda}}_{c}^{+}\to n{K}_{S}^{0}{\pi}^{+}$ and measure the absolute branching fra…

[Phys. Rev. Lett. 118, 112001] Published Tue Mar 14, 2017

]]>We consider light scattering off a two-dimensional (2D) dipolar array and show how it can be tailored by properly choosing the lattice constant of the order of the incident wavelength. In particular, we demonstrate that such arrays can operate as a nearly perfect mirror for a wide range of incident …

[Phys. Rev. Lett. 118, 113601] Published Tue Mar 14, 2017

]]>We present a method allowing for the imposition of two independent and arbitrary phase profiles on any pair of orthogonal states of polarization—linear, circular, or elliptical—relying only on simple, linearly birefringent wave plate elements arranged into metasurfaces. This stands in contrast to pr…

[Phys. Rev. Lett. 118, 113901] Published Tue Mar 14, 2017

]]>The phases of periodically driven systems of bosons and fermions are topologically classified by pairs of coprime integers.

[Phys. Rev. Lett. 118, 115301] Published Tue Mar 14, 2017

]]>We analyze large deviations of the time-averaged activity in the one-dimensional Fredrickson-Andersen model, both numerically and analytically. The model exhibits a dynamical phase transition, which appears as a singularity in the large deviation function. We analyze the finite-size scaling of this …

[Phys. Rev. Lett. 118, 115702] Published Tue Mar 14, 2017

]]>We show that applying magnetic fields up to 30 T has a dramatic effect on the ultrafast spin dynamics in ferrimagnetic GdFeCo. Upon increasing the field beyond a critical value, the dynamics induced by a femtosecond laser excitation strongly increases in amplitude and slows down significantly. Such …

[Phys. Rev. Lett. 118, 117203] Published Tue Mar 14, 2017

]]>In a Kondo lattice, the spin exchange coupling between a local spin and the conduction electrons acquires nonlocal contributions due to conduction electron scattering from surrounding local spins and the subsequent RKKY interaction. It leads to a hitherto unrecognized interference of Kondo screening…

[Phys. Rev. Lett. 118, 117204] Published Tue Mar 14, 2017

]]>We present a measurement of angular observables and a test of lepton flavor universality in the $B\to {K}^{*}{\ell}^{+}{\ell}^{-}$ decay, where $\ell $ is either $e$ or $\mu $. The analysis is performed on a data sample corresponding to an integrated luminosity of $711\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{fb}}^{-1}$ containing $772\times 1{0}^{6}$ $B\overline{B}$ pairs, collected at the $\mathrm{\Upsilon}(4S)$ resonance w…

[Phys. Rev. Lett. 118, 111801] Published Mon Mar 13, 2017

]]>Two studies explore the properties of vortices formed by electrons that travel at relativistic speeds.

[Phys. Rev. Lett. 118, 114801] Published Mon Mar 13, 2017

]]>Two studies explore the properties of vortices formed by electrons that travel at relativistic speeds.

[Phys. Rev. Lett. 118, 114802] Published Mon Mar 13, 2017

]]>We give an intuitive geometric explanation for the apparent breakdown of standard finite-size scaling in systems with periodic boundaries above the upper critical dimension. The Ising model and self-avoiding walk are simulated on five-dimensional hypercubic lattices with free and periodic boundary c…

[Phys. Rev. Lett. 118, 115701] Published Mon Mar 13, 2017

]]>We present direct experimental evidence of broken chirality in graphene by analyzing electron scattering processes at energies ranging from the linear (Dirac-like) to the strongly trigonally warped region. Furthermore, we are able to measure the energy of the van Hove singularity at the $M$ point of t…

[Phys. Rev. Lett. 118, 116401] Published Mon Mar 13, 2017

]]>In disordered systems, the hopping conductivity regime is usually realized at low temperatures where spin-related phenomena differ strongly from the cases of delocalized carriers. We develop the unified microscopic theory of current-induced spin orientation, spin-galvanic, and spin-Hall effects for …

[Phys. Rev. Lett. 118, 116801] Published Mon Mar 13, 2017

]]>Spin-phonon coupling mediated by single ion anisotropy was investigated using optical spectroscopy and first-principles calculations in the all-in–all-out pyrochlore magnet ${\mathrm{Cd}}_{2}{\mathrm{Os}}_{2}{\mathrm{O}}_{7}$. Clear anomalies were observed in both the phonon frequencies and linewidths at the magnetic ordering temperature. The…

[Phys. Rev. Lett. 118, 117201] Published Mon Mar 13, 2017

]]>We report the existence of anomalous metamagnetic fluctuations in the vicinity of the dynamic phase transition (DPT) that do not occur for the corresponding thermodynamic behavior of simple ferromagnets. Our results demonstrate that key characteristics associated with the DPT are qualitatively diffe…

[Phys. Rev. Lett. 118, 117202] Published Mon Mar 13, 2017

]]>Extending general relativity by adding extra degrees of freedom is a popular approach for explaining the accelerated expansion of the Universe and to build high energy completions of the theory of gravity. The presence of such new degrees of freedom is, however, tightly constrained from several obse…

[Phys. Rev. Lett. 118, 101301] Published Fri Mar 10, 2017

]]>We report the first measurements of size-resolved photoelectron angular distributions for the valence orbitals of neutral water clusters with up to 20 molecules. A systematic decrease of the photoelectron anisotropy is found for clusters with up to 5–6 molecules, and most remarkably, convergence of …

[Phys. Rev. Lett. 118, 103402] Published Fri Mar 10, 2017

]]>We study three-body recombination in an ultracold Bose-Fermi mixture. We first show theoretically that, for weak interspecies coupling, the loss rate is proportional to Tan’s contact. Second, using a ${}^{7}\mathrm{Li}/{}^{6}\mathrm{Li}$ mixture we probe the recombination rate in both the thermal and dual superfluid regimes. We …

[Phys. Rev. Lett. 118, 103403] Published Fri Mar 10, 2017

]]>We show that a homogeneous and isotropic slab, illuminated by a circularly polarized beam with no topological charge, produces vortices of order 2 in the opposite circularly polarized components of the reflected and transmitted fields, as a consequence of the transverse magnetic and transverse elect…

[Phys. Rev. Lett. 118, 104301] Published Fri Mar 10, 2017

]]>Accelerated charges radiate, and therefore must lose energy. The impact of this energy loss on particle motion, called radiation reaction, becomes significant in intense-laser matter interactions, where it can reduce collision energies, hinder particle acceleration schemes, and is seemingly unavoida…

[Phys. Rev. Lett. 118, 105004] Published Fri Mar 10, 2017

]]>We present a first-principles-based many-body typical medium dynamical cluster approximation and density function theory method for characterizing electron localization in disordered structures. This method applied to monolayer hexagonal boron nitride shows that the presence of boron vacancies could…

[Phys. Rev. Lett. 118, 106404] Published Fri Mar 10, 2017

]]>We report a low-temperature scanning tunneling microscopy study of the charge density wave (CDW) order in $1T\text{\u2212}{\mathrm{TiSe}}_{2}$ and ${\mathrm{Cu}}_{0.08}{\mathrm{TiSe}}_{2}$. In pristine $1T\text{\u2212}{\mathrm{TiSe}}_{2}$ we observe a long-range coherent commensurate CDW (CCDW) order. In contrast, ${\mathrm{Cu}}_{0.08}{\mathrm{TiSe}}_{2}$ displays an incommensurate CDW (ICDW) phase with localized…

[Phys. Rev. Lett. 118, 106405] Published Fri Mar 10, 2017

]]>The Weyl semimetal phase is a recently discovered topological quantum state of matter characterized by the presence of topologically protected degeneracies near the Fermi level. These degeneracies are the source of exotic phenomena, including the realization of chiral Weyl fermions as quasiparticles…

[Phys. Rev. Lett. 118, 106406] Published Fri Mar 10, 2017

]]>We calculate the two-terminal current noise generated by a magnetic moment coupled to a helical edge of a two-dimensional topological insulator. When the system is symmetric with respect to in-plane spin rotation, the noise is dominated by the Nyquist component even in the presence of a voltage bias…

[Phys. Rev. Lett. 118, 106802] Published Fri Mar 10, 2017

]]>We study the effect of applied strain as a physical control parameter for the phase transitions of $\mathrm{Ca}({\mathrm{Fe}}_{1-x}{\mathrm{Co}}_{x}{)}_{2}{\mathrm{As}}_{2}$ using resistivity, magnetization, x-ray diffraction, and ${}^{57}\mathrm{Fe}$ Mössbauer spectroscopy. Biaxial strain, namely, compression of the basal plane of the tetragonal unit cell, is created thr…

[Phys. Rev. Lett. 118, 107002] Published Fri Mar 10, 2017

]]>Croconic acid crystals show proton displacive-type ferroelectricity with a large spontaneous polarization reaching $20\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mu \mathrm{C}/{\mathrm{cm}}^{2}$, which originates from the strong coupling of proton and $\pi $-electron degrees of freedom. Such a coupling makes us expect a large polarization change by photoirradiations. Opti…

[Phys. Rev. Lett. 118, 107404] Published Fri Mar 10, 2017

]]>An organic crystal was switched between paraelectric and ferroelectric states in a picosecond. Similar materials could eventually serve as extremely fast digital switches.

[Phys. Rev. Lett. 118, 107602] Published Fri Mar 10, 2017

]]>We model theoretically a two-dimensional electron gas (2DEG) covered by a superconductor and demonstrate that topological superconducting channels are formed when stripes of the superconducting layer are removed. As a consequence, Majorana bound states (MBSs) are created at the ends of the stripes. …

[Phys. Rev. Lett. 118, 107701] Published Fri Mar 10, 2017

]]>[Phys. Rev. Lett. 118, 108901] Published Fri Mar 10, 2017

]]>[Phys. Rev. Lett. 118, 108902] Published Fri Mar 10, 2017

]]>[Phys. Rev. Lett. 118, 109904] Published Fri Mar 10, 2017

]]>The dark photon and the axion (or axionlike particle) are popular light particles of the hidden sector. Each of them has been actively searched for through the couplings called the vector portal and the axion portal. We introduce a new portal connecting the dark photon and the axion (axion–photon–da…

[Phys. Rev. Lett. 118, 101802] Published Thu Mar 09, 2017

]]>We report on the experimental generation of relativistic electron bunches with a tunable longitudinal bunch shape. A longitudinal bunch-shaping (LBS) beam line, consisting of a transverse mask followed by a transverse-to-longitudinal emittance exchange (EEX) beam line, is used to tailor the longitud…

[Phys. Rev. Lett. 118, 104801] Published Thu Mar 09, 2017

]]>A comprehensive study of fully frequency-resolved nonlinear kinetic energy transfer has been performed for the first time in a diverted tokamak, providing new insight into the parametric dependences of edge turbulence transitions. Measurements using gas puff imaging in the turbulent $L$-mode state ill…

[Phys. Rev. Lett. 118, 105003] Published Thu Mar 09, 2017

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