Using ${e}^{+}{e}^{-}$ annihilation data corresponding to an integrated luminosity of $3.19\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{fb}}^{-1}$ collected at a center-of-mass energy of 4.178 GeV with the BESIII detector, we measure the absolute branching fractions ${\mathcal{B}}_{{D}_{s}^{+}\to \eta {e}^{+}{\nu}_{e}}=(2.323\pm {0.063}_{\text{stat}}\pm {0.063}_{\text{syst}})\%$ and ${\mathcal{B}}_{{D}_{s}^{+}\to {\eta}^{\prime}{e}^{+}{\nu}_{e}}=(0.824\pm {0.073}_{\text{stat}}\pm {0.027}_{\text{syst}})\%$ via a tagg...

[Phys. Rev. Lett. 122, 121801] Published Mon Mar 25, 2019

]]>An opaque barrier in a waveguide transmits more when sandwiched between disordered diffusive slabs.

[Phys. Rev. Lett. 122, 125501] Published Mon Mar 25, 2019

]]>A multifaceted *first-principles* approach utilizing density functional theory, evolutionary algorithms, and lattice dynamics was used to construct the phase diagram of silicon up to 4 TPa and $26\text{\hspace{0.17em}}000\text{\hspace{0.17em}}\text{\hspace{0.17em}}\text{K}$. These calculations predicted that (i) an anomalous sequence of face-centered cubic to body-centere...

[Phys. Rev. Lett. 122, 125701] Published Mon Mar 25, 2019

]]>Using large-scale quantum Monte Carlo simulations, the Higgs mode in the metal-organic compound C${}_{9}$H${}_{18}$N${}_{2}$CuBr${}_{4}$ is explained as a two-magnon bound state in the strongly anisotropic (Ising) limit.

[Phys. Rev. Lett. 122, 127201] Published Mon Mar 25, 2019

]]>We identify and explore the intriguing property of resource resonance arising within resource theories of entanglement, coherence, and thermodynamics. While the theories considered are reversible asymptotically, the same is generally not true in realistic scenarios where the available resources are ...

[Phys. Rev. Lett. 122, 110403] Published Fri Mar 22, 2019

]]>We address the nature of phase transitions in periodically driven systems coupled to a bath. The latter enables a synchronized nonequilibrium Floquet steady state at finite entropy, which we analyze for rapid drives within a nonequilibrium renormalization group (RG) approach. While the infinitely ra...

[Phys. Rev. Lett. 122, 110602] Published Fri Mar 22, 2019

]]>We use population inference to explore the impact that uncertainties in the distribution of binary black holes (BBH) have on the astrophysical gravitational-wave background (AGWB). Our results show that the AGWB monopole is sensitive to the nature of the BBH population (particularly the local merger...

[Phys. Rev. Lett. 122, 111101] Published Fri Mar 22, 2019

]]>We relate an $l$-loop Feynman integral to a sum of phase space integrals, where the integrands are determined by the spanning trees of the original $l$-loop graph. Causality requires that the propagators of the trees have a modified $i\delta $ prescription, and we present a simple formula for the correct $i\delta $ pre...

[Phys. Rev. Lett. 122, 111603] Published Fri Mar 22, 2019

]]>We present a twistorlike formula for the complete tree-level $S$ matrix of six-dimensional (6D) (2,0) supergravity coupled to 21 Abelian tensor multiplets. This is the low-energy effective theory that corresponds to type IIB superstring theory compactified on a $\mathrm{K}3$ surface. The formula is expressed as ...

[Phys. Rev. Lett. 122, 111604] Published Fri Mar 22, 2019

]]>A quantum-dot-based device combines all of the attributes necessary for producing a reliable source of entangled photons for quantum information applications.

[Phys. Rev. Lett. 122, 113602] Published Fri Mar 22, 2019

]]>The recent experimental observation of spinor self-ordering of ultracold atoms in optical resonators has set the stage for the exploration of emergent magnetic orders in quantum-gas-cavity systems. Based on this platform, we introduce a generic scheme for the implementation of long-range quantum spi...

[Phys. Rev. Lett. 122, 113603] Published Fri Mar 22, 2019

]]>Metasurfaces allow tailored control of electromagnetic wave fronts. However, due to local conservation of power flow, passive, lossless, and reflectionless metasurfaces have been limited to imparting phase discontinuities—and not power density discontinuities—onto a wave front. Here, we show how the...

[Phys. Rev. Lett. 122, 113901] Published Fri Mar 22, 2019

]]>Snapping of a slender structure is utilized in a wide range of natural and manmade systems, mostly to achieve rapid movement without relying on musclelike elements. Although several mechanisms for elastic energy storage and rapid release have been studied in detail, a general understanding of the ap...

[Phys. Rev. Lett. 122, 114301] Published Fri Mar 22, 2019

]]>In transition-metal perovskites ($AB{\mathrm{O}}_{3}$) most physical properties are tunable by structural parameters such as the rotation of the $B{\mathrm{O}}_{6}$ octahedra. Examples include the Néel temperature of orthoferrites, the conductivity of mixed-valence manganites, or the band gap of rare-earth scandates. Since oxides ...

[Phys. Rev. Lett. 122, 116401] Published Fri Mar 22, 2019

]]>The monopnictides TaAs and TaP are well-established Weyl semimetals. Yet, a precise assignment of Fermi arcs, accommodating the predicted chiral charge of the bulk Weyl points, has been difficult in these systems, and the topological character of different surface features in the Fermi surface is no...

[Phys. Rev. Lett. 122, 116402] Published Fri Mar 22, 2019

]]>A topological superconductor ring is uniquely characterized by a switch in the ground state fermion number parity upon insertion of one superconducting flux quantum—a direct consequence of the topological “parity anomaly.” Despite the many other tantalizing signatures and applications of topological...

[Phys. Rev. Lett. 122, 117001] Published Fri Mar 22, 2019

]]>Recently discovered superconducting P-doped ${\mathrm{EuFe}}_{2}{\mathrm{As}}_{2}$ compounds reveal the situation when the superconducting critical temperature substantially exceeds the ferromagnetic transition temperature. The main mechanism of the interplay between magnetism and superconductivity occurs to be an electromagneti...

[Phys. Rev. Lett. 122, 117002] Published Fri Mar 22, 2019

]]>We study ultracold dipolar excitons confined in a $10\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mu \mathrm{m}$ trap of a double GaAs quantum well. Based on the local density approximation, we unveil for the first time the equation of state of excitons. Specifically, in this regime and below a critical temperature of about 1 K, we show that for a local ...

[Phys. Rev. Lett. 122, 117402] Published Fri Mar 22, 2019

]]>We study an array of coupled optical cavities in the presence of two-photon driving and dissipation. The system displays a critical behavior similar to that of a quantum Ising model at finite temperature. Using the corner-space renormalization method, we compute the steady-state properties of finite...

[Phys. Rev. Lett. 122, 110405] Published Thu Mar 21, 2019

]]>We propose a novel strategy to reconstruct the quantum state of dark systems, i.e., degrees of freedom that are not directly accessible for measurement or control. Our scheme relies on the quantum control of a two-level probe that exerts a state-dependent potential on the dark system. Using a sequen...

[Phys. Rev. Lett. 122, 110406] Published Thu Mar 21, 2019

]]>We explore a conformal field theoretic interpretation of the holographic entanglement of purification, which is defined as the minimal area of the entanglement wedge cross section. We argue that, in ${\mathrm{AdS}}_{3}/{\mathrm{CFT}}_{2}$, the holographic entanglement of purification agrees with the entanglement entropy for a pu...

[Phys. Rev. Lett. 122, 111601] Published Thu Mar 21, 2019

]]>We revisit Weyl invariance string theories in generalized supergravity backgrounds. A possible counterterm was constructed in a work by Sakamoto, Sakatani, and Yoshida, but it seems to be a point of controversy in some literatures whether or not it is nonlocal. To settle down this issue, we show tha...

[Phys. Rev. Lett. 122, 111602] Published Thu Mar 21, 2019

]]>The viscosity of solvation structures is crucial for the development of energy-efficient biofunctional and electrochemical devices. Elucidating their subnanoscale distributions can cause the formation of a sustainable energy society. Here, we visualize the site-specific three-dimensional damping dis...

[Phys. Rev. Lett. 122, 116001] Published Thu Mar 21, 2019

]]>We report inelastic He atom scattering measurements of the (001) surface phonon dispersion of the topological crystalline insulator ${\mathrm{Pb}}_{0.7}{\mathrm{Sn}}_{0.3}\mathrm{Se}$. This material exhibits a temperature-dependent topological transition, so we measure the surface dispersion curves in both the trivial and nontrivial phas...

[Phys. Rev. Lett. 122, 116101] Published Thu Mar 21, 2019

]]>Penetration capacitance measurements of screening efficiencies allows for the mapping of a precise temperature versus filling phase diagram for the melting of Wigner crystals.

[Phys. Rev. Lett. 122, 116601] Published Thu Mar 21, 2019

]]>In the emerging field of magnonics, spin waves are foreseen as signal carriers for future spintronic information processing and communication devices, owing to both the very low power losses and a high device miniaturization potential predicted for short-wavelength spin waves. Yet, the efficient exc...

[Phys. Rev. Lett. 122, 117202] Published Thu Mar 21, 2019

]]>Tailoring Gilbert damping of metallic ferromagnetic thin films is one of the central interests in spintronics applications. Here we report a giant Gilbert damping anisotropy in epitaxial ${\mathrm{Co}}_{50}{\mathrm{Fe}}_{50}$ thin films with a maximum-minimum damping ratio of 400%, determined by broadband spin-torque ferromagnet...

[Phys. Rev. Lett. 122, 117203] Published Thu Mar 21, 2019

]]>We use inelastic neutron scattering to study energy and wave vector dependence of spin fluctuations in ${\mathrm{SrCo}}_{2}{\mathrm{As}}_{2}$, derived from ${\mathrm{SrFe}}_{2-x}{\mathrm{Co}}_{x}{\mathrm{As}}_{2}$ iron pnictide superconductors. Our data reveal the coexistence of antiferromagnetic (AF) and ferromagnetic (FM) spin fluctuations at wave vectors ${\mathbf{Q}}_{\mathrm{AF}}=(1,0)$ and ${\mathbf{...}}_{}$

[Phys. Rev. Lett. 122, 117204] Published Thu Mar 21, 2019

]]>The jerky dynamics of domain walls driven by applied magnetic fields in disordered ferromagnets—the Barkhausen effect—is a paradigmatic example of crackling noise. We study Barkhausen noise in disordered $\mathrm{Pt}/\mathrm{Co}/\mathrm{Pt}$ thin films due to precessional motion of domain walls using full micromagnetic simulati...

[Phys. Rev. Lett. 122, 117205] Published Thu Mar 21, 2019

]]>We study two-dimensional hexagonal photonic lattices of silicon Mie resonators with a topological optical band structure in the visible spectral range. We use 30 keV electrons focused to nanoscale spots to map the local optical density of states in topological photonic lattices with deeply subwavele...

[Phys. Rev. Lett. 122, 117401] Published Thu Mar 21, 2019

]]>Topological quantum and classical materials can exhibit robust properties that are protected against disorder, for example, for noninteracting particles and linear waves. Here, we demonstrate how to construct topologically protected states that arise from the combination of strong interactions and t...

[Phys. Rev. Lett. 122, 118001] Published Thu Mar 21, 2019

]]>We study the effect of correlations in generation times on the dynamics of population growth of microorganisms. We show that any nonzero correlation that is due to cell-size regulation, no matter how small, induces long-term oscillations in the population growth rate. The population only reaches its...

[Phys. Rev. Lett. 122, 118101] Published Thu Mar 21, 2019

]]>By inducing a Raman transition using a pair of Gaussian and Laguerre-Gaussian laser beams, we realize a ${}^{87}\mathrm{Rb}$ condensate whose orbital angular momentum (OAM) and its internal spin states are coupled. By varying the detuning and the coupling strength of the Raman transition, we experimentally map out ...

[Phys. Rev. Lett. 122, 110402] Published Wed Mar 20, 2019

]]>Experimentalists realize a Bose-Einstein condensate on a 2D quasicrystal optical lattice, opening the path for simulations of a variety of quantum many-body phenomena in these fractal structures.

[Phys. Rev. Lett. 122, 110404] Published Wed Mar 20, 2019

]]>Twelve superconducting qubits are entangled, forming a linear cluster state, by using a carefully calibrated sequence of single and 2-qubit quantum gates.

[Phys. Rev. Lett. 122, 110501] Published Wed Mar 20, 2019

]]>Experiments demonstrate a quantum-coherence-induced power increase for quantum heat engines over their classical counterparts.

[Phys. Rev. Lett. 122, 110601] Published Wed Mar 20, 2019

]]>By measuring the transmission of near-resonant light through an atomic vapor confined in a nanocell we demonstrate a mesoscopic optical response arising from the nonlocality induced by the motion of atoms with a phase coherence length larger than the cell thickness. Whereas conventional dispersion t...

[Phys. Rev. Lett. 122, 113401] Published Wed Mar 20, 2019

]]>Suspended particles can alter the properties of fluids and in particular also affect the transition from laminar to turbulent flow. An earlier study [Matas *et al.*, Phys. Rev. Lett. **90**, 014501 (2003)] reported how the subcritical (i.e., hysteretic) transition to turbulent puffs is affected by the add...

[Phys. Rev. Lett. 122, 114502] Published Wed Mar 20, 2019

]]>Materials with a coexistence of magnetic and ferroelectric order (i.e., multiferroics) provide an efficient route for the control of magnetism by electric fields. Unfortunately, a long-sought room temperature multiferroic with strongly coupled ferroelectric and ferromagnetic (or ferrimagnetic) order...

[Phys. Rev. Lett. 122, 117601] Published Wed Mar 20, 2019

]]>If the strong coupling is promoted to a dynamical field-dependent quantity, it is possible that the strong force looked very different in the early Universe. We consider a scenario in which the dynamics is such that QCD confines at high temperatures with a large dynamical scale, relaxing back to $\sim 1\text{\hspace{0.17em}}\text{...}$

[Phys. Rev. Lett. 122, 112001] Published Tue Mar 19, 2019

]]>Sophisticated Ramsey-based interrogation protocols using composite laser pulse sequences have been recently proposed to provide next-generation high-precision atomic clocks with a near perfect elimination of frequency shifts induced during the atom-probing field interaction. We propose here a simple...

[Phys. Rev. Lett. 122, 113601] Published Tue Mar 19, 2019

]]>A new device removes the time-energy correlation or energy chirp on a plasma wakefield, reducing the overall energy spread of the beam.

[Phys. Rev. Lett. 122, 114801] Published Tue Mar 19, 2019

]]>We introduce an experimental test for ruling out classical explanations for the statistics obtained when measuring arbitrary observables at arbitrary times using individual detectors. This test requires some trust in the measurements, represented by a few natural assumptions on the detectors. In qua...

[Phys. Rev. Lett. 122, 110401] Published Mon Mar 18, 2019

]]>The flow in an evaporating glycerol-water binary submillimeter droplet with a Bond number $\mathrm{Bo}\ll 1$ is studied both experimentally and numerically. First, we measure the flow fields near the substrate by microparticle image velocimetry for both sessile and pendant droplets during the evaporation process,...

[Phys. Rev. Lett. 122, 114501] Published Mon Mar 18, 2019

]]>Tokamak experiments show that confining the plasma in an elongated inverse D-shape could reduce energy transport at reactor-relevant plasma pressure without disruptive instabilities.

[Phys. Rev. Lett. 122, 115001] Published Mon Mar 18, 2019

]]>Calculations uncover the neutron-scattering signature of the magnetic monopoles that propagate through quantum spin ices.

[Phys. Rev. Lett. 122, 117201] Published Mon Mar 18, 2019

]]>Quantum state tomography is both a crucial component in the field of quantum information and computation and a formidable task that requires an incogitable number of measurement configurations as the system dimension grows. We propose and experimentally carry out an intuitive adaptive compressive to...

[Phys. Rev. Lett. 122, 100404] Published Fri Mar 15, 2019

]]>We report the first implementation of the von Neumann instantaneous measurements of nonlocal variables, which becomes possible due to technological achievements in creating hyperentangled photons. Tests of reliability and of the nondemolition property of the measurements have been performed with hig...

[Phys. Rev. Lett. 122, 100405] Published Fri Mar 15, 2019

]]>The cross section of the process ${e}^{+}{e}^{-}\to {\pi}^{+}{D}^{0}{D}^{*-}$ for center-of-mass energies from 4.05 to 4.60 GeV is measured precisely using data samples collected with the BESIII detector operating at the BEPCII storage ring. Two enhancements are clearly visible in the cross section around 4.23 and 4.40 GeV. Using ...

[Phys. Rev. Lett. 122, 102002] Published Fri Mar 15, 2019

]]>Above-barrier complete fusion involving nuclides with low binding energy is typically suppressed by 30%. The mechanism that causes this suppression, and produces the associated incomplete fusion products, is controversial. We have developed a new experimental approach to investigate the mechanisms t...

[Phys. Rev. Lett. 122, 102501] Published Fri Mar 15, 2019

]]>High precision determination of the molecular hydrogen dissociation energy is now sensitive to the finite size of the proton.

[Phys. Rev. Lett. 122, 103002] Published Fri Mar 15, 2019

]]>The quantum electrodynamic correction to the energy of the hydrogen molecule has been evaluated without expansion in the electron-proton mass ratio. The obtained results significantly improve the accuracy of theoretical predictions reaching the level of 1 MHz for the dissociation energy, in very goo...

[Phys. Rev. Lett. 122, 103003] Published Fri Mar 15, 2019

]]>An hourglass nodal line observed in a nonsymmorphic photonic crystal is immune to symmetry preserving perturbation and provides an ideal robust platform for photonic applications.

[Phys. Rev. Lett. 122, 103903] Published Fri Mar 15, 2019

]]>Zonal flow appears in toroidal, magnetically confined plasmas as part of the self-regulated interaction of turbulence and transport processes. For toroidal plasmas having a strong toroidal magnetic field, the zonal flow is predominately poloidally directed. This Letter reports the first observation ...

[Phys. Rev. Lett. 122, 105001] Published Fri Mar 15, 2019

]]>A thunderstorm probed with atmospheric muons had an electric potential exceeding one billion volts, much higher than values measured previously.

[Phys. Rev. Lett. 122, 105101] Published Fri Mar 15, 2019

]]>The angles at which flat bands emerge to produce superconductivity in twisted bilayer graphene are shown to be fundamentally connected to quantum Hall wave functions.

[Phys. Rev. Lett. 122, 106405] Published Fri Mar 15, 2019

]]>We provide evidence for spin-triplet electron pairing in proximity-induced superconductivity in a ferromagnetic semiconductor (In,Fe)As. As discovered in half-metallic materials, an extraordinarily long proximity range is observed. More surprising is a very strong concentration of supercurrent to th...

[Phys. Rev. Lett. 122, 107001] Published Fri Mar 15, 2019

]]>${\mathrm{GaV}}_{4}{\mathrm{S}}_{8}$ is a multiferroic semiconductor hosting magnetic cycloid (Cyc) and Néel-type skyrmion lattice (SkL) phases with a broad region of thermal and magnetic stability. Here, we use time-resolved magneto-optical Kerr spectroscopy to show the coherent generation of collective spin excitations in the ...

[Phys. Rev. Lett. 122, 107203] Published Fri Mar 15, 2019

]]>We demonstrate amplification of longitudinal optical (LO) phonons by polar-optical interaction with an electron plasma in a GaAs structure coupled to a metallic metasurface using two-color two-dimensional spectroscopy. In a novel scheme, the metamaterial resonator enhances broadband terahertz fields...

[Phys. Rev. Lett. 122, 107402] Published Fri Mar 15, 2019

]]>We investigated the dynamics of polymer-grafted gold nanoparticles loaded into polymer melts using x-ray photon correlation spectroscopy. For low molecular weight host matrix polymer chains, normal isotropic diffusion of the gold nanoparticles is observed. For larger molecular weights, anomalous dif...

[Phys. Rev. Lett. 122, 107802] Published Fri Mar 15, 2019

]]>Collections of bidisperse frictionless particles at zero temperature in three dimensions are simulated with a shear-driven dynamics with the aim to compare with the behavior in two dimensions. Contrary to the prevailing picture, and in contrast to results from isotropic jamming from compression or q...

[Phys. Rev. Lett. 122, 108003] Published Fri Mar 15, 2019

]]>Extinction is the ultimate absorbing state of any stochastic birth-death process; hence, the time to extinction is an important characteristic of any natural population. Here we consider logistic and logisticlike systems under the combined effect of demographic and bounded environmental stochasticit...

[Phys. Rev. Lett. 122, 108102] Published Fri Mar 15, 2019

]]>Using a large database of 8 million institutional trades executed in the U.S. equity market, we establish a clear crossover between a linear market impact regime and a square-root regime as a function of the volume of the order. Our empirical results are remarkably well explained by a recently propo...

[Phys. Rev. Lett. 122, 108302] Published Fri Mar 15, 2019

]]>Researchers test a key element of the theory of gravity in the strongest gravitational field to date—that produced by the supermassive black hole at the center of the Milky Way.

[Phys. Rev. Lett. 122, 101102] Published Thu Mar 14, 2019

]]>Entanglement suppression in the strong-interaction $S$ matrix is shown to be correlated with approximate spin-flavor symmetries that are observed in low-energy baryon interactions, the Wigner $SU(4)$ symmetry for two flavors and an $SU(16)$ symmetry for three flavors. We conjecture that dynamical entangle...

[Phys. Rev. Lett. 122, 102001] Published Thu Mar 14, 2019

]]>Raman optical activity underpins a powerful vibrational spectroscopic technique for obtaining detailed structural information about chiral molecular species. The effect centers on the discriminatory interplay between the handedness of material chirality with that of circularly polarized light. Twist...

[Phys. Rev. Lett. 122, 103201] Published Thu Mar 14, 2019

]]>Weyl points (WPs), as the doubly degenerate points in three-dimensional momentum band structures, carry quantized topological charges and give rise to a variety of extraordinary properties, such as robust surface wave and chiral anomaly. Type-II Weyl semimetals, which have conical dispersions in Fer...

[Phys. Rev. Lett. 122, 104302] Published Thu Mar 14, 2019

]]>A drop bouncing on a liquid stores information in a wave and rereads it later.

[Phys. Rev. Lett. 122, 104303] Published Thu Mar 14, 2019

]]>We propose a novel scheme for frequency-tunable subcycle electromagnetic pulse generation. To this end a pump electron beam is injected into an electromagnetic seed pulse as the latter is reflected by a mirror. The electron beam is shown to be able to amplify the field of the seed pulse while upshif...

[Phys. Rev. Lett. 122, 104803] Published Thu Mar 14, 2019

]]>By using exact quantum Monte Carlo methods we calculate the ground-state properties of the liquid phase in one-dimensional Bose mixtures with contact interactions. We find that the liquid state can be formed if the ratio of coupling strengths between interspecies attractive and intraspecies repulsiv...

[Phys. Rev. Lett. 122, 105302] Published Thu Mar 14, 2019

]]>Using density functional theory calculations, we investigate the origin of the insulating phase and metal-insulator transition (MIT) in octahedral tantalum disulfide ($1T\text{\u2212}{\mathrm{TaS}}_{2}$), a layered van der Waals material with a prominent two-dimensional (2D) charge density wave (CDW) order. We show that the MI...

[Phys. Rev. Lett. 122, 106404] Published Thu Mar 14, 2019

]]>The moiré pattern created by the epitaxy of a graphene sheet on an iridium substrate can be used as a template for the growth of 2D atomic or cluster arrays. We observed for the first time a coherent organization of hard magnetic preformed FePt nanoparticles on the 2D lattice of graphene on Ir(111)....

[Phys. Rev. Lett. 122, 106802] Published Thu Mar 14, 2019

]]>We consider the one-dimensional (1D) topological superconductor that may form in a planar superconductor-metal-superconductor Josephson junction in which the metal is subjected to spin-orbit coupling and to an in-plane magnetic field. This 1D topological superconductor has been the subject of recent...

[Phys. Rev. Lett. 122, 107701] Published Thu Mar 14, 2019

]]>We report on an extensive study of the elastic scattering time ${\tau}_{s}$ of matter waves in optical disordered potentials. Using direct experimental measurements, numerical simulations, and comparison with the first-order Born approximation based on the knowledge of the disorder properties, we explore the ...

[Phys. Rev. Lett. 122, 100403] Published Wed Mar 13, 2019

]]>Sensing static magnetic fields with high sensitivity and spatial resolution is critical to many applications in fundamental physics, bioimaging, and materials science. Even more beneficial would be full vector magnetometry with nanoscale spatial resolution. Several versatile magnetometry platforms h...

[Phys. Rev. Lett. 122, 100501] Published Wed Mar 13, 2019

]]>Precision results on cosmic-ray electrons are presented in the energy range from 0.5 GeV to 1.4 TeV based on $28.1\times {10}^{6}$ electrons collected by the Alpha Magnetic Spectrometer on the International Space Station. In the entire energy range the electron and positron spectra have distinctly different magn...

[Phys. Rev. Lett. 122, 101101] Published Wed Mar 13, 2019

]]>We propose a mechanism to generate primordial black holes (PBHs) that is independent of cosmological inflation and occurs slightly below the QCD phase transition. Our setup relies on the collapse of long-lived string-domain wall networks and is naturally realized in QCD axion models with domain wall...

[Phys. Rev. Lett. 122, 101301] Published Wed Mar 13, 2019

]]>Recently the bound on the Lyapunov exponent ${\lambda}_{L}\le 2\pi T/\hslash $ in thermal quantum systems was conjectured by Maldacena, Shenker, and Stanford. If we naïvely apply this bound to a system with a fixed Lyapunov exponent ${\lambda}_{L}$, it might predict the existence of the lower bound on temperature $T\ge \hslash {\lambda}_{L}/2\pi $. Particularly, ...

[Phys. Rev. Lett. 122, 101603] Published Wed Mar 13, 2019

]]>Wave sources moving faster than the waves they emit create a wake whose topological features are directly related to the geometry of the source trajectory. These features can be understood by considering space-time surfaces representing past emitted wave fronts. Specifically, for a supervelocity sou...

[Phys. Rev. Lett. 122, 104301] Published Wed Mar 13, 2019

]]>Simulations reveal that nanometer-scale droplets merge via a zipping-like action initiated by molecular-sized waves on their surfaces.

[Phys. Rev. Lett. 122, 104501] Published Wed Mar 13, 2019

]]>We show that the spin-orbit coupling (SOC) in $\alpha $-MnTe impacts the transport behavior by generating an anisotropic valence-band splitting, resulting in four spin-polarized pockets near $\mathrm{\Gamma}$. A minimal $k\xb7p$ model is constructed to capture this splitting by group theory analysis, a tight-binding model, and *...*

[Phys. Rev. Lett. 122, 106602] Published Wed Mar 13, 2019

]]>Inelastic electron tunneling spectroscopy (IETS) with the scanning tunneling microscope (STM) is a powerful technique used to characterize the vibration and spin states at the single-molecule level. While IETS lacks hard selection rules, historically it has been assumed that vibrational overtones ar...

[Phys. Rev. Lett. 122, 106801] Published Wed Mar 13, 2019

]]>Using density functional theory and Monte Carlo calculations, we study the thickness dependence of the magnetic and electronic properties of a van der Waals interlayer antiferromagnet in the two-dimensional limit. Considering ${\mathrm{MnBi}}_{2}{\mathrm{Te}}_{4}$ as a model material, we find it to demonstrate a remarkable set o...

[Phys. Rev. Lett. 122, 107202] Published Wed Mar 13, 2019

]]>Resonant scattering of weak coherent laser pulses on a single two-level system realized in a semiconductor quantum dot is investigated with respect to a time delay between incoming and scattered light. This type of time delay was predicted by Wigner in 1955 for purely coherent scattering and was con...

[Phys. Rev. Lett. 122, 107401] Published Wed Mar 13, 2019

]]>An achiral, bent-core mesogen forms several tilted smectic liquid crystal phases, including a nonpolar, achiral de Vries smectic $A$ which transitions to a chiral, ferroelectric state in applied electric fields above a threshold. At lower temperature, a chiral, ferrielectric phase with a periodic, sup...

[Phys. Rev. Lett. 122, 107801] Published Wed Mar 13, 2019

]]>We study experimentally the origin of heterogeneous dynamics in strongly driven glass-forming systems. Thereto, we apply a well-defined force with a laser line trap on individual colloidal polystyrene probe particles seeded in an emulsion glass composed of droplets of the same size. Fluid and glass ...

[Phys. Rev. Lett. 122, 108002] Published Wed Mar 13, 2019

]]>Autonomous implantable bioelectronics requires efficient radiating structures for data transfer and wireless powering. The radiation of body-implanted capsules is investigated to obtain the explicit radiation optima for $\mathbf{E}$- and $\mathbf{B}$-coupled sources of arbitrary dimensions and properties. The analysis us...

[Phys. Rev. Lett. 122, 108101] Published Wed Mar 13, 2019

]]>Energy-time uncertainty plays an important role in quantum foundations and technologies, and it was even discussed by the founders of quantum mechanics. However, standard approaches (e.g., Robertson’s uncertainty relation) do not apply to energy-time uncertainty because, in general, there is no Herm...

[Phys. Rev. Lett. 122, 100401] Published Tue Mar 12, 2019

]]>We propose a simple and efficient method for generating metrologically useful quantum entanglement in an ensemble of spin-1 atoms that interacts with a high-finesse optical cavity mode. It requires straightforward preparation of $N$ atoms in the ${m}_{F}=0$ sublevel, tailoring of the atom-field interaction t...

[Phys. Rev. Lett. 122, 103601] Published Tue Mar 12, 2019

]]>We show that Kerr beam self-cleaning results from parametric mode mixing instabilities that generate a number of nonlinearly interacting modes with randomized phases—optical wave turbulence, followed by a direct and inverse cascade towards high mode numbers and condensation into the fundamental mode...

[Phys. Rev. Lett. 122, 103902] Published Tue Mar 12, 2019

]]>An array of silicon pillars could focus and confine an electron beam in future computer-chip-sized electron accelerators, allowing faster acceleration of electrons using this technology.

[Phys. Rev. Lett. 122, 104801] Published Tue Mar 12, 2019

]]>The stretching exponent of the mechanical relaxation spectrum is spatially homogeneous, as shown by molecular dynamics simulations.

[Phys. Rev. Lett. 122, 105501] Published Tue Mar 12, 2019

]]>We show that aperiodic superlattices exhibit intriguing interplay between phononic coherent wave interference effects and incoherent transport. In particular, broadband Anderson localization results in a drastic thermal conductivity reduction of 98% at room temperature, providing an ultralow value o...

[Phys. Rev. Lett. 122, 105901] Published Tue Mar 12, 2019

]]>We investigate the finite-size scaling of the boundary quantum geometric tensor (QGT) numerically close to the Anderson localization transition in the presence of small external magnetic fields. The QGT exhibits universal scaling and reveals the crossover between the orthogonal and unitary critical ...

[Phys. Rev. Lett. 122, 106601] Published Tue Mar 12, 2019

]]>We demonstrate many-body multifractality of the Bose-Hubbard Hamiltonian’s ground state in Fock space, for arbitrary values of the interparticle interaction. Generalized fractal dimensions unambiguously signal, even for small system sizes, the emergence of a Mott insulator that cannot, however, be n...

[Phys. Rev. Lett. 122, 106603] Published Tue Mar 12, 2019

]]>Bootstrap, or $k$-core, percolation displays on the Bethe lattice a mixed first- and second-order phase transition with both a discontinuous order parameter and diverging critical fluctuations. I apply the recently introduced $M$-layer technique to study corrections to mean-field theory showing that at ...

[Phys. Rev. Lett. 122, 108301] Published Tue Mar 12, 2019

]]>We introduce a spinorial version of the scattering equations, the polarized scattering equations, that incorporates spinor polarization data. They underpin new formulas for tree-level scattering amplitudes in six dimensions that directly extend to maximal supersymmetry. We find new ingredients for i...

[Phys. Rev. Lett. 122, 101601] Published Mon Mar 11, 2019

]]>In this Letter, we suggest a natural spinor-helicity formalism for massless fields in four-dimensional anti–de Sitter space (${\mathrm{AdS}}_{4}$). It is based on the standard realization of the ${\mathrm{AdS}}_{4}$ isometry algebra $so(3,2)$ in terms of differential operators acting on $sl(2,\mathbb{C})$ spinor variables. We start by deriving...

[Phys. Rev. Lett. 122, 101602] Published Mon Mar 11, 2019

]]>Ultralong-range Rydberg trimer molecules are spectroscopically observed in an ultracold gas of $\mathrm{Cs}(n{d}_{3/2})$ atoms. The anisotropy of the atomic Rydberg state allows for the formation of angular trimers, whose energies may not be obtained from integer multiples of dimer energies. These nonadditive trime...

[Phys. Rev. Lett. 122, 103001] Published Mon Mar 11, 2019

]]>3D maps of a sample’s refractive index—used in some biomedical tests—can be directly derived from angle-dependent measurements of light scattering from the sample.

[Phys. Rev. Lett. 122, 103901] Published Mon Mar 11, 2019

]]>