Researchers engineered semiconductor systems that sustain exotic phases of matter.

[Phys. Rev. Lett. 123, 043201] Published Tue Jul 23, 2019

]]>It is commonly accepted that the magnitude of a photoelectron circular dichroism (PECD) is governed by the ability of an outgoing photoelectron wave packet to probe the chiral asymmetry of a molecule. To be able to accumulate this characteristic asymmetry while escaping the chiral ion, photoelectron...

[Phys. Rev. Lett. 123, 043202] Published Tue Jul 23, 2019

]]>Light is an essential tool for connections between quantum devices and for diagnostic processes in quantum technology. Both applications deal with advanced nonclassical states beyond Gaussian coherent and squeezed states. Current development requires a loss-tolerant diagnostic of such nonclassical a...

[Phys. Rev. Lett. 123, 043601] Published Tue Jul 23, 2019

]]>We analyze a cavity optomechanical setup, in which the position of an oscillator modulates the internal optical loss. We show that, in contrast to systems with a fixed internal loss, in such a setup, quantum-limited position measurements can be performed and formulate conditions under which it is po...

[Phys. Rev. Lett. 123, 043602] Published Tue Jul 23, 2019

]]>We show that optical beams propagating in transversally disordered materials exhibit a spin Hall effect and a spin-to-orbital conversion of angular momentum as they deviate from paraxiality. We theoretically describe these phenomena on the basis of the microscopic statistical approach to light propa...

[Phys. Rev. Lett. 123, 043901] Published Tue Jul 23, 2019

]]>Superradiant gain is the process in which waves are amplified via their interaction with a rotating body, examples including the evaporation of a spinning black hole and electromagnetic emission from a rotating metal sphere. In this Letter we elucidate how superradiance may be realized experimentall...

[Phys. Rev. Lett. 123, 044301] Published Tue Jul 23, 2019

]]>The interaction rate of a charged particle beam with the atomic nuclei of a target varies significantly if the target has a crystalline structure. In particular, under specific orientations of the target with respect to the incident beam, the probability of inelastic interaction with nuclei can be e...

[Phys. Rev. Lett. 123, 044801] Published Tue Jul 23, 2019

]]>Understanding the local atomic order in amorphous thin film coatings and how it relates to macroscopic performance factors, such as mechanical loss, provides an important path towards enabling the accelerated discovery and development of improved coatings. High precision x-ray scattering measurement...

[Phys. Rev. Lett. 123, 045501] Published Tue Jul 23, 2019

]]>A general theory of quantum electrodynamics shows that translational symmetry can be restored for Bloch electrons in a homogeneous magnetic field by including its fluctuations.

[Phys. Rev. Lett. 123, 047202] Published Tue Jul 23, 2019

]]>The recent discovery of intrinsic ferromagnetic order in the atomically thin van der Waals crystal $\mathrm{Cr}X{\mathrm{Te}}_{3}$ ($X=\mathrm{Si}$, Ge) stimulates intensive studies on the nature of low-dimensional magnetism because the presence of long-range magnetic order in two-dimensional systems with continuous symmetry is strict...

[Phys. Rev. Lett. 123, 047203] Published Tue Jul 23, 2019

]]>The self-trapping of exciton-polariton condensates is demonstrated and explained by the formation of a new polaronlike state. Above the polariton lasing threshold, local variation of the lattice temperature provides the mechanism for an attractive interaction between polaritons. Because of this attr...

[Phys. Rev. Lett. 123, 047401] Published Tue Jul 23, 2019

]]>In the classical domain, it is well known that divisibility does not imply that a stochastic process is Markovian. However, for quantum processes, divisibility is often considered to be synonymous with Markovianity. We show that completely positive divisible quantum processes can still involve non-M...

[Phys. Rev. Lett. 123, 040401] Published Mon Jul 22, 2019

]]>We consider the quench dynamics of a two-dimensional quantum dimer model and determine the role of its kinematic constraints. We interpret the nonequilibrium dynamics in terms of the underlying equilibrium phase transitions consisting of a Berezinskii-Kosterlitz-Thouless (BKT) transition between a c...

[Phys. Rev. Lett. 123, 040601] Published Mon Jul 22, 2019

]]>A new optical spectroscopy method can characterize the chemical composition of different layers of the material ejected from type Ia supernovae, delivering clues to the star’s history.

[Phys. Rev. Lett. 123, 041101] Published Mon Jul 22, 2019

]]>Charged-particle fragmentation functions for jets azimuthally balanced by a high-transverse-momentum, prompt, isolated photon are measured in $25\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{pb}}^{-1}$ of $pp$ and $0.49\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{nb}}^{-1}$ of $\mathrm{Pb}+\mathrm{Pb}$ collision data at 5.02 TeV per nucleon pair recorded with the ATLAS detector at the Large Hadron Collider. The measurem...

[Phys. Rev. Lett. 123, 042001] Published Mon Jul 22, 2019

]]>The observed correlation between the EMC effect and the contribution of short-range correlations (SRCs) in nuclei suggests that the modification of the quark distributions of bound protons and neutrons might occur within SRCs. This raises the possibility that the EMC effect may have an isospin depen...

[Phys. Rev. Lett. 123, 042501] Published Mon Jul 22, 2019

]]>In condensed matter physics many features can be understood in terms of their topological properties. Here we report evidence of a topological quantum transition driven by the charge-phonon coupling in the spinless Haldane model on a honeycomb lattice, a well-known prototypical model of the Chern in...

[Phys. Rev. Lett. 123, 046401] Published Mon Jul 22, 2019

]]>In magnetically doped thin-film topological insulators, aligning the magnetic moments generates a quantum anomalous Hall phase supporting a single chiral edge state. We show that as the system demagnetizes, disorder from randomly oriented magnetic moments can produce a “quantum anomalous parity Hall...

[Phys. Rev. Lett. 123, 046801] Published Mon Jul 22, 2019

]]>The $n$-type ${\text{HgCr}}_{2}{\mathrm{Se}}_{4}$ exhibits a sharp semiconductor-to-metal transition (SMT) in resistivity accompanying the ferromagnetic order at ${T}_{C}=106\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{K}$. Here, we investigate the effects of pressure and magnetic field on the concomitant SMT and ferromagnetic order by measuring resistivity, dc and ac magnetic s...

[Phys. Rev. Lett. 123, 047201] Published Mon Jul 22, 2019

]]>Using controlled gate training, the scattering lengths in HgTe edge channels can be extended by an order of magnitude, opening up the feasibility of macroscopic applications.

[Phys. Rev. Lett. 123, 047701] Published Mon Jul 22, 2019

]]>Benchmarking methods that can be adapted to multiqubit systems are essential for assessing the overall or “holistic” performance of nascent quantum processors. The current industry standard is Clifford randomized benchmarking (RB), which measures a single error rate that quantifies overall performan...

[Phys. Rev. Lett. 123, 030503] Published Fri Jul 19, 2019

]]>A pair of satellites 200 km apart has demonstrated a record-high precision in distance determination, which will be useful for mapping out Earth’s gravitational field.

[Phys. Rev. Lett. 123, 031101] Published Fri Jul 19, 2019

]]>We show that a parity-breaking *uniform* (averaged over all directions on the sky) circular polarization of amplitude ${V}_{00}\simeq 2.6\times {10}^{-17}\mathrm{\Delta}\chi (r/0.06)$ can be induced by a chiral gravitational-wave (GW) background with a tensor-to-scalar ratio $r$ and chirality parameter $\mathrm{\Delta}\chi $ (which is $\pm 1$ for a maximally chiral bac...

[Phys. Rev. Lett. 123, 031305] Published Fri Jul 19, 2019

]]>The AdS/CFT correspondence is used to show that response functions of quantum field theories can be used to “image” the black holes of the field theory’s gravitational duals.

[Phys. Rev. Lett. 123, 031602] Published Fri Jul 19, 2019

]]>We present a novel data-driven method for determining the hadronic interaction strengths of axionlike particles (ALPs) with QCD-scale masses. Using our method, it is possible to calculate the hadronic production and decay rates of ALPs, along with many of the largest ALP decay rates to exclusive fin...

[Phys. Rev. Lett. 123, 031803] Published Fri Jul 19, 2019

]]>Scalable quantum photonic networks require coherent excitation of quantum emitters. However, many solid-state systems can undergo a transition to a dark shelving state that inhibits the resonance fluorescence. Here, we demonstrate that by a controlled gating using a weak nonresonant laser, the reson...

[Phys. Rev. Lett. 123, 033602] Published Fri Jul 19, 2019

]]>Strong optical forces with minimal spontaneous emission are desired for molecular deceleration and atom interferometry applications. We report experimental benchmarking of such a stimulated optical force driven by ultrafast laser pulses. We apply this technique to accelerate atoms, demonstrating up ...

[Phys. Rev. Lett. 123, 033603] Published Fri Jul 19, 2019

]]>Vortex shedding is an oscillating flow that is commonly observed in fluids due to the presence of a blunt body in a flowing medium. Numerical simulations have shown that the phenomenon of vortex shedding could also develop in the magnetohydrodynamic (MHD) domain. The dimensionless Strouhal number, t...

[Phys. Rev. Lett. 123, 035102] Published Fri Jul 19, 2019

]]>Spin-1 bosons on a one-dimensional chain, at incommensurate filling with an antiferromagnetic spin interaction between neighboring bosons, may form a spin-1 boson condensed state that contains both a gapless charge and spin excitations. We argue that the spin-1 boson condensed state is unstable, and...

[Phys. Rev. Lett. 123, 035301] Published Fri Jul 19, 2019

]]>Charge density waves (CDWs) are symmetry-broken ground states that commonly occur in low-dimensional metals due to strong electron-electron and/or electron-phonon coupling. The nonequilibrium carrier distribution established via photodoping with femtosecond laser pulses readily quenches these ground...

[Phys. Rev. Lett. 123, 036405] Published Fri Jul 19, 2019

]]>Magnetotransport constitutes a useful probe to understand the interplay between electronic band topology and magnetism in spintronic devices. A recent theory of Lu and Shen [Phys. Rev. Lett. **112**, 146601 (2014)] on magnetically doped topological insulators predicts that quantum corrections $\mathrm{\Delta}\kappa $ to the ...

[Phys. Rev. Lett. 123, 036406] Published Fri Jul 19, 2019

]]>Recent experiments on cold atoms in optical lattices allow for a quantitative comparison of the measurements to the conductivity calculations in the square lattice Hubbard model. However, the available calculations do not give consistent results, and the question of the exact solution for the conduc...

[Phys. Rev. Lett. 123, 036601] Published Fri Jul 19, 2019

]]>The spin $S=\frac{1}{2}$ Kitaev honeycomb model has attracted significant attention since emerging candidate materials have provided a playground to test non-Abelian anyons. The Kitaev model with higher spins has also been theoretically studied, as it may offer another path to a quantum spin liquid. However, a...

[Phys. Rev. Lett. 123, 037203] Published Fri Jul 19, 2019

]]>The exact Kohn-Sham iteration of generalized density-functional theory in finite dimensions with a Moreau-Yosida regularized universal Lieb functional and an adaptive damping step is shown to converge to the correct ground-state density.

[Phys. Rev. Lett. 123, 037401] Published Fri Jul 19, 2019

]]>Competing timescales generate novelty. Here, we show that a coupling between the timescales imposed by instrument inertia and the formation of interparticle frictional contacts in shear-thickening suspensions leads to highly asymmetric shear-rate oscillations. Experiments tuning the presence of osci...

[Phys. Rev. Lett. 123, 038004] Published Fri Jul 19, 2019

]]>Synthesis of biopolymers such as DNA, RNA, and proteins are biophysical processes aided by enzymes. The performance of these enzymes is usually characterized in terms of their average error rate and speed. However, because of thermal fluctuations in these single-molecule processes, both error and sp...

[Phys. Rev. Lett. 123, 038101] Published Fri Jul 19, 2019

]]>The growth, form, and division of prebiotic vesicles, membraneous bags of fluid of varying components and shapes is hypothesized to have served as the substrate for the origin of life. The dynamics of these out-of-equilibrium structures is controlled by physicochemical processes that include the int...

[Phys. Rev. Lett. 123, 038102] Published Fri Jul 19, 2019

]]>We investigate the relaxation dynamics of an interacting Stark-localized system coupled to a dephasing bath, and compare its behavior to the conventional disorder-induced many body localized system. Specifically, we study the dynamics of population imbalance between even and odd sites, and the growt...

[Phys. Rev. Lett. 123, 030602] Published Thu Jul 18, 2019

]]>We introduce a new picture of vacuum decay which, in contrast to existing semiclassical techniques, provides a real-time description and does not rely on classically forbidden tunneling paths. Using lattice simulations, we observe vacuum decay via bubble formation by generating realizations of vacuu...

[Phys. Rev. Lett. 123, 031601] Published Thu Jul 18, 2019

]]>Optical nonreciprocity is of paramount importance to optical signal processing and one-way optical communication. Here, we theoretically and experimentally demonstrate nonreciprocal amplification based on four-level hot atoms by exploiting atomic Doppler shifts. Our approach is simple and easy to im...

[Phys. Rev. Lett. 123, 033902] Published Thu Jul 18, 2019

]]>In this Letter, we report on the effects of a vorticity filament on the coherent backscattering cone. Using ultrasonic waves in a strongly reverberating cavity, we experimentally show that the discrete number of loops of acoustic paths around a pointlike vortex located at the center of the cavity dr...

[Phys. Rev. Lett. 123, 035503] Published Thu Jul 18, 2019

]]>We study one-dimensional clean systems with few channels and strong electron-electron interactions. We find that in several circumstances, even when time-reversal symmetry holds, they may lead to two-terminal fractional quantized conductance and fractional shot noise. The condition on the commensura...

[Phys. Rev. Lett. 123, 036803] Published Thu Jul 18, 2019

]]>The Berry curvature dipole is a physical quantity that is expected to allow various quantum geometrical phenomena in a range of solid-state systems. Monolayer transition metal dichalcogenides provide an exceptional platform to modulate and investigate the Berry curvature dipole through strain. Here,...

[Phys. Rev. Lett. 123, 036806] Published Thu Jul 18, 2019

]]>Building on the mapping of large-$S$ spin chains onto the O(3) nonlinear $\sigma $ model with coupling constant $2/S$, and on general properties of that model (asymptotic freedom, implying that perturbation theory is valid at high energy, and Elitzur’s conjecture that rotationally invariant quantities are infra...

[Phys. Rev. Lett. 123, 037202] Published Thu Jul 18, 2019

]]>In micellar surfactant solutions, changes in the total number of micelles are rare events that can occur by either of two mechanisms—by stepwise association and dissociation via insertion and expulsion of individual molecules or by fission and fusion of entire micelles. Molecular dynamics simulation...

[Phys. Rev. Lett. 123, 038003] Published Thu Jul 18, 2019

]]>[Phys. Rev. Lett. 123, 039901] Published Thu Jul 18, 2019

]]>We show how, upon heating the spin degrees of freedom of the Hubbard model to infinite temperature, the symmetries of the system allow the creation of steady states with long-range correlations between $\eta $ pairs. We induce this heating with either dissipation or periodic driving and evolve the system ...

[Phys. Rev. Lett. 123, 030603] Published Wed Jul 17, 2019

]]>We obtain a new 3D gravity model from two copies of parity-odd Einstein-Cartan theories. Using Hamiltonian analysis, we demonstrate that the only local degrees of freedom are two massive spin-2 modes. Unitarity of the model in anti–de Sitter and Minkowski backgrounds can be satisfied for vast choice...

[Phys. Rev. Lett. 123, 031303] Published Wed Jul 17, 2019

]]>We discuss the use of optical cavities as tools to search for dark matter (DM) composed of virialized ultralight fields (VULFs). Such fields could lead to oscillating fundamental constants, resulting in oscillations of the length of rigid bodies. We propose searching for these effects via differenti...

[Phys. Rev. Lett. 123, 031304] Published Wed Jul 17, 2019

]]>We present a systematic spurion setup called aligned flavor violation (AFV) that allows for new physics couplings to quarks that are aligned with standard model (SM) Yukawa couplings, but do not necessarily share their hierarchies nor are family universal. Additionally, we show that there is an impo...

[Phys. Rev. Lett. 123, 031802] Published Wed Jul 17, 2019

]]>Based on the hypothesis that the $X(3872)$ exotic hadron is a mixture of ${\chi}_{c1}(2P)$ and other states and that its prompt hadroproduction predominately proceeds via its ${\chi}_{c1}(2P)$ component, we calculate the $\mathrm{prompt}\text{\u2212}X(3872)$ polarization at the CERN LHC through next-to-leading order in ${\alpha}_{s}$ within the factorizat...

[Phys. Rev. Lett. 123, 032001] Published Wed Jul 17, 2019

]]>In the past two decades, deeply virtual Compton scattering of electrons has been successfully used to advance our knowledge of the partonic structure of the free proton and investigate correlations between the transverse position and the longitudinal momentum of quarks inside the nucleon. Meanwhile,...

[Phys. Rev. Lett. 123, 032502] Published Wed Jul 17, 2019

]]>We report on the use of parametric excitation to coherently manipulate the collective spin state of an atomic vapor at room temperature. Signatures of the parametric excitation are detected in the ground-state spin evolution. These include the excitation spectrum of the atomic coherences, which cont...

[Phys. Rev. Lett. 123, 033601] Published Wed Jul 17, 2019

]]>Spatial stiffness modulations defined by the sampling of a two-dimensional surface provide one-dimensional elastic lattices with topological properties that are usually attributed to two-dimensional crystals. The cyclic modulation of the stiffness defines a family of lattices whose Bloch eigenmodes ...

[Phys. Rev. Lett. 123, 034301] Published Wed Jul 17, 2019

]]>We develop a comprehensive theoretical model of relativistic collisionless pair shocks mediated by the current filamentation instability. We notably characterize the noninertial frame in which this instability is of a mostly magnetic nature, and describe at a microscopic level the deceleration and h...

[Phys. Rev. Lett. 123, 035101] Published Wed Jul 17, 2019

]]>We have probed the crystalline electric-field ground states of pure $|J=7/2,{J}_{z}=\pm 5/2\u27e9$ as well as the anisotropic $c\text{\u2212}f$ hybridization in both valence fluctuating systems $\alpha $- and $\beta $-${\mathrm{YbAlB}}_{4}$ by linear polarization dependence of angle-resolved core level photoemission spectroscopy. Interestingly, the small but...

[Phys. Rev. Lett. 123, 036404] Published Wed Jul 17, 2019

]]>The interface between the two insulating oxides ${\mathrm{SrTiO}}_{3}$ and ${\mathrm{LaAlO}}_{3}$ gives rise to a two-dimensional electron system with intriguing transport phenomena, including superconductivity, which are controllable by a gate. Previous measurements on the (001) interface have shown that the superconducting criti...

[Phys. Rev. Lett. 123, 036805] Published Wed Jul 17, 2019

]]>Step edges represent a local break of lateral symmetry in ultrathin magnetic films. In our experiments, we investigate the spin coupling across atomic step edges on $\mathrm{Fe}/W(110)$ by means of spin-polarized scanning tunneling microscopy and spectroscopy. Local modifications of the spin texture toward ste...

[Phys. Rev. Lett. 123, 037201] Published Wed Jul 17, 2019

]]>Using first-principles density functional theoretical analysis, we predict coexisting ferroelectric and semimetallic states in a two-dimensional monolayer of h-NbN subjected to an electric field and in-plane strain ($\epsilon $). At strains close to $\epsilon =4.85\%$, where its out-of-plane spontaneous polarization cha...

[Phys. Rev. Lett. 123, 037601] Published Wed Jul 17, 2019

]]>Recent experiments with rotational diffusion of a probe in a vibrated granular media revealed a rich scenario, ranging from a dilute gas to a dense liquid with cage effects and an unexpected superdiffusive behavior at large times. Here we set up a simulation that reproduces quantitatively the experi...

[Phys. Rev. Lett. 123, 038002] Published Wed Jul 17, 2019

]]>ANAIS is a direct detection dark matter experiment aiming at the testing of the DAMA/LIBRA annual modulation result, which, for about two decades, has neither been confirmed nor ruled out by any other experiment in a model independent way. $\mathrm{ANAIS}-112$, consisting of 112.5 kg of sodium iodide crystals,...

[Phys. Rev. Lett. 123, 031301] Published Tue Jul 16, 2019

]]>We present new constraints on the dark matter-induced annual modulation signal using 1.7 years of COSINE-100 data with a total exposure of 97.7 kg yr. The COSINE-100 experiment, consisting of 106 kg of NaI(Tl) target material, is designed to carry out a model-independent test of DAMA/LIBRA’s claim o...

[Phys. Rev. Lett. 123, 031302] Published Tue Jul 16, 2019

]]>We introduce a scheme for deep laser cooling of molecules based on robust dark states at zero velocity. By simulating this scheme, we show it to be a widely applicable method that can reach the recoil limit or below. We demonstrate and characterize the method experimentally, reaching a temperature o...

[Phys. Rev. Lett. 123, 033202] Published Tue Jul 16, 2019

]]>We demonstrate how the combination of oscillating magnetic forces and radio-frequency (rf) pulses endows rf photons with tunable momentum. We observe velocity-selective spin-flip transitions and the associated Doppler shift. Recoil-dressed photons are a promising tool for measurements and quantum si...

[Phys. Rev. Lett. 123, 033203] Published Tue Jul 16, 2019

]]>An electron beam, characterized by a high-angular discrimination ($\simeq 0.7\xb0$), has been used to measure the total (*elastic* plus *inelastic*) cross section of ${\mathrm{H}}_{2}\mathrm{O}$ in the energy range 3–100 eV. Broad coincidence is found with recent experiments, including a pronounced shoulder in the 6–12 eV region. However,...

[Phys. Rev. Lett. 123, 033401] Published Tue Jul 16, 2019

]]>When a multicomponent liquid composed of particles with random interactions is slowly cooled below the freezing temperature, the fluid reorganizes in order to increase (decrease) the number of strong (weak) attractive interactions and solidifies into a structure composed of domains of strongly and o...

[Phys. Rev. Lett. 123, 035502] Published Tue Jul 16, 2019

]]>Particle-hole symmetry dictates that bands at low energy in twisted bilayer graphene are always topological, as long as the lowest two are gapped from the rest.

[Phys. Rev. Lett. 123, 036401] Published Tue Jul 16, 2019

]]>We present an approach to studying optical band gaps in real solids in which quantum Monte Carlo methods allow for the application of a rigorous variational principle to both ground and excited state wave functions. In tests that include small, medium, and large band gap materials, optical gaps are ...

[Phys. Rev. Lett. 123, 036402] Published Tue Jul 16, 2019

]]>We demonstrate the existence of exact atypical many-body eigenstates in a class of disordered, interacting one-dimensional quantum systems that includes the Fermi-Hubbard model as a special case. These atypical eigenstates, which generically have finite energy density and are exponentially many in n...

[Phys. Rev. Lett. 123, 036403] Published Tue Jul 16, 2019

]]>The surface of a higher order topological insulator comprises a two-dimensional topological insulator (TI) with broken inversion symmetry, whose mass is determined by the microscopic details of the surface such as surface potentials and termination. It hosts a helical mode pinned to selected hinges ...

[Phys. Rev. Lett. 123, 036802] Published Tue Jul 16, 2019

]]>The paired top and bottom Dirac surface states, each associated with a half-integer quantum Hall (QH) effect, and a resultant integer QH conductance ($\nu {e}^{2}/h$), are hallmarks of a three-dimensional topological insulator (TI). In a dual-gated system, chemical potentials of the paired surface states are ...

[Phys. Rev. Lett. 123, 036804] Published Tue Jul 16, 2019

]]>Optical tweezers microrheology (OTM) offers a powerful approach to probe the nonlinear response of complex soft matter systems, such as networks of entangled polymers, over wide-ranging spatiotemporal scales. OTM can also uniquely characterize the microstructural dynamics that lead to the intriguing...

[Phys. Rev. Lett. 123, 038001] Published Tue Jul 16, 2019

]]>The generation and distribution of entanglement are key resources in quantum repeater schemes. Temporally multiplexed systems offer time-bin encoding of quantum information which provides robustness against decoherence in fibers, crucial in long distance communication. Here, we demonstrate the direc...

[Phys. Rev. Lett. 123, 030501] Published Mon Jul 15, 2019

]]>Quantum pseudorandomness, also known as unitary designs, comprises a powerful resource for emergent quantum technologies. Although in theory pseudorandom unitary operators can be constructed efficiently, realizing these objects in realistic physical systems is a challenging task. Here, we demonstrat...

[Phys. Rev. Lett. 123, 030502] Published Mon Jul 15, 2019

]]>We introduce a family of nonintegrable 1D lattice models that feature robust periodic revivals under a global quench from certain initial product states, thus generalizing the phenomenon of many-body scarring recently observed in Rydberg atom quantum simulators. Our construction is based on a system...

[Phys. Rev. Lett. 123, 030601] Published Mon Jul 15, 2019

]]>The radiative decay ${\mathrm{\Lambda}}_{b}^{0}\to \mathrm{\Lambda}\gamma $ is observed for the first time using a data sample of proton-proton collisions corresponding to an integrated luminosity of $1.7\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{fb}}^{-1}$ collected by the LHCb experiment at a center-of-mass energy of 13 TeV. Its branching fraction is measured exploiting the ${B}^{0}\to {K}^{*0}\gamma $ decay as a...

[Phys. Rev. Lett. 123, 031801] Published Mon Jul 15, 2019

]]>CUPID-0 is the first pilot experiment of CUPID, a next-generation project for the measurement of neutrinoless double beta decay ($0\nu \mathrm{DBD}$) with scintillating bolometers. The detector, consisting of 24 enriched and 2 natural ZnSe crystals, has been taking data at Laboratori Nazionali del Gran Sasso from...

[Phys. Rev. Lett. 123, 032501] Published Mon Jul 15, 2019

]]>An aluminum ion clock has a fractional-frequency uncertainty of less than one part in ${10}^{18}$, a four-decades-long goal in precision.

[Phys. Rev. Lett. 123, 033201] Published Mon Jul 15, 2019

]]>Spontaneous emission and scattering behavior of an emitter or a resonant scatterer strongly depend on the density of states of the surrounding medium. It has been shown that the resonant scattering cross section (RSC) may diverge at the Weyl frequency of a type I Weyl system due to the diminishing d...

[Phys. Rev. Lett. 123, 033901] Published Mon Jul 15, 2019

]]>The transition from elastic to plastic deformation in crystalline metals shares history dependence and scale-invariant avalanche signature with other nonequilibrium systems under external loading such as colloidal suspensions. These other systems exhibit transitions with clear analogies to work hard...

[Phys. Rev. Lett. 123, 035501] Published Mon Jul 15, 2019

]]>The absence of holelike Fermi pockets in the heavily electron-doped iron selenides (HEDISs) challenges the ${s}_{\pm}$-wave pairing originally proposed for iron pnictides, which consists of opposite signs of the gap function on electron and hole pockets. While the HEDIS compounds have been investigated exten...

[Phys. Rev. Lett. 123, 036801] Published Mon Jul 15, 2019

]]>The brain requires diverse segregated and integrated processing to perform normal functions in terms of anatomical structure and self-organized dynamics with critical features, but the fundamental relationships between the complex structural connectome, critical state, and functional diversity remai...

[Phys. Rev. Lett. 123, 038301] Published Mon Jul 15, 2019

]]>In the presence of conservation laws, superpositions of eigenstates of the corresponding conserved quantities cannot be generated by quantum dynamics. Thus, any such coherence represents a potentially valuable resource of asymmetry, which can be used, for example, to enhance the precision of quantum...

[Phys. Rev. Lett. 123, 020403] Published Fri Jul 12, 2019

]]>Symmetries of both closed- and open-system dynamics imply many significant constraints. These generally have instantiations in both classical and quantum dynamics (Noether’s theorem, for instance, applies to both sorts of dynamics). We here provide an example of such a constraint which has no counte...

[Phys. Rev. Lett. 123, 020404] Published Fri Jul 12, 2019

]]>Three-body recombination in a cold Bose gas reduces entropy, providing a novel way to cool the gas efficiently.

[Phys. Rev. Lett. 123, 020405] Published Fri Jul 12, 2019

]]>Computing marginal distributions of discrete or semidiscrete Markov random fields (MRFs) is a fundamental, generally intractable problem with a vast number of applications in virtually all fields of science. We present a new family of computational schemes to approximately calculate the marginals of...

[Phys. Rev. Lett. 123, 020604] Published Fri Jul 12, 2019

]]>Star clusters surrounding a black hole can undergo an order-disorder phase transition leading to an increase in transient events such as flares from tidally disrupted stars.

[Phys. Rev. Lett. 123, 021103] Published Fri Jul 12, 2019

]]>Liquid droplets bouncing on a vibrating liquid surface can execute a surprising cycle, alternating between moving and standing still.

[Phys. Rev. Lett. 123, 024503] Published Fri Jul 12, 2019

]]>Thermal hysteresis in a phase change material makes it possible to build a radiative thermal memristor, a fast thermal circuit element whose response is dependent on its history.

[Phys. Rev. Lett. 123, 025901] Published Fri Jul 12, 2019

]]>We investigate the electronic structure of a twisted multilayer graphene system forming a moiré pattern. We consider small twist angles separating the graphene sheets and develop a low-energy theory to describe the coupling of Dirac Bloch states close to the $K$ point in each individual plane. Extendi...

[Phys. Rev. Lett. 123, 026402] Published Thu Jul 11, 2019

]]>We report charge transfer and built-in electric fields across the epitaxial ${\mathrm{SrNb}}_{x}{\mathrm{Ti}}_{1-x}{\mathrm{O}}_{3-\delta}/\mathrm{Si}(001)$ interface. Electrical transport measurements indicate the formation of a hole gas in the Si and the presence of built-in fields. Hard x-ray photoelectron measurements reveal pronounced asymmetries in c...

[Phys. Rev. Lett. 123, 026805] Published Thu Jul 11, 2019

]]>Magnetic excitations of the effective spin $S=1/2$ dimerized magnet ${\mathrm{Ba}}_{2}{\mathrm{CoSi}}_{2}{\mathrm{O}}_{6}{\mathrm{Cl}}_{2}$ have been probed directly via inelastic neutron scattering experiments at temperatures down to 4 K. We observed five types of excitation at 4.8, 5.8, 6.6, 11.4, and 14.0 meV, which are all dispersionless within the resol...

[Phys. Rev. Lett. 123, 027206] Published Thu Jul 11, 2019

]]>Physicists develop a theory to make the seemingly random, thermal-driven motion of clumps and colloids in fluids predictable.

[Phys. Rev. Lett. 123, 028002] Published Thu Jul 11, 2019

]]>We revisit a family of integrals that delude intuition and that recently appeared in mathematical literature in connection with computer algebra package verification. We show that the remarkable properties displayed by these integrals become transparent when formulated in the language of random walk...

[Phys. Rev. Lett. 123, 020201] Published Wed Jul 10, 2019

]]>We introduce quantum hypercube states, a class of continuous-variable quantum states that are generated as orthographic projections of hypercubes onto the quadrature phase space of a bosonic mode. In addition to their interesting geometry, hypercube states display phase-space features much smaller t...

[Phys. Rev. Lett. 123, 020402] Published Wed Jul 10, 2019

]]>A new distribution for systems of particles in equilibrium obeying the exclusion of correlated states is presented following Haldane’s state counting. It relies upon an ansatz to deal with the multiple exclusion that takes place when the states accessible to single particles are spatially correlated...

[Phys. Rev. Lett. 123, 020602] Published Wed Jul 10, 2019

]]>We investigate how the presence of a single-particle mobility edge in a system can generate strong energy current rectification. Specifically, we study a quadratic bosonic chain subject to a quasiperiodic potential and coupled at its boundaries to spin baths of differing temperature. We find that re...

[Phys. Rev. Lett. 123, 020603] Published Wed Jul 10, 2019

]]>An interpretation of the black hole image taken by the Event Horizon Telescope hints of new constraints on the mass of dark matter.

[Phys. Rev. Lett. 123, 021102] Published Wed Jul 10, 2019

]]>Primordial magnetic fields (PMFs), being present before the epoch of cosmic recombination, induce small-scale baryonic density fluctuations. These inhomogeneities lead to an inhomogeneous recombination process that alters the peaks and heights of the large-scale anisotropies of the cosmic microwave ...

[Phys. Rev. Lett. 123, 021301] Published Wed Jul 10, 2019

]]>The PHENIX collaboration presents first measurements of low-momentum ($0.4<{p}_{T}<3\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{GeV}/c$) direct-photon yields from $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=39$ and 62.4 GeV. For both beam energies the direct-photon yields are substantially enhanced with respect to expectations from prompt processes, similar to th...

[Phys. Rev. Lett. 123, 022301] Published Wed Jul 10, 2019

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