A precision measurement by AMS of the antiproton flux and the antiproton-to-proton flux ratio in primary cosmic rays in the absolute rigidity range from 1 to 450 GV is presented based on $3.49\times 1{0}^{5}$ antiproton events and $2.42\times 1{0}^{9}$ proton events. The fluxes and flux ratios of charged elementary particles…

[Phys. Rev. Lett. 117, 091103] Published Fri Aug 26, 2016

]]>We study the poles of the retarded Green’s functions of strongly coupled field theories exhibiting a variety of phase structures from a crossover up to a first order phase transition. These theories are modeled by a dual gravitational description. The poles of the holographic Green’s functions appea…

[Phys. Rev. Lett. 117, 091603] Published Fri Aug 26, 2016

]]>Recent progress in the determination of hadronic matrix elements has revealed a tension between the measured value of ${\epsilon}_{K}^{\prime}/{\epsilon}_{K}$, which quantifies direct $CP$ violation in $K\to \pi \pi $ decays, and the standard-model prediction. The well-understood indirect $CP$ violation encoded in the quantity ${\epsilon}_{K}$ typically preclud…

[Phys. Rev. Lett. 117, 091802] Published Fri Aug 26, 2016

]]>We investigated the giant resonance in xenon by high-order harmonic generation spectroscopy driven by a two-color field. The addition of a nonperturbative second harmonic component parallel to the driving field breaks the symmetry between neighboring subcycles resulting in the appearance of spectral…

[Phys. Rev. Lett. 117, 093902] Published Fri Aug 26, 2016

]]>A droplet bouncing and wandering across a liquid surface can produce waves that store the history of its chaotic motion.

[Phys. Rev. Lett. 117, 094502] Published Fri Aug 26, 2016

]]>Hybridization-related modifications of the first metal layer of a metal-organic interface are difficult to access experimentally and have been largely neglected so far. Here, we study the influence of specific chemical bonds (as formed by the organic molecules CuPc and PTCDA) on a Pb-Ag surface allo…

[Phys. Rev. Lett. 117, 096805] Published Fri Aug 26, 2016

]]>We study the onset of spin-density wave order in itinerant electron systems via a two-dimensional lattice model amenable to numerically exact, sign-problem-free determinantal quantum Monte Carlo simulations. The finite-temperature phase diagram of the model reveals a dome-shaped $d$-wave superconducti…

[Phys. Rev. Lett. 117, 097002] Published Fri Aug 26, 2016

]]>The thermal conductivity $\kappa $ of the iron-based superconductor FeSe was measured at temperatures down to 75 mK in magnetic fields up to 17 T. In a zero magnetic field, the electronic residual linear term in the $T=0\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{K}$ limit, ${\kappa}_{0}/T$, is vanishingly small. The application of a magnetic field $B$ causes an ex…

[Phys. Rev. Lett. 117, 097003] Published Fri Aug 26, 2016

]]>We consider a granular gas under the action of gravity, fluidized by a vibrating base. We show that a horizontal temperature gradient, here induced by limiting dissipative lateral walls (DLW), leads always to a granular thermal convection (DLW TC) that is essentially different from ordinary bulk-buo…

[Phys. Rev. Lett. 117, 098006] Published Fri Aug 26, 2016

]]>[Phys. Rev. Lett. 117, 099902] Published Fri Aug 26, 2016

]]>Time-translation symmetry can be spontaneously broken in driven quantum systems opening the door to time crystals, according to new theoretical predictions.

[Phys. Rev. Lett. 117, 090402] Published Thu Aug 25, 2016

]]>We establish the ultimate limits to the compression of sequences of identically prepared qubits. The limits are determined by Holevo’s information quantity and are attained through use of the optimal universal cloning machine, which finds here a novel application to quantum Shannon theory.

[Phys. Rev. Lett. 117, 090502] Published Thu Aug 25, 2016

]]>The direct discovery of gravitational waves has finally opened a new observational window on our Universe, suggesting that the population of coalescing binary black holes is larger than previously expected. These sources produce an unresolved background of gravitational waves, potentially observable…

[Phys. Rev. Lett. 117, 091102] Published Thu Aug 25, 2016

]]>The distribution of galaxies around regions of relatively empty space can be used to constrain cosmological parameters.

[Phys. Rev. Lett. 117, 091302] Published Thu Aug 25, 2016

]]>We consider a question that curiously had not been properly considered thus far: in the standard seesaw model, what is the minimum value the mass of a right-handed (RH) neutrino must have for allowing successful leptogenesis via $CP$-violating decays? Answering this question requires us to take into a…

[Phys. Rev. Lett. 117, 091801] Published Thu Aug 25, 2016

]]>While the dynamics of complete wetting has been widely studied for liquids, the way a gas spreads on a solid is by far less known. We report here the events following the rise of a millimeter-size air bubble towards a textured material immersed in water and covered by a thin plastron of air. Bubbles…

[Phys. Rev. Lett. 117, 094501] Published Thu Aug 25, 2016

]]>The spontaneous formation of plasmoids via the resistive electron tearing of a reconnecting current sheet is observed in the laboratory. These experiments are performed during driven, antiparallel reconnection in the two-fluid regime within the Magnetic Reconnection Experiment. It is found that plas…

[Phys. Rev. Lett. 117, 095001] Published Thu Aug 25, 2016

]]>We study the two-dimensional (2D) Hubbard model using exact diagonalization for spin-$1/2$ fermions on the triangular and honeycomb lattices decorated with a single hexagon per site. In certain parameter ranges, the Hubbard model maps to a quantum compass model on those lattices. On the triangular lat…

[Phys. Rev. Lett. 117, 096405] Published Thu Aug 25, 2016

]]>The two-dimensional metal forming at the interface between an oxide insulator and ${\mathrm{SrTiO}}_{3}$ provides new opportunities for oxide electronics. However, the quantum Hall effect, one of the most fascinating effects of electrons confined in two dimensions, remains underexplored at these complex oxide heter…

[Phys. Rev. Lett. 117, 096804] Published Thu Aug 25, 2016

]]>In the studies of iron pnictides, a key question is whether their bad-metal state from which the superconductivity emerges lies in close proximity with a magnetically ordered insulating phase. Recently, it was found that at low temperatures, the heavily Cu-doped ${\mathrm{NaFe}}_{1-x}{\mathrm{Cu}}_{x}\mathrm{As}$ ($x>0.3$) iron pnictide…

[Phys. Rev. Lett. 117, 097001] Published Thu Aug 25, 2016

]]>We report on the ultraviolet optical response of a color center in hexagonal boron nitride. We demonstrate a mapping between the vibronic spectrum of the color center and the phonon dispersion in hexagonal boron nitride, with a striking suppression of the phonon assisted emission signal at the energ…

[Phys. Rev. Lett. 117, 097402] Published Thu Aug 25, 2016

]]>We demonstrate, experimentally and theoretically, a Talbot effect for hybrid light-matter waves—an exciton-polariton condensate formed in a semiconductor microcavity with embedded quantum wells. The characteristic “Talbot carpet” is produced by loading the exciton-polariton condensate into a microst…

[Phys. Rev. Lett. 117, 097403] Published Thu Aug 25, 2016

]]>We study dynamically crowded solutions of stiff fibers deep in the semidilute regime, where the motion of a single constituent becomes increasingly confined to a narrow tube. The spatiotemporal dynamics for wave numbers resolving the motion in the confining tube becomes accessible in Brownian dynami…

[Phys. Rev. Lett. 117, 097801] Published Thu Aug 25, 2016

]]>Pikovski *et al.* [Nat. Phys. **11**, 668 (2015)] show that a composite particle prepared in a pure initial quantum state and propagated in a uniform gravitational field undergoes a decoherence process at a rate determined by the gravitational acceleration. By assuming Einstein’s equivalence principle to …

[Phys. Rev. Lett. 117, 090401] Published Wed Aug 24, 2016

]]>The Event Horizon Telescope is a global, very long baseline interferometer capable of probing potential deviations from the Kerr metric, which is believed to provide the unique description of astrophysical black holes. Here, we report an updated constraint on the quadrupolar deviation of Sagittarius…

[Phys. Rev. Lett. 117, 091101] Published Wed Aug 24, 2016

]]>Gravitational lensing of fast radio bursts around compact dark matter objects larger than twenty solar masses could be detected in upcoming experiments allowing constraints to be placed on the fraction of dark matter they contain.

[Phys. Rev. Lett. 117, 091301] Published Wed Aug 24, 2016

]]>One of the current challenges in high-harmonic generation is to extend the harmonic cutoff to increasingly high energies while maintaining or even increasing the efficiency of the high-harmonic emission. Here we show that the combined effect of down-chirped pulses and nuclear dynamics in light molec…

[Phys. Rev. Lett. 117, 093003] Published Wed Aug 24, 2016

]]>We study a two-component quasi-two-dimensional Fermi gas with imbalanced spin populations. We probe the gas at different interaction strengths and polarizations by measuring the density of each spin component in the trap and the pair momentum distribution after time of flight. For a wide range of ex…

[Phys. Rev. Lett. 117, 093601] Published Wed Aug 24, 2016

]]>A range of instabilities can occur in soft bodies that undergo large deformation. While most of them arise under compressive forces, it has previously been shown analytically that a tensile instability can occur in an elastic block subjected to equitriaxial tension. Guided by this result, we conduct…

[Phys. Rev. Lett. 117, 094301] Published Wed Aug 24, 2016

]]>Annular quasimonoenergetic electron beams with a mean energy in the range 200–400 MeV and charge on the order of several picocoulombs were generated in a laser wakefield accelerator and subsequently accelerated using a plasma afterburner in a two-stage gas cell. Generation of these beams is associat…

[Phys. Rev. Lett. 117, 094801] Published Wed Aug 24, 2016

]]>Particle dynamics are investigated in plasma turbulence, using self-consistent kinetic simulations, in two dimensions. In the steady state, the trajectories of single protons and proton pairs are studied, at different values of plasma $\beta $ (ratio between kinetic and magnetic pressure). For single-parti…

[Phys. Rev. Lett. 117, 095101] Published Wed Aug 24, 2016

]]>We report on the first observation of an approximant structure to the recently discovered two-dimensional oxide quasicrystal. Using scanning tunneling microscopy, low-energy electron diffraction, and surface x-ray diffraction in combination with *ab initio* calculations, the atomic structure and the b…

[Phys. Rev. Lett. 117, 095501] Published Wed Aug 24, 2016

]]>We perform computer simulations of the quasiliquid layer of ice formed at the ice-vapor interface close to the ice Ih-liquid-vapor triple point of water. Our study shows that the two distinct surfaces bounding the film behave at small wavelengths as atomically rough and independent ice-water and wat…

[Phys. Rev. Lett. 117, 096101] Published Wed Aug 24, 2016

]]>We investigate the time-dependent reformation of the quasiparticle peak in a correlated metal near the Mott transition, after the system is quenched into a hot electron state and equilibrates with an environment which is colder than the Fermi-liquid crossover temperature. Close to the transition, we…

[Phys. Rev. Lett. 117, 096403] Published Wed Aug 24, 2016

]]>Nonsymmorphic symmetries like screws and glides produce electron band touchings, obstructing the formation of a band insulator and leading, instead, to metals or nodal semimetals even when the number of electrons in the unit cell is an even integer. Here, we calculate the electron fillings compatibl…

[Phys. Rev. Lett. 117, 096404] Published Wed Aug 24, 2016

]]>It has been recently shown that non-Abelian defects with localized parafermion zero modes can arise in conventional Abelian fractional quantum Hall (FQH) states. Here we propose an alternate route to creating, manipulating, and measuring topologically protected degeneracies in bilayer FQH states cou…

[Phys. Rev. Lett. 117, 096803] Published Wed Aug 24, 2016

]]>In ferromagnet–normal-metal heterostructures, spin pumping and spin-transfer torques are two reciprocal processes that occur concomitantly. Their interplay introduces a dynamic feedback effect interconnecting energy dissipation channels of both magnetization and current. By solving the spin diffusio…

[Phys. Rev. Lett. 117, 097202] Published Wed Aug 24, 2016

]]>We experimentally study the crystallization of a monolayer of vibrated discs with a built-in polar asymmetry, a model system of active liquids, and contrast it with that of vibrated isotropic discs. Increasing the packing fraction $\varphi $, the quasicontinuous crystallization reported for isotropic discs i…

[Phys. Rev. Lett. 117, 098004] Published Wed Aug 24, 2016

]]>A map of the contact forces between grains in a sand pile provides a first glimpse of how force is distributed in a 3D granular system.

[Phys. Rev. Lett. 117, 098005] Published Wed Aug 24, 2016

]]>The free-space transfer of high-fidelity optical signals between remote locations has many applications, including both classical and quantum communication, precision navigation, clock synchronization, etc. The physical processes that contribute to signal fading and loss need to be carefully analyze…

[Phys. Rev. Lett. 117, 090501] Published Tue Aug 23, 2016

]]>A universal regime describing charge transport in holographic theories with particle-hole symmetry is theoretically predicted, suggesting a link between strongly coupled quantum field theories and quantum chaos.

[Phys. Rev. Lett. 117, 091601] Published Tue Aug 23, 2016

]]>A universal regime describing charge transport in holographic theories with particle-hole symmetry is theoretically predicted, suggesting a link between strongly coupled quantum field theories and quantum chaos.

[Phys. Rev. Lett. 117, 091602] Published Tue Aug 23, 2016

]]>The $\beta $-delayed neutron emission of ${}^{83,84}\mathrm{Ga}$ isotopes was studied using the neutron time-of-flight technique. The measured neutron energy spectra showed emission from states at excitation energies high above the neutron separation energy and previously not observed in the $\beta $ decay of midmass nuclei. The…

[Phys. Rev. Lett. 117, 092502] Published Tue Aug 23, 2016

]]>Attosecond experiments reveal that ionizing a core electron in nitrosobenzene results in a static hole in the core and an intense charge migration in the valence shell.

[Phys. Rev. Lett. 117, 093002] Published Tue Aug 23, 2016

]]>We propose a novel scheme for resolving the contribution of inner- and outer-valence electrons in extreme-ultraviolet (XUV)-initiated high-harmonic generation in neon. By probing the atom with a low-energy (below the $2s$ ionization threshold) ultrashort XUV pulse, the $2p$ electron is steered away from…

[Phys. Rev. Lett. 117, 093201] Published Tue Aug 23, 2016

]]>Phase singularities are dislocations widely studied in optical fields as well as in other areas of physics. With experiment and theory we show that the vectorial nature of light affects the spatial distribution of phase singularities in random light fields. While in scalar random waves phase singula…

[Phys. Rev. Lett. 117, 093901] Published Tue Aug 23, 2016

]]>Discrete breathers are ubiquitous structures in nonlinear anharmonic models ranging from the prototypical example of the Fermi-Pasta-Ulam model to Klein-Gordon nonlinear lattices, among many others. We propose a *general* criterion for the emergence of instabilities of discrete breathers analogous to …

[Phys. Rev. Lett. 117, 094101] Published Tue Aug 23, 2016

]]>Topological states of matter have been widely studied as being driven by an external magnetic field, intrinsic spin-orbital coupling, or magnetic doping. Here, we unveil an interaction-driven spontaneous quantum Hall effect (a Chern insulator) emerging in an extended fermion-Hubbard model on a kagom…

[Phys. Rev. Lett. 117, 096402] Published Tue Aug 23, 2016

]]>The lattice symmetry of a quantum Wigner crystal is deduced from its effect on quantized states in a nearby sheet of electrons.

[Phys. Rev. Lett. 117, 096601] Published Tue Aug 23, 2016

]]>Muon spin relaxation ($\mu \mathrm{SR}$) experiments on single crystals of the structurally perfect triangular antiferromagnet ${\mathrm{YbMgGaO}}_{4}$ indicate the absence of both static long-range magnetic order and spin freezing down to 0.048 K in a zero field. Below 0.4 K, the ${\mu}^{+}$ spin relaxation rates, which are proportional…

[Phys. Rev. Lett. 117, 097201] Published Tue Aug 23, 2016

]]>Dark excitons are of fundamental importance in a broad range of contexts but are difficult to study using conventional optical spectroscopy due to their weak interaction with light. We show how coherent multidimensional spectroscopy can reveal and characterize dark states. Using this approach, we id…

[Phys. Rev. Lett. 117, 097401] Published Tue Aug 23, 2016

]]>Ferroelectricity usually fades away as materials are thinned down below a critical value. We reveal that the unique ionic-potential anharmonicity can induce spontaneous in-plane electrical polarization and ferroelectricity in monolayer group-IV monochalcogenides $MX$ ($M=\mathrm{Ge}$, Sn; $X=\mathrm{S}$, Se). An effective …

[Phys. Rev. Lett. 117, 097601] Published Tue Aug 23, 2016

]]>We show that the interaction of an oil-dispersed colloidal particle with an oil-water interface is highly tunable from attractive to repulsive, either by varying the sign of the colloidal charge via charge regulation or by varying the difference in hydrophilicity between the dissolved cations and an…

[Phys. Rev. Lett. 117, 098002] Published Tue Aug 23, 2016

]]>A sharp transition between liquefaction and transient solidification is observed during impact on a granular suspension depending on the initial packing fraction. We demonstrate, via high-speed pressure measurements and a two-phase modeling, that this transition is controlled by a coupling between t…

[Phys. Rev. Lett. 117, 098003] Published Tue Aug 23, 2016

]]>We report total absorption spectroscopy measurements of ${}^{92}\mathrm{Rb}$, ${}^{96\mathrm{gs}}\mathrm{Y}$, and ${}^{142}\mathrm{Cs}$ $\beta $ decays, which are the most important contributors to the high energy ${\overline{\nu}}_{e}$ spectral shape in nuclear reactors. These three $\beta $ decays contribute 43% of the ${\overline{\nu}}_{e}$ flux near 5.5 MeV emitted by nuclear reactors. This ${\overline{\nu}}_{e}$ energy …

[Phys. Rev. Lett. 117, 092501] Published Mon Aug 22, 2016

]]>Attosecond-resolution experiments have determined the delay in an electron’s emission from a molecule after being ionized with light.

[Phys. Rev. Lett. 117, 093001] Published Mon Aug 22, 2016

]]>Beryllium is a simple alkali earth metal, but has been the target of intensive studies for decades because of its unusual electron behavior at surfaces. The puzzling aspects include (i) severe deviations from the description of the nearly free-electron picture, (ii) an anomalously large electron-pho…

[Phys. Rev. Lett. 117, 096401] Published Mon Aug 22, 2016

]]>Uncondensed spin-singlet electron pairs in a quasi-one-dimensional LaAlO${}_{3}$/SrTiO${}_{3}$ nanowire cavity experience micrometer scale ballistic transport.

[Phys. Rev. Lett. 117, 096801] Published Mon Aug 22, 2016

]]>Numerical results suggest that the quantum Hall effect at $\nu =5/2$ is described by the Pfaffian or anti-Pfaffian state in the absence of disorder and Landau-level mixing. Those states are incompatible with the observed transport properties of GaAs heterostructures, where disorder and Landau-level mixin…

[Phys. Rev. Lett. 117, 096802] Published Mon Aug 22, 2016

]]>We study, from first principles, the pressure exerted by an active fluid of spherical particles on general boundaries in two dimensions. We show that, despite the nonuniform pressure along curved walls, an equation of state is recovered upon a proper spatial averaging. This holds even in the presenc…

[Phys. Rev. Lett. 117, 098001] Published Mon Aug 22, 2016

]]>[Phys. Rev. Lett. 117, 099901] Published Mon Aug 22, 2016

]]>We study odd viscosity in a holographic model of a Weyl semimetal. The model is characterized by a quantum phase transition from a topological semimetal to a trivial semimetal state. Since the model is axisymmetric in three spatial dimensions there are two independent odd viscosities. Both odd visco…

[Phys. Rev. Lett. 117, 081604] Published Fri Aug 19, 2016

]]>Experiments confirm the existence of 1-micrometer-sized molecules made of two cesium atoms by showing that their binding energies agree with predictions.

[Phys. Rev. Lett. 117, 083401] Published Fri Aug 19, 2016

]]>We study, in theory and experiment, the quantum properties of correlated light fields measured with click-counting detectors providing incomplete information on the photon statistics. We establish a correlation parameter for the conditional statistics, and we derive the corresponding nonclassicality…

[Phys. Rev. Lett. 117, 083601] Published Fri Aug 19, 2016

]]>We study the formation of micron-sized spark discharges in high-pressure xenon on the nanosecond time scale. The spark’s energy per length is measured through the expansion dynamics of the generated shock wave, and is observed to scale linearly with the spark radius. At the same time, the surface te…

[Phys. Rev. Lett. 117, 085001] Published Fri Aug 19, 2016

]]>The band gap of HgTe quantum wells can be controlled by adjusting their strain via a substrate lattice mismatch. The achieved band gap of 55 meV is well above room temperature thermal energy, which may allow for technical applications of these 2D topological insulators.

[Phys. Rev. Lett. 117, 086403] Published Fri Aug 19, 2016

]]>We revisit the effect of local interactions on the quadratic band touching (QBT) of the Bernal honeycomb bilayer model using renormalization group (RG) arguments and quantum Monte Carlo (QMC) simulations. We present a RG argument which predicts, contrary to previous studies, that weak interactions d…

[Phys. Rev. Lett. 117, 086404] Published Fri Aug 19, 2016

]]>We use the class of commuting quantum computations known as IQP (instantaneous quantum polynomial time) to strengthen the conjecture that quantum computers are hard to simulate classically. We show that, if either of two plausible average-case hardness conjectures holds, then IQP computations are ha…

[Phys. Rev. Lett. 117, 080501] Published Thu Aug 18, 2016

]]>A fundamental and open question is whether cross-Kerr nonlinearities can be used to construct a controlled-phase (cphase) gate. Here we propose a gate constructed from a discrete set of atom-mediated cross-Kerr interaction sites with counterpropagating photons. We show that the average gate fidelity…

[Phys. Rev. Lett. 117, 080502] Published Thu Aug 18, 2016

]]>New results from the LHCb experiment confirm the 2015 discovery that quarks can combine into groups of five.

[Phys. Rev. Lett. 117, 082002] Published Thu Aug 18, 2016

]]>New results from the LHCb experiment confirm the 2015 discovery that quarks can combine into groups of five.

[Phys. Rev. Lett. 117, 082003] Published Thu Aug 18, 2016

]]>We show that a thermally isolated system driven across a quantum phase transition by a noisy control field exhibits anti-Kibble-Zurek behavior, whereby slower driving results in higher excitations. We characterize the density of excitations as a function of the ramping rate and the noise strength. T…

[Phys. Rev. Lett. 117, 080402] Published Wed Aug 17, 2016

]]>Monte Carlo studies involving real time dynamics are severely restricted by the sign problem that emerges from a highly oscillatory phase of the path integral. In this Letter, we present a new method to compute real time quantities on the lattice using the Schwinger-Keldysh formalism via Monte Carlo…

[Phys. Rev. Lett. 117, 081602] Published Wed Aug 17, 2016

]]>Using the worldline formalism we compute an effective action for fermions under a temporally modulated electric field and a spatially modulated magnetic field. It is known that the former leads to an enhanced Schwinger mechanism, while we find that the latter can also result in enhanced particle pro…

[Phys. Rev. Lett. 117, 081603] Published Wed Aug 17, 2016

]]>We experimentally demonstrate the enhancement of the spontaneous emission rate of GaAs quantum wells embedded in rolled-up metamaterials. We fabricate microtubes whose walls consist of alternating Ag and (In)(Al)GaAs layers with incorporated active GaAs quantum-well structures. By variation of the l…

[Phys. Rev. Lett. 117, 085503] Published Wed Aug 17, 2016

]]>We demonstrate experimentally the efficient control of light intensity distribution inside a random scattering system. The adaptive wave front shaping technique is applied to a silicon waveguide containing scattering nanostructures, and the on-chip coupling scheme enables access to all input spatial…

[Phys. Rev. Lett. 117, 086803] Published Wed Aug 17, 2016

]]>Solitons are very promising for the design of the next generation of ultralow power devices for storage and computation. The key ingredient to achieving this goal is the fundamental understanding of their stabilization and manipulation. Here, we show how the interfacial Dzyaloshinskii-Moriya Interac…

[Phys. Rev. Lett. 117, 087204] Published Wed Aug 17, 2016

]]>We use single-cycle THz fields and the femtosecond magneto-optical Kerr effect to, respectively, excite and probe the magnetization dynamics in two thin-film ferromagnets with different lattice structures: crystalline Fe and amorphous CoFeB. We observe Landau-Lifshitz-torque magnetization dynamics o…

[Phys. Rev. Lett. 117, 087205] Published Wed Aug 17, 2016

]]>Weyl semimetals and nodal line semimetals are characterized by linear band touching at zero-dimensional points and one-dimensional lines, respectively. We predict that a circularly polarized light drives nodal line semimetals into Weyl semimetals. The Floquet Weyl points thus obtained are tunable by…

[Phys. Rev. Lett. 117, 087402] Published Wed Aug 17, 2016

]]>The KamLAND-Zen collaboration has run the most sensitive search to date for a radioactive decay that could reveal whether neutrinos are Majorana fermions.

[Phys. Rev. Lett. 117, 082503] Published Tue Aug 16, 2016

]]>Three-dimensional condensed matter incarnations of Weyl fermions generically have a tilted dispersion—in sharp contrast to their elusive high-energy relatives where a tilt is forbidden by Lorentz invariance, and with the low-energy excitations of two-dimensional graphene sheets where a tilt is forbi…

[Phys. Rev. Lett. 117, 086401] Published Tue Aug 16, 2016

]]>We investigate Weyl semimetals with tilted conical bands in a magnetic field. Even when the cones are overtilted (type-II Weyl semimetal), Landau-level quantization can be possible as long as the magnetic field is oriented close to the tilt direction. Most saliently, the tilt can be described within…

[Phys. Rev. Lett. 117, 086402] Published Tue Aug 16, 2016

]]>We theoretically investigate the dynamics of antiferromagnetic domain walls driven by spin-orbit torques in antiferromagnet–heavy-metal bilayers. We show that spin-orbit torques drive antiferromagnetic domain walls much faster than ferromagnetic domain walls. As the domain wall velocity approaches t…

[Phys. Rev. Lett. 117, 087203] Published Tue Aug 16, 2016

]]>[Phys. Rev. Lett. 117, 089901] Published Tue Aug 16, 2016

]]>[Phys. Rev. Lett. 117, 089902] Published Tue Aug 16, 2016

]]>[Phys. Rev. Lett. 117, 089903] Published Tue Aug 16, 2016

]]>Quantum discord expresses a fundamental nonclassicality of correlations that is more general than entanglement, but that, in its standard definition, is not easily evaluated. We derive a hierarchy of computationally efficient lower bounds to the standard quantum discord. Every nontrivial element of …

[Phys. Rev. Lett. 117, 080401] Published Mon Aug 15, 2016

]]>We study the correlations between the maxima $m$ and $M$ of a Brownian motion (BM) on the time intervals $[0,{t}_{1}]$ and $[0,{t}_{2}]$, with ${t}_{2}>{t}_{1}$. We determine the exact forms of the distribution functions $P(m,M)$ and $P(G=M-m)$, and calculate the moments $\mathbb{E}\{{(M-m)}^{k}\}$ and the cross-moments $\mathbb{E}\{{m}^{l}{M}^{k}\}$ with arbitrary inte…

[Phys. Rev. Lett. 117, 080601] Published Mon Aug 15, 2016

]]>We present exact kinematic consistency relations for cosmological structures that do not vanish at equal times and can thus be measured in surveys. These rely on cross correlations between the density and velocity, or momentum, fields. Indeed, the uniform transport of small-scale structures by long-…

[Phys. Rev. Lett. 117, 081301] Published Mon Aug 15, 2016

]]>We show that there exists a special compactification of QCD on ${\mathbb{R}}^{3}\times {S}^{1}$ in which the theory has a domain where continuous chiral symmetry breaking is analytically calculable. We give a microscopic derivation of the chiral Lagrangian, the chiral condensate, and the Gell-Mann–Oakes–Renner relation ${m}_{\pi}^{2}{f}_{\pi}^{2}\dots $

[Phys. Rev. Lett. 117, 081601] Published Mon Aug 15, 2016

]]>In a previous Letter [Borsanyi *et al.*, Phys. Rev. Lett. **111**, 252001 (2013)] we determined the isospin mass splittings of the baryon octet from a lattice calculation based on ${N}_{f}=2+1$ QCD simulations to which QED effects have been added in a partially quenched setup. Using the same data we determine he…

[Phys. Rev. Lett. 117, 082001] Published Mon Aug 15, 2016

]]>The longitudinal and transverse electromagnetic response functions of ${}^{12}\mathrm{C}$ are computed in a “first-principles” Green’s function Monte Carlo calculation, based on realistic two- and three-nucleon interactions and associated one- and two-body currents. We find excellent agreement between theory and ex…

[Phys. Rev. Lett. 117, 082501] Published Mon Aug 15, 2016

]]>One-neutron knockout reactions have been performed on a beam of radioactive ${}^{53}\mathrm{Co}$ in a high-spin isomeric state. The analysis is shown to yield a highly selective population of high-spin states in an exotic nucleus with a significant cross section, and hence represents a technique that is applicable …

[Phys. Rev. Lett. 117, 082502] Published Mon Aug 15, 2016

]]>We theoretically characterize the semiclassical dynamics of an ensemble of atoms after a sudden quench across a driven-dissipative second-order phase transition. The atoms are driven by a laser and interact via conservative and dissipative long-range forces mediated by the photons of a single-mode c…

[Phys. Rev. Lett. 117, 083001] Published Mon Aug 15, 2016

]]>We investigate the photodouble ionization of ${\mathrm{H}}_{2}$ molecules with 400 eV photons. We find that the emitted electrons do not show any sign of two-center interference fringes in their angular emission distributions if considered separately. In contrast, the quasiparticle consisting of both electrons (i.e…

[Phys. Rev. Lett. 117, 083002] Published Mon Aug 15, 2016

]]>It has been recently predicted theoretically that due to nuclear motion light and heavy hydrogen molecules exposed to strong electric field should exhibit substantially different tunneling ionization rates [O. I. Tolstikhin, H. J. Worner, and T. Morishita, Phys. Rev. A **87**, 041401(R) (2013)]. We stud…

[Phys. Rev. Lett. 117, 083003] Published Mon Aug 15, 2016

]]>A theoretical investigation reveals that the photon drag effect (PDE) is induced in a grating slab with deformation by the Berry curvature in phase space. It drifts the momentum of light, and gives asymmetric PDE signals in momentum space. Large PDE signals are observed even near the $\mathrm{\Gamma}$ point. This c…

[Phys. Rev. Lett. 117, 083901] Published Mon Aug 15, 2016

]]>We show experimentally that a flow-induced, Reynolds number-dependent particle-capture mechanism in branching junctions can be enhanced or eliminated by varying the junction angle. In addition, numerical simulations are used to show that the features responsible for this capture have the signatures …

[Phys. Rev. Lett. 117, 084501] Published Mon Aug 15, 2016

]]>Undesirable electron field emission (also known as dark current) in high gradient rf photocathode guns deteriorates the quality of the photoemission current and limits the operational gradient. To improve the understanding of dark current emission, a high-resolution ($\sim 100\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mu \mathrm{m}$) dark current imaging e…

[Phys. Rev. Lett. 117, 084801] Published Mon Aug 15, 2016

]]>We study the topological properties of elementary excitations in a staggered ${p}_{x}\pm i{p}_{y}$ Bose-Einstein condensate realized in recent orbital optical lattice experiments. The condensate wave function may be viewed as a configuration space variant of the famous ${p}_{x}+i{p}_{y}$ momentum space order parameter of stro…

[Phys. Rev. Lett. 117, 085301] Published Mon Aug 15, 2016

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