Coherence and correlations represent two related properties of a compound system. The system can be, for instance, the polarization of a photon, which forms part of a polarization-entangled two-photon state, or the spatial shape of a coherent beam, where each spatial mode bears different polarizatio…

[Phys. Rev. Lett. 115, 220501] Published Wed Nov 25, 2015

]]>We introduce a simple protocol for verifiable measurement-only blind quantum computing. Alice, a client, can perform only single-qubit measurements, whereas Bob, a server, can generate and store entangled many-qubit states. Bob generates copies of a graph state, which is a universal resource state f…

[Phys. Rev. Lett. 115, 220502] Published Wed Nov 25, 2015

]]>We study the dynamics of a tracer particle (TP) on a comb lattice populated by randomly moving hard-core particles in the dense limit. We first consider the case where the TP is constrained to move on the backbone of the comb only. In the limit of high density of the particles, we present exact anal…

[Phys. Rev. Lett. 115, 220601] Published Wed Nov 25, 2015

]]>We study the thermal and nonthermal steady-state scaling functions and the steady-state dynamics of a model of local quantum criticality. The model we consider, i.e., the pseudogap Kondo model, allows us to study the concept of effective temperatures near fully interacting as well as weak-coupling f…

[Phys. Rev. Lett. 115, 220602] Published Wed Nov 25, 2015

]]>Mounting evidence suggests that the TeV–PeV neutrino flux detected by the IceCube telescope has mainly an extragalactic origin. If such neutrinos are primarily produced by a single class of astrophysical sources via hadronuclear ($pp$) interactions, a similar flux of gamma-ray photons is expected. For…

[Phys. Rev. Lett. 115, 221101] Published Wed Nov 25, 2015

]]>In view of the significantly different proton charge radius extracted from muonic hydrogen Lamb shift measurements as compared to electronic hydrogen spectroscopy or electron-scattering experiments, we study in this Letter the photoproduction of a lepton pair on a proton target in the limit of very …

[Phys. Rev. Lett. 115, 221804] Published Wed Nov 25, 2015

]]>We report the first measurement of the absolute branching fraction for ${\mathrm{\Lambda}}_{c}^{+}\to \mathrm{\Lambda}{e}^{+}{\nu}_{e}$. This measurement is based on $567\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{pb}}^{-1}$ of ${e}^{+}{e}^{-}$ annihilation data produced at $\sqrt{s}=4.599\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{GeV}$, which is just above the ${\mathrm{\Lambda}}_{c}^{+}{\overline{\mathrm{\Lambda}}}_{c}^{-}$ threshold. The data were collected with the BESIII detector at the BEPCII storage rings. The br…

[Phys. Rev. Lett. 115, 221805] Published Wed Nov 25, 2015

]]>Unlike the bewildering situation in the $\gamma {\gamma}^{*}\to \pi $ form factor, a widespread view is that perturbative QCD can decently account for the recent *BABAR* measurement of the $\gamma {\gamma}^{*}\to {\eta}_{c}$ transition form factor. The next-to-next-to-leading-order perturbative correction to the $\gamma {\gamma}^{*}\to {\eta}_{c,b}$ form factor, is investigated in …

[Phys. Rev. Lett. 115, 222001] Published Wed Nov 25, 2015

]]>We perform a lattice QCD calculation of the hadronic light-by-light scattering amplitude in a broad kinematical range. At forward kinematics, the results are compared to a phenomenological analysis based on dispersive sum rules for light-by-light scattering. The size of the pion pole contribution is…

[Phys. Rev. Lett. 115, 222003] Published Wed Nov 25, 2015

]]>The isospin mixing was deduced in the compound nucleus ${}^{80}\mathrm{Zr}$ at an excitation energy of ${E}^{*}=54\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{MeV}$ from the $\gamma $ decay of the giant dipole resonance. The reaction ${}^{40}\mathrm{Ca}+{}^{40}\mathrm{Ca}$ at ${E}_{\text{beam}}=136\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{MeV}$ was used to form the compound nucleus in the isospin $I=0$ channel, while the reaction ${}^{37}\mathrm{Cl}+{}^{44}\mathrm{Ca}$ at ${E}_{\text{beam}}=95\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{MeV}$ w…

[Phys. Rev. Lett. 115, 222502] Published Wed Nov 25, 2015

]]>The well-known Levinger-Bethe photonuclear sum rule relates the strength of the photoexcitation of the giant dipole resonance in a nucleus to the number of nucleons in that nucleus. I extend this sum rule to the case of virtual photons and relate the size of the magnetic polarizability of a nucleus …

[Phys. Rev. Lett. 115, 222503] Published Wed Nov 25, 2015

]]>We propose and analyze theoretically a cavity optomechanical analog of a heat pump that uses a polariton fluid to cool mechanical modes coupled to a single precooled phonon mode via external modulation of the substrate of the mechanical resonator. This approach permits us to cool phonon modes of arb…

[Phys. Rev. Lett. 115, 223602] Published Wed Nov 25, 2015

]]>A single superconducting artificial atom can be used for coupling electromagnetic fields up to the single-photon level due to an easily achieved strong coupling regime. Bringing a pair of harmonic oscillators into resonance with the transitions of a three-level atom converts atomic spontaneous proce…

[Phys. Rev. Lett. 115, 223603] Published Wed Nov 25, 2015

]]>Spatial modulation of the incident wave front has become a powerful method for controlling the diffusive transport of light in disordered media; however, such interference-based control is intrinsically sensitive to frequency detuning. Here, we show analytically and numerically that certain wave fro…

[Phys. Rev. Lett. 115, 223901] Published Wed Nov 25, 2015

]]>Light pulses in an optical fiber with a large core can undergo dramatic oscillations in their intensity. These oscillations cause a near-infrared pulse to spray off new pulses at wavelengths that range from the mid-infrared to the ultraviolet.

[Phys. Rev. Lett. 115, 223902] Published Wed Nov 25, 2015

]]>$\beta $ and $\alpha $ relaxation processes are dynamical scaling regimes of glassy systems occurring on two separate time scales which both diverge as the glass state is approached. We study here the crossover scaling from $\beta $ to $\alpha $ relaxation in the cooperative facilitation scenario (CFS) and show that it is quanti…

[Phys. Rev. Lett. 115, 225701] Published Wed Nov 25, 2015

]]>The use of graphene in spintronic devices depends, among other things, on its ability to convert a spin excitation into an electric charge signal, a phenomenon that requires a spin-orbit coupling (SOC). Here we report the observation of two effects that show the existence of SOC in large-area CVD gr…

[Phys. Rev. Lett. 115, 226601] Published Wed Nov 25, 2015

]]>Optoelectronics applications for transition-metal dichalcogenides are still limited by weak light absorption and their complex exciton modes are easily perturbed by varying excitation conditions because they are inherent in atomically thin layers. Here, we propose a method of selectively amplifying …

[Phys. Rev. Lett. 115, 226801] Published Wed Nov 25, 2015

]]>Cooper pair splitting (CPS) is a process in which the electrons of the naturally occurring spin-singlet pairs in a superconductor are spatially separated using two quantum dots. Here, we investigate the evolution of the conductance correlations in an InAs CPS device in the presence of an external ma…

[Phys. Rev. Lett. 115, 227003] Published Wed Nov 25, 2015

]]>Polymers in a melt may be subject to topological constraints, as in the example of unlinked polymer rings. How to do statistical mechanics in the presence of such constraints remains a fundamental open problem. We study the effect of topological constraints on a melt of directed polymers, using simu…

[Phys. Rev. Lett. 115, 228303] Published Wed Nov 25, 2015

]]>Experiments explain the significant increase in viscosity that occurs when stirring a mixture of cornstarch and water.

[Phys. Rev. Lett. 115, 228304] Published Wed Nov 25, 2015

]]>Under the eigenstate thermalization hypothesis (ETH), quantum-quenched systems equilibrate towards canonical, thermal ensembles. While at first glance the ETH might seem a very strong hypothesis, we show that it is indeed not only sufficient but also necessary for thermalization. More specifically, …

[Phys. Rev. Lett. 115, 220401] Published Tue Nov 24, 2015

]]>The familiar concepts of state vectors and operators in quantum mechanics rely on associative products of observables. However, these notions do not apply to some exotic systems such as magnetic monopoles, which have long been known to lead to nonassociative algebras. Their quantum physics has remai…

[Phys. Rev. Lett. 115, 220402] Published Tue Nov 24, 2015

]]>We study electrical transport in a strongly coupled strange metal in two spatial dimensions at finite temperature and charge density, holographically dual to the Einstein-Maxwell theory in an asymptotically four-dimensional anti–de Sitter space spacetime, with arbitrary spatial inhomogeneity, up to …

[Phys. Rev. Lett. 115, 221601] Published Tue Nov 24, 2015

]]>Vector triplets of the standard model $\mathrm{SU}(2{)}_{L}$ group are a universal prediction of “natural” new physics models involving a new composite sector and are therefore among the most plausible new particles that the LHC could discover. We consider the possibility that one such triplet could account for the…

[Phys. Rev. Lett. 115, 221802] Published Tue Nov 24, 2015

]]>We report the first observation of the decays ${B}^{0}\to p\overline{\mathrm{\Lambda}}{D}^{(*)-}$. The data sample of $711\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{fb}}^{-1}$ used in this analysis corresponds to $772\times {10}^{6}$ $B\overline{B}$ pairs, collected at the $\mathrm{\Upsilon}(4S)$ resonance by the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{-}$ collider. We observe $19.8\sigma $ and $10.8\sigma $ excesses of events for the tw…

[Phys. Rev. Lett. 115, 221803] Published Tue Nov 24, 2015

]]>A neutral structure in the $D{\overline{D}}^{*}$ system around the $D{\overline{D}}^{*}$ mass threshold is observed with a statistical significance greater than $10\sigma $ in the processes ${e}^{+}{e}^{-}\to {D}^{+}{D}^{*-}{\pi}^{0}+\mathrm{c}\mathrm{.}\mathrm{c}\mathrm{.}$ and ${e}^{+}{e}^{-}\to {D}^{0}{\overline{D}}^{*0}{\pi}^{0}+\mathrm{c}\mathrm{.}\mathrm{c}\mathrm{.}$ at $\sqrt{s}=4.226$ and 4.257 GeV in the BESIII experiment. The structure is denoted as ${Z}_{c}(3885{)}^{0}$. Assuming the presence…

[Phys. Rev. Lett. 115, 222002] Published Tue Nov 24, 2015

]]>Collisions between prolate uranium nuclei are used to study how particle production and azimuthal anisotropies depend on initial geometry in heavy-ion collisions. We report the two- and four-particle cumulants, ${v}_{2}\{2\}$ and ${v}_{2}\{4\}$, for charged hadrons from $\mathrm{U}+\mathrm{U}$ collisions at $\sqrt{{s}_{\mathrm{NN}}}=193\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{GeV}$ and $\mathrm{Au}+\mathrm{Au}$ collis…

[Phys. Rev. Lett. 115, 222301] Published Tue Nov 24, 2015

]]>The energy spacing of the spin-doublet states in the ${}_{\mathrm{\Lambda}}^{4}$He hypernucleus indicate a large spin dependent charge symmetry breaking in the $\mathrm{\Lambda}\phantom{\rule{0}{0ex}}N$ interaction.

[Phys. Rev. Lett. 115, 222501] Published Tue Nov 24, 2015

]]>We report on the rotational-state-dependent, transverse acceleration of ${\mathrm{CS}}_{2}$ molecules affected by pulsed optical standing waves. The steep gradient of the standing wave potential imparts far stronger dipole forces on the molecules than propagating pulses do. Moreover, large changes in the transverse…

[Phys. Rev. Lett. 115, 223001] Published Tue Nov 24, 2015

]]>Recent findings on the similarity between electron and positronium scattering at the same velocity [Brawley *et al.*, Science **330**, 789 (2010)] have guided us towards the realization of a detectable flux of positronium atoms at beam energies five times lower than previously obtained, enabling total cro…

[Phys. Rev. Lett. 115, 223201] Published Tue Nov 24, 2015

]]>An optically thick cold atomic cloud emits a coherent flash of light in the forward direction when the phase of an incident probe field is abruptly changed. Because of cooperativity, the duration of this phenomena can be much shorter than the excited lifetime of a single atom. Repeating periodically…

[Phys. Rev. Lett. 115, 223601] Published Tue Nov 24, 2015

]]>We introduce a method for calculating the probability with which a low-energy electron hitting the wall of a bounded plasma gets stuck in it and apply the method to a dielectric wall with positive electron affinity smaller than the band gap using MgO as an example. In accordance with electron beam s…

[Phys. Rev. Lett. 115, 225001] Published Tue Nov 24, 2015

]]>A chiral $d$-wave superfluid is a preliminary example of interacting topological matter. However, unlike $s$-wave superfluids prevalent in nature, its existence requires a strong $d$-wave interaction, a criterion that is difficult to access in ordinary systems. There is no experimental observation of such…

[Phys. Rev. Lett. 115, 225301] Published Tue Nov 24, 2015

]]>We measure the magnetotransport properties of the three-dimensional Dirac semimetal ${\mathrm{Cd}}_{3}{\mathrm{As}}_{2}$ single crystal under magnetic fields up to 36 T. Shubnikov–de Haas (SdH) oscillations are clearly resolved and the $n=1$ Landau level is reached. A detailed analysis on the intercept of the Landau index plot rev…

[Phys. Rev. Lett. 115, 226401] Published Tue Nov 24, 2015

]]>Barium bismuth oxide (${\mathrm{BaBiO}}_{3}$) is the end member of two families of high-${T}_{c}$ superconductors, i.e., ${\mathrm{BaPb}}_{1-x}{\mathrm{Bi}}_{x}{\mathrm{O}}_{3}$ and ${\mathrm{Ba}}_{1-x}{\mathrm{K}}_{x}{\mathrm{BiO}}_{3}$. The undoped parent compound is an insulator, exhibiting a charge density wave that is strongly linked to a static breathing distortion in the oxygen sublattice of the perov…

[Phys. Rev. Lett. 115, 226402] Published Tue Nov 24, 2015

]]>We study a twisted Hubbard tube modeling the $[\mathrm{CrAs}{]}_{\infty}$ structure of quasi-one-dimensional superconductors ${A}_{2}{\mathrm{Cr}}_{3}{\mathrm{As}}_{3}$ ($A=\mathrm{K}$, Rb, Cs). The molecular-orbital bands emerging from the quasi-degenerate atomic orbitals are exactly solved. An effective Hamiltonian is derived for a region where three partially fi…

[Phys. Rev. Lett. 115, 227001] Published Tue Nov 24, 2015

]]>We develop a microscopic and gauge-invariant theory for collective modes resulting from the phase of the superconducting order parameter in noncentrosymmetric superconductors. Considering various crystal symmetries, we derive the corresponding gauge mode ${\omega}_{G}(\mathbf{q})$ and find, in particular, new Leggett mo…

[Phys. Rev. Lett. 115, 227002] Published Tue Nov 24, 2015

]]>The glass transition of colloidal dispersions interacting with both a short-ranged attraction and long-ranged repulsion is studied using highly purified lysozyme solutions. Newtonian liquid behavior is observed at all conditions while measurements of the dynamics in the short-time limit show feature…

[Phys. Rev. Lett. 115, 228302] Published Tue Nov 24, 2015

]]>A theoretical proposal ties the puzzling light mass of the Higgs particle to a hypothetical new particle that plays an important role during the big bang.

[Phys. Rev. Lett. 115, 221801] Published Mon Nov 23, 2015

]]>Using simulation and numerical self-consistent field theory of an unentangled diblock copolymer melt, we study the interplay between relaxation of molecular conformations from a highly stretched, nonequilibrium state and structure formation of the local, conserved density during self-assembly from a…

[Phys. Rev. Lett. 115, 228301] Published Mon Nov 23, 2015

]]>Fractional Brownian motion is a non-Markovian Gaussian process ${X}_{t}$, indexed by the Hurst exponent $H$. It generalizes standard Brownian motion (corresponding to $H=1/2$). We study the probability distribution of the maximum $m$ of the process and the time ${t}_{\mathrm{max}}$ at which the maximum is reached. They are enco…

[Phys. Rev. Lett. 115, 210601] Published Fri Nov 20, 2015

]]>Gravity theories beyond general relativity typically predict dipolar gravitational emission by compact-star binaries. This emission is sourced by “sensitivity” parameters depending on the stellar compactness. We introduce a general formalism to calculate these parameters, and show that in shift-symm…

[Phys. Rev. Lett. 115, 211105] Published Fri Nov 20, 2015

]]>We present a renormalizable theory that includes a ${W}^{\prime}$ boson of mass in the 1.8–2 TeV range, which may explain the excess events reported by the ATLAS Collaboration in a $WZ$ final state, and by the CMS Collaboration in ${e}^{+}{e}^{-}jj$, $W{h}^{0}$, and $jj$ final states. The ${W}^{\prime}$ boson couples to right-handed quarks and l…

[Phys. Rev. Lett. 115, 211802] Published Fri Nov 20, 2015

]]>We present the calculations on a novel reorientation effect of deuteron attributed to isovector interaction in the nuclear field of heavy target nuclei. The correlation angle determined by the relative momentum vector of the proton and the neutron originating from the breakup deuteron, which is expe…

[Phys. Rev. Lett. 115, 212501] Published Fri Nov 20, 2015

]]>Laser-heater systems are essential tools to control and optimize high-gain free-electron lasers (FELs) working in the x-ray wavelength range. Indeed, these systems induce a controllable increase of the energy spread of the electron bunch. The heating suppresses longitudinal microbunching instability…

[Phys. Rev. Lett. 115, 214801] Published Fri Nov 20, 2015

]]>A model for the equilibrium coupling of an ion system with varying initial hard-sphere Rydberg blockade correlations is used to quantify the suppression of disorder-induced heating in Coulomb-expanding cold ion bunches. We show that bunches with experimentally achievable blockade parameters have an …

[Phys. Rev. Lett. 115, 214802] Published Fri Nov 20, 2015

]]>We predict a bistability in the photon emission from a solid-state single-atom laser comprising a microwave cavity coupled to a voltage-biased double quantum dot. To demonstrate that the single-atom laser is bistable, we evaluate the photon emission statistics and show that the distribution takes th…

[Phys. Rev. Lett. 115, 216803] Published Fri Nov 20, 2015

]]>Technological applications of many-body structures that emerge in gated devices under minimal control are largely unexplored. Here we show how emergent Wigner crystals in a semiconductor quantum wire can facilitate a pivotal requirement for a scalable quantum computer, namely, transmitting quantum i…

[Phys. Rev. Lett. 115, 216804] Published Fri Nov 20, 2015

]]>The Hofstadter model is a simple yet powerful Hamiltonian to study quantum Hall physics in a lattice system, manifesting its essential topological states. Lattice dimerization in the Hofstadter model opens an energy gap at half filling. Here we show that even if the ensuing insulator has a Chern num…

[Phys. Rev. Lett. 115, 216805] Published Fri Nov 20, 2015

]]>It is well known that a nonvanishing Hall conductivity requires broken time-reversal symmetry. However, in this work, we demonstrate that Hall-like currents can occur in second-order response to external electric fields in a wide class of time-reversal invariant and inversion breaking materials, at …

[Phys. Rev. Lett. 115, 216806] Published Fri Nov 20, 2015

]]>Exact calculated time evolutions in the framework of a many-electron model of itinerant magnetism provide new insights into the laser-induced ultrafast demagnetization observed in ferromagnetic (FM) transition metal thin films. The interplay between local spin-orbit interactions and interatomic hopp…

[Phys. Rev. Lett. 115, 217204] Published Fri Nov 20, 2015

]]>Researchers used a viscous fluid to disrupt the operation of a molecular motor that transports material inside biological cells, giving insights into how it works.

[Phys. Rev. Lett. 115, 218102] Published Fri Nov 20, 2015

]]>Diffusion of information, behavioral patterns or innovations follows diverse pathways depending on a number of conditions, including the structure of the underlying social network, the sensitivity to peer pressure and the influence of media. Here we study analytically and by simulations a general mo…

[Phys. Rev. Lett. 115, 218702] Published Fri Nov 20, 2015

]]>[Phys. Rev. Lett. 115, 219902] Published Fri Nov 20, 2015

]]>Quantum magnetism that goes beyond nearest-neighbor correlations has been observed in a string of four ultracold fermions.

[Phys. Rev. Lett. 115, 215301] Published Thu Nov 19, 2015

]]>In the normal-metal–ferromagnetic-insulator bilayer (such as $\mathrm{Pt}/{\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$) and the normal-metal–ferromagnetic-metal–oxide trilayer (such as $\mathrm{Pt}/\mathrm{Co}/{\mathrm{AlO}}_{x}$) where spin injection and ejection are achieved by the spin Hall effect in the normal metal, we propose a minimal model based on quantum tunneling of …

[Phys. Rev. Lett. 115, 217203] Published Thu Nov 19, 2015

]]>A theoretical analysis explains why circadian clocks can be robust but also able to adapt to environmental changes.

[Phys. Rev. Lett. 115, 218101] Published Thu Nov 19, 2015

]]>We introduce state-independent, nonperturbative Hamiltonian quantum speed limits for population leakage and fidelity loss, for a gapped open system interacting with a reservoir. These results hold in the presence of initial correlations between the system and the reservoir, under the sole assumption…

[Phys. Rev. Lett. 115, 210402] Published Wed Nov 18, 2015

]]>Thermodynamic laws that are unique to quantum systems in a superposition of states have been derived using an information-theory approach.

[Phys. Rev. Lett. 115, 210403] Published Wed Nov 18, 2015

]]>Electron and ion heating characteristics during merging reconnection start-up on the MAST spherical tokamak have been revealed in detail using a 130 channel yttrium aluminum garnet (YAG) and a 300 channel Ruby-Thomson scattering system and a new 32 chord ion Doppler tomography diagnostic. Detailed 2…

[Phys. Rev. Lett. 115, 215004] Published Wed Nov 18, 2015

]]>We have investigated plasmonic excitations at the surface of ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}(0001)$ via high-resolution electron energy loss spectroscopy. For low parallel momentum transfer ${q}_{\parallel}$, the loss spectrum shows a distinctive feature peaked at 104 meV. This mode varies weakly with ${q}_{\parallel}$. The behavior of its intensity as a…

[Phys. Rev. Lett. 115, 216802] Published Wed Nov 18, 2015

]]>We introduce a quantum dimer model on the hexagonal lattice that, in addition to the standard three-dimer kinetic and potential terms, includes a competing potential part counting dimer-free hexagons. The zero-temperature phase diagram is studied by means of quantum Monte Carlo simulations, suppleme…

[Phys. Rev. Lett. 115, 217202] Published Wed Nov 18, 2015

]]>A novel time-resolved cathodoluminescence method, where a pulsed electron beam is generated via the photoelectric effect, is used to probe individual CdTe grain boundaries. Excitons have a short lifetime ($\le 100\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{ps}$) within the grains and are rapidly quenched at the grain boundary. However, a $\sim 47\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{meV}$…

[Phys. Rev. Lett. 115, 218701] Published Wed Nov 18, 2015

]]>[Phys. Rev. Lett. 115, 219901] Published Wed Nov 18, 2015

]]>Einstein-Podolsky-Rosen steering is a manifestation of quantum correlations exhibited by quantum systems that allows for entanglement certification when one of the subsystems is not characterized. Detecting the steerability of quantum states is essential to assess their suitability for quantum infor…

[Phys. Rev. Lett. 115, 210401] Published Tue Nov 17, 2015

]]>Improved measurements of the helium cosmic ray spectrum taken by the space-based Alpha Magnetic Spectrometer find deviations from a single power law behavior.

[Phys. Rev. Lett. 115, 211101] Published Tue Nov 17, 2015

]]>Advanced interferometric gravitational-wave detectors use optical cavities to resonantly enhance their shot-noise-limited sensitivity. Because of positive dispersion of these cavities—signals at different frequencies pick up different phases, there is a tradeoff between the detector bandwidth and pe…

[Phys. Rev. Lett. 115, 211104] Published Tue Nov 17, 2015

]]>Evanescent operators such as the Gauss-Bonnet term have vanishing perturbative matrix elements in exactly $D=4$ dimensions. Similarly, evanescent fields do not propagate in $D=4$; a three-form field is in this class, since it is dual to a cosmological-constant contribution. In this Letter, we show that …

[Phys. Rev. Lett. 115, 211301] Published Tue Nov 17, 2015

]]>The adiabatic perturbation of dark matter is damped during the kinetic decoupling due to the collision with a relativistic component on subhorizon scales. However, the isocurvature part is free from damping and could be large enough to make a substantial contribution to the formation of small scale …

[Phys. Rev. Lett. 115, 211302] Published Tue Nov 17, 2015

]]>We report the first lattice QCD calculation of the complex kaon decay amplitude ${A}_{0}$ with physical kinematics, using a ${32}^{3}\times 64$ lattice volume and a single lattice spacing $a$, with $1/a=1.3784(68)\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{GeV}$. We find $\mathrm{Re}({A}_{0})=4.66(1.00)(1.26)\times 1{0}^{-7}\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{GeV}$ and $\mathrm{Im}({A}_{0})=-1.90(1.23)(1.08)\times 1{0}^{-11}\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{GeV}$, where the first erro…

[Phys. Rev. Lett. 115, 212001] Published Tue Nov 17, 2015

]]>We present lattice QCD results on the neutron tensor charges including, for the first time, a simultaneous extrapolation in the lattice spacing, volume, and light quark masses to the physical point in the continuum limit. We find that the “disconnected” contribution is smaller than the statistical e…

[Phys. Rev. Lett. 115, 212002] Published Tue Nov 17, 2015

]]>Unpolarized and beam-polarized fourfold cross sections $({d}^{4}\sigma /d{Q}^{2}d{x}_{B}dtd\varphi )$ for the $ep\to {e}^{\prime}{p}^{\prime}\gamma $ reaction were measured using the CLAS detector and the 5.75-GeV polarized electron beam of the Jefferson Lab accelerator, for 110 (${Q}^{2},{x}_{B},t$) bins over the widest phase space ever explored in the valence-quark reg…

[Phys. Rev. Lett. 115, 212003] Published Tue Nov 17, 2015

]]>Self-similar corrugated instabilities form after intense localized explosions in dissipative gasses.

[Phys. Rev. Lett. 115, 214301] Published Tue Nov 17, 2015

]]>We demonstrate that in a 3D resistive magnetohydrodynamic simulation, for some parameters it is possible to form a stationary state in a tokamak where a saturated interchange mode in the center of the discharge drives a near helical flow pattern that acts to nonlinearly sustain the configuration by …

[Phys. Rev. Lett. 115, 215001] Published Tue Nov 17, 2015

]]>In a wide variety of natural and laboratory magnetized plasmas, filaments appear as a result of interchange instability. These convective structures substantially enhance transport in the direction perpendicular to the magnetic field. According to filament models, their propagation may follow differ…

[Phys. Rev. Lett. 115, 215002] Published Tue Nov 17, 2015

]]>We report on the first self-consistent numerical study of the feasibility of laser-driven relativistic pair shocks of prime interest for high-energy astrophysics. Using a QED-particle-in-cell code, we simulate the collective interaction between two counterstreaming electron-positron jets driven from…

[Phys. Rev. Lett. 115, 215003] Published Tue Nov 17, 2015

]]>An array of equally spaced nanowires, dubbed metacage, could block optical radiation from entering or escaping a region of arbitrary shape.

[Phys. Rev. Lett. 115, 215501] Published Tue Nov 17, 2015

]]>The mechanism of flow in glassy materials is interrogated using mechanical spectroscopy applied to model nearly hard sphere colloidal glasses during flow. Superimposing a small amplitude oscillatory motion orthogonal onto steady shear flow makes it possible to directly evaluate the effect of a stead…

[Phys. Rev. Lett. 115, 218301] Published Tue Nov 17, 2015

]]>Using backwards ray tracing, we study the shadows of Kerr black holes with scalar hair (KBHSH). KBHSH interpolate continuously between Kerr BHs and boson stars (BSs), so we start by investigating the lensing of light due to BSs. Moving from the weak to the strong gravity region, BSs—which by themsel…

[Phys. Rev. Lett. 115, 211102] Published Mon Nov 16, 2015

]]>Analysis of data from the Fermi Large Angle Telescope provides an indication of halos of gamma ray pairs around blazars at low redshift, and supports an estimate of the intergalactic magnetic field.

[Phys. Rev. Lett. 115, 211103] Published Mon Nov 16, 2015

]]>In the $\mathrm{AdS}/\mathrm{CFT}$ correspondence, states obtained by Hamiltonian evolution of the thermofield doubled state are also dual to an eternal black-hole geometry, which is glued to the boundary with a time shift generated by a large diffeomorphism. We describe gauge-invariant relational observables that prob…

[Phys. Rev. Lett. 115, 211601] Published Mon Nov 16, 2015

]]>We propose a new method for determining the coupling of the Higgs boson to charm quarks, via Higgs production in association with a charm-tagged jet: $pp\to hc$. As a first estimate, we find that at the LHC with $3000\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{fb}}^{-1}$, it should be possible to derive a constraint of order one, relative to the standa…

[Phys. Rev. Lett. 115, 211801] Published Mon Nov 16, 2015

]]>Ultrafast laser pulses can be used to control and characterize the quantum motion of a single trapped ion over 5 orders of magnitude in temperature.

[Phys. Rev. Lett. 115, 213001] Published Mon Nov 16, 2015

]]>The ratio of the Zeeman splitting to the cyclotron energy ($M=\mathrm{\Delta}{E}_{Z}/\hslash {\omega}_{c}$) for holelike carriers in bismuth has been quantified with great precision by many experiments performed during the past five decades. It exceeds 2 when the magnetic field is along the trigonal axis and vanishes in the perpendicula…

[Phys. Rev. Lett. 115, 216401] Published Mon Nov 16, 2015

]]>Spontaneous breaking of helical symmetry in 1d interacting systems can result in symmetry protected ballistic transport.

[Phys. Rev. Lett. 115, 216402] Published Mon Nov 16, 2015

]]>We report the observation of two fundamental subgap transport processes through a quantum dot (QD) with a superconducting contact. The device consists of a carbon nanotube contacted by a Nb superconducting and a normal metal contact. First, we find a single resonance with position, shape, and amplit…

[Phys. Rev. Lett. 115, 216801] Published Mon Nov 16, 2015

]]>The origins of the anomalous temperature dependence of magnetocrystalline anisotropy in $({\mathrm{Fe}}_{1-x}{\mathrm{Co}}_{x}{)}_{2}\mathrm{B}$ alloys are elucidated using first-principles calculations within the disordered local moment model. Excellent agreement with experimental data is obtained. The anomalies are associated with the chang…

[Phys. Rev. Lett. 115, 217201] Published Mon Nov 16, 2015

]]>We have investigated the spin texture of surface Fermi arcs in the recently discovered Weyl semimetal TaAs using spin- and angle-resolved photoemission spectroscopy. The experimental results demonstrate that the Fermi arcs are spin polarized. The measured spin texture fulfills the requirement of mir…

[Phys. Rev. Lett. 115, 217601] Published Mon Nov 16, 2015

]]>We have utilized time-domain magnetoterahertz spectroscopy to investigate the low-frequency optical response of the topological insulator ${\mathrm{Cu}}_{0.02}{\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ and ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ films. With both field and frequency dependence, such experiments give sufficient information to measure the mobility and carrier density …

[Phys. Rev. Lett. 115, 217602] Published Mon Nov 16, 2015

]]>When a strongly cooperative species invades new territory, its spread can slow down or stop, according to a mathematical model, suggesting potential strategies against cancer and insect pests.

[Phys. Rev. Lett. 115, 208104] Published Fri Nov 13, 2015

]]>[Phys. Rev. Lett. 115, 209902] Published Fri Nov 13, 2015

]]>We show how a test of macroscopic realism based on Leggett-Garg inequalities (LGIs) can be performed in a macroscopic system. Using a continuous-variable approach, we consider quantum nondemolition (QND) measurements applied to atomic ensembles undergoing magnetically driven coherent oscillation. We…

[Phys. Rev. Lett. 115, 200403] Published Thu Nov 12, 2015

]]>We develop an accurate finite-time scaling analysis of the angular width of the coherent backscattering (CBS) peak for waves propagating in 3D random media. Applying this method to ultracold atoms in optical speckle potentials, we show how to determine both the mobility edge and the critical exponen…

[Phys. Rev. Lett. 115, 200602] Published Thu Nov 12, 2015

]]>We demonstrate that massive fields, such as dark matter, can directly produce a cosmological evolution of the fundamental constants of nature. We show that a scalar or pseudoscalar (axionlike) dark matter field $\varphi $, which forms a coherently oscillating classical field and interacts with standard model…

[Phys. Rev. Lett. 115, 201301] Published Thu Nov 12, 2015

]]>The maximum amount of radiative heat that can be transferred between two objects of any shape has been calculated for separations of less than the thermal wavelength.

[Phys. Rev. Lett. 115, 204302] Published Thu Nov 12, 2015

]]>Electron microscopy experiments have measured the spin state of individual metal atoms on a graphene layer, characterizing their potential for information storage applications.

[Phys. Rev. Lett. 115, 206803] Published Thu Nov 12, 2015

]]>Five dimensional black hole solutions that describe the QCD crossover transition seen in $(2+1)$-flavor lattice QCD calculations at zero and nonzero baryon densities are used to obtain predictions for the baryon susceptibility, baryon conductivity, baryon diffusion constant, and thermal conductivity o…

[Phys. Rev. Lett. 115, 202301] Published Wed Nov 11, 2015

]]>The devil’s staircase is a fractal structure that characterizes the ground state of one-dimensional classical lattice gases with long-range repulsive convex interactions. Its plateaus mark regions of stability for specific filling fractions which are controlled by a chemical potential. Typically, su…

[Phys. Rev. Lett. 115, 203001] Published Wed Nov 11, 2015

]]>A type of quantum oscillation—known to occur for electrons in a crystal—has now been observed in a gas of molecular rotors that are spun around by laser pulses.

[Phys. Rev. Lett. 115, 203002] Published Wed Nov 11, 2015

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