We gauge-fix the standard model effective field theory in a manner invariant under background-field gauge transformations using a geometric description of the field connections.

[Phys. Rev. Lett. 120, 251801] Published Fri Jun 22, 2018

]]>Cold atoms experiments offer invaluable information on superfluid dynamics, including decay cascades of topological defects. While the cascade properties are well established for Bose systems, our understanding of their behavior in Fermi counterparts is very limited, in particular in spin-imbalanced...

[Phys. Rev. Lett. 120, 253002] Published Fri Jun 22, 2018

]]>Rotational transitions of the nonlinear triatomic molecular anion ${{\mathrm{NH}}_{2}}^{-}$ have been observed by terahertz spectroscopy in a cryogenic radio frequency ion trap. Absorption of terahertz photons has been probed by rotational state-dependent photodetachment of the trapped negative ions near the detachment ...

[Phys. Rev. Lett. 120, 253003] Published Fri Jun 22, 2018

]]>Inelastic neutron scattering measurements are performed on single crystals of the antiferromagnetic compound ${\mathrm{Mn}}_{5}{\mathrm{Si}}_{3}$ in order to investigate the relation between the spin dynamics and the magnetothermodynamics properties. It is shown that, among the two stable antiferromagnetic phases of this compoun...

[Phys. Rev. Lett. 120, 257205] Published Fri Jun 22, 2018

]]>The specific heat of the Kondo insulator ${\mathrm{YbB}}_{12}$ has been measured up to 60 T. The Sommerfeld coefficient $\gamma $ significantly increases at around 50 T, where the insulator metal transition occurs with a steep increase of the magnetization. $\gamma $ reaches $67\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{mJ}/(\mathrm{mol}\text{\hspace{0.17em}}{\mathrm{K}}^{2})$ at high fields, which directly indicates...

[Phys. Rev. Lett. 120, 257206] Published Fri Jun 22, 2018

]]>[Phys. Rev. Lett. 120, 259902] Published Fri Jun 22, 2018

]]>Inverted quantum states provide a challenge to classical thermodynamics, since they appear to contradict the classical formulation of the second law of thermodynamics. Ramsey interpreted these states as stable equilibrium states of negative thermodynamic temperature, and added a provision to allow t...

[Phys. Rev. Lett. 120, 250602] Published Thu Jun 21, 2018

]]>We present an interpretation of the time variability of the x-ray flux recently reported from a multiepoch campaign of 15 years of observations of the supernova remnant Cassiopeia A by Chandra. We show for the first time quantitatively that the [4.2–6] keV nonthermal flux increase up to 50% traces t...

[Phys. Rev. Lett. 120, 251101] Published Thu Jun 21, 2018

]]>We present a new proposal to study the helicity-dependent dihadron fragmentation functions (DiFF), which describe the correlations of the longitudinal polarization of a fragmenting quark with the transverse momenta of the produced hadron pair. Recent experimental searches for this DiFF via azimuthal...

[Phys. Rev. Lett. 120, 252001] Published Thu Jun 21, 2018

]]>An experimental method has been developed to locate unstable equilibria of nonlinear structures quasistatically. The technique involves loading a structure by the application of either a force or a displacement at a main actuation point while simultaneously controlling the overall shape using additi...

[Phys. Rev. Lett. 120, 254101] Published Thu Jun 21, 2018

]]>Recent progress in laser-driven plasma acceleration now enables the acceleration of electrons to several gigaelectronvolts. Taking advantage of these novel accelerators, ultrashort, compact, and spatially coherent x-ray sources called betatron radiation have been developed and applied to high-resolu...

[Phys. Rev. Lett. 120, 254802] Published Thu Jun 21, 2018

]]>In order to realize superconductivity in cuprates with the ${T}^{\prime}$-type structure, not only chemical substitution (Ce doping) but also postgrowth reduction annealing is necessary. In the case of thin films, however, well-designed reduction annealing alone without Ce doping can induce superconductivity in...

[Phys. Rev. Lett. 120, 257001] Published Thu Jun 21, 2018

]]>We observe and explain theoretically strain-induced spin-wave routing in the bilateral composite multilayer. By means of Brillouin light scattering and microwave spectroscopy, we study the spin-wave transport across three adjacent magnonic stripes, which are strain coupled to a piezoelectric layer. ...

[Phys. Rev. Lett. 120, 257203] Published Thu Jun 21, 2018

]]>Neural-network-based machine learning is emerging as a powerful tool for obtaining phase diagrams when traditional regression schemes using local equilibrium order parameters are not available, as in many-body localized (MBL) or topological phases. Nevertheless, instances of machine learning offerin...

[Phys. Rev. Lett. 120, 257204] Published Thu Jun 21, 2018

]]>We develop a general microscopic theory describing the phonon decoherence of quantum dots and indistinguishability of the emitted photons in photonic structures. The coherence is found to depend fundamentally on the dimensionality of the structure resulting in vastly different performance for quantu...

[Phys. Rev. Lett. 120, 257401] Published Thu Jun 21, 2018

]]>Dirac semimetals possess Fermi-arc surface states, which will be a set of discrete surface subbands in a nanowire due to the quantum confinement effect. Here, we report a tunable Fano effect induced by the interference between the discrete surface states and continuous bulk states of a Dirac semimet...

[Phys. Rev. Lett. 120, 257701] Published Thu Jun 21, 2018

]]>Line failures can emerge and propagate in power grids because of varying power injections such as those from wind and solar plants.

[Phys. Rev. Lett. 120, 258301] Published Thu Jun 21, 2018

]]>We introduce a novel transition path (TPS) sampling scheme employing nested sampling. Analogous to how nested sampling explores the entire configurational phase space for atomistic systems, nested TPS samples the entire available trajectory space in one simulation. Thermodynamic and path observables...

[Phys. Rev. Lett. 120, 250601] Published Wed Jun 20, 2018

]]>Detecting neutral hydrogen (H i) via the 21 cm line emission from the intergalactic medium at $z\gtrsim 6$ has been identified as one of the most promising probes of the epoch of cosmic reionization—a major phase transition of the Universe. However, these studies face severe challenges imposed by the bright ...

[Phys. Rev. Lett. 120, 251301] Published Wed Jun 20, 2018

]]>A method is presented to monitor the internal energy distribution of cluster anions via delayed electron detachment by pulsed photoexcitation and demonstrated on ${\mathrm{Co}}_{4}^{-}$ in an electrostatic ion beam trap. In a cryogenic operation, we calibrate the detachment delay to internal energy. By laser frequency...

[Phys. Rev. Lett. 120, 253001] Published Wed Jun 20, 2018

]]>The vast majority of physical objects we are dealing with are almost exclusively made of atoms. Because of their discrete level structure, single atoms have proved to be emitters of light, which is incompatible with the classical description of electromagnetic waves. We demonstrate this incompatibil...

[Phys. Rev. Lett. 120, 253602] Published Wed Jun 20, 2018

]]>Willis coupling in acoustic materials defines the cross-coupling between strain and velocity, analogous to bianisotropic phenomena in electromagnetics. While these phenomena have been garnering significant attention in recent years, to date their effects have been considered mostly perturbative. Her...

[Phys. Rev. Lett. 120, 254301] Published Wed Jun 20, 2018

]]>A theoretical study of crack propagation provides an explanation for the observed repulsion between certain pairs of cracks on collision courses.

[Phys. Rev. Lett. 120, 255501] Published Wed Jun 20, 2018

]]>Probing the Fermi sea and wave vector of composite fermions address whether they are present, and spin-polarized, in a particular fractional Hall state that is of relevance to topological quantum computing.

[Phys. Rev. Lett. 120, 256601] Published Wed Jun 20, 2018

]]>We introduce and study in two dimensions a new class of dry, aligning active matter that exhibits a direct transition to orientational order, without the phase-separation phenomenology usually observed in this context. Characterized by self-propelled particles with velocity reversals and a ferromagn...

[Phys. Rev. Lett. 120, 258002] Published Wed Jun 20, 2018

]]>[Phys. Rev. Lett. 120, 258901] Published Wed Jun 20, 2018

]]>[Phys. Rev. Lett. 120, 258902] Published Wed Jun 20, 2018

]]>[Phys. Rev. Lett. 120, 259901] Published Wed Jun 20, 2018

]]>We demonstrate the use of a femtosecond frequency comb to coherently drive stimulated Raman transitions between terahertz-spaced atomic energy levels. More specifically, we address the $3d\text{\hspace{0.17em}}{{}^{2}D}_{3/2}$ and $3d\text{\hspace{0.17em}}{{}^{2}D}_{5/2}$ fine structure levels of a single trapped ${}^{40}{\mathrm{Ca}}^{+}$ ion and spectroscopically resolve the transit...

[Phys. Rev. Lett. 120, 253601] Published Tue Jun 19, 2018

]]>We propose a scheme to retrieve the size parameters of a nanoparticle on a glass substrate at a scale much smaller than the wavelength. This is achieved by illuminating the particle using two plane waves to create rich and nontrivial local polarization distributions, and observing the far-field scat...

[Phys. Rev. Lett. 120, 253901] Published Tue Jun 19, 2018

]]>We report on the depletion and power amplification of the driving laser pulse in a strongly driven laser wakefield accelerator. Simultaneous measurement of the transmitted pulse energy and temporal shape indicate an increase in peak power from $187\pm 11\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{TW}$ to a maximum of $318\pm 12\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{TW}$ after 13 mm of pro...

[Phys. Rev. Lett. 120, 254801] Published Tue Jun 19, 2018

]]>We combined scanning tunneling microscopy and locally resolved magnetic stray field measurements on the ferromagnetic semimetal ${\mathrm{EuB}}_{6}$, which exhibits a complex ferromagnetic order and a colossal magnetoresistance effect. In a zero magnetic field, scanning tunneling spectroscopy visualizes the existen...

[Phys. Rev. Lett. 120, 257201] Published Tue Jun 19, 2018

]]>We present the discovery and refinement by neutron powder diffraction of a new magnetic phase in the ${\mathrm{Na}}_{1-x}{\mathrm{Ca}}_{x}{\mathrm{Mn}}_{7}{\mathrm{O}}_{12}$ quadruple perovskite phase diagram, which is the incommensurate analogue of the well-known pseudo-CE phase of the simple perovskite manganites. We demonstrate that incommensurate magne...

[Phys. Rev. Lett. 120, 257202] Published Tue Jun 19, 2018

]]>We demonstrate that multipartite entanglement is able to characterize one-dimensional symmetry-protected topological order, which is witnessed by the scaling behavior of the quantum Fisher information of the ground state with respect to the spin operators defined in the dual lattice. We investigate ...

[Phys. Rev. Lett. 120, 250501] Published Mon Jun 18, 2018

]]>Since the first observation of odd and even high-order harmonics generated from ZnO crystals in 2011, the dependence of the harmonic yields on the orientation of the laser polarization with respect to the crystal axis has never been properly interpreted. This failure has been traced to the lack of a...

[Phys. Rev. Lett. 120, 253201] Published Mon Jun 18, 2018

]]>Resonant light scattering by metallic and high-index dielectric nanoparticles has received enormous attention and found many great applications. However, low-index dielectric nanoparticles typically do not show resonant scattering behaviors due to poor light confinement caused by small index contras...

[Phys. Rev. Lett. 120, 253902] Published Mon Jun 18, 2018

]]>A new phase V of hydrogen was recently claimed in experiments above 325 GPa and 300 K. Because of the extremely small sample size at such record pressures the measurements were limited to Raman spectroscopy. The experimental data on increase of pressure show decreasing Raman activity and darkening o...

[Phys. Rev. Lett. 120, 255701] Published Mon Jun 18, 2018

]]>We show that nanoparticles can have very rich ground-state chemical order. This is illustrated by determining the chemical ordering of Ag-Au 309-atom Mackay icosahedral nanoparticles. The energy of the nanoparticles is described using a cluster expansion model, and a mixed integer programming approa...

[Phys. Rev. Lett. 120, 256101] Published Mon Jun 18, 2018

]]>A new statistical model predicts the evolving shape of a cellular membrane by accounting for the active feedback between the membrane and attached proteins.

[Phys. Rev. Lett. 120, 258001] Published Mon Jun 18, 2018

]]>In a general, multimode scattering setup, we show how the permutation symmetry of a many-particle input state determines those scattering unitaries that exhibit strictly suppressed many-particle transition events. We formulate purely algebraic suppression laws that identify these events and show tha...

[Phys. Rev. Lett. 120, 240404] Published Fri Jun 15, 2018

]]>Machine learning is actively being explored for its potential to design, validate, and even hybridize with near-term quantum devices. A central question is whether neural networks can provide a tractable representation of a given quantum state of interest. When true, stochastic neural networks can b...

[Phys. Rev. Lett. 120, 240503] Published Fri Jun 15, 2018

]]>Nonlinear fluctuating hydrodynamics correctly predicts the long time behavior for multi-component systems.

[Phys. Rev. Lett. 120, 240601] Published Fri Jun 15, 2018

]]>The IceCube neutrino discovery was punctuated by three showers with ${E}_{\nu}\approx 1\u20132\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{PeV}$. Interest is intense in possible fluxes at higher energies, though a deficit of ${E}_{\nu}\approx 6\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{PeV}$ Glashow resonance events implies a spectrum that is soft and/or cutoff below $\sim \text{few}$ PeV. However, IceCube recently reported a throug...

[Phys. Rev. Lett. 120, 241105] Published Fri Jun 15, 2018

]]>Quantum chaos is one of the distinctive features of the Sachdev-Ye-Kitaev (SYK) model, $N$ Majorana fermions in $0+1$ dimensions with infinite-range two-body interactions, which is attracting a lot of interest as a toy model for holography. Here we show analytically and numerically that a generalized SY...

[Phys. Rev. Lett. 120, 241603] Published Fri Jun 15, 2018

]]>We observe coherent spin exchange between identical electronic spins in the solid state, a key step towards full quantum control of electronic spin registers in room temperature solids. In a diamond substrate, a single nitrogen vacancy (NV) center coherently couples to two adjacent $S=1/2$ dark electr...

[Phys. Rev. Lett. 120, 243604] Published Fri Jun 15, 2018

]]>Optical helicity density is usually discussed for monochromatic electromagnetic fields in free space. It plays an important role in the interaction with chiral molecules or nanoparticles. Here we introduce the optical helicity density in a dispersive isotropic medium. Our definition is consistent wi...

[Phys. Rev. Lett. 120, 243605] Published Fri Jun 15, 2018

]]>We study the propagation of surface plasmon polaritons (SPPs) on a metal surface which hosts a thin film of a liquid dielectric. The Ohmic losses that are inherently present due to the coupling of SPPs to conductors’ electron plasma, induce temperature gradients and fluid deformation driven by the t...

[Phys. Rev. Lett. 120, 243904] Published Fri Jun 15, 2018

]]>There are currently three main classes of liquid-repellent surfaces: micro- or nanostructured superhydrophobic surfaces, flat surfaces grafted with “liquidlike” polymer brushes, and lubricated surfaces. Despite recent progress, the mechanistic explanation for the differences in droplet behavior on s...

[Phys. Rev. Lett. 120, 244503] Published Fri Jun 15, 2018

]]>We perform three-dimensional particle tracking measurements on droplets in a turbulent airflow. The droplets display the well-known preferential concentration of inertial particles, with an additional extreme clustering at the smallest scales. We explain this additional clustering phenomenon theoret...

[Phys. Rev. Lett. 120, 244504] Published Fri Jun 15, 2018

]]>2D simulations of the atmosphere, with few assumptions, can generate a slowly oscillating, tropical wind pattern that has been puzzling to atmospheric scientists.

[Phys. Rev. Lett. 120, 244505] Published Fri Jun 15, 2018

]]>We investigate the interplay between charge order and superconductivity near an antiferromagnetic quantum critical point using sign-problem-free Quantum Monte Carlo simulations. We establish that, when the electronic dispersion is particle-hole symmetric, the system has an emergent SU(2) symmetry th...

[Phys. Rev. Lett. 120, 247002] Published Fri Jun 15, 2018

]]>We show that the ${Z}_{N}$ Berry phase (Berry phase quantized into $2\pi /N$) provides a useful tool to characterize symmetry protected topological phases with correlation that can be directly computed through numerics of a relatively small system size. The ${Z}_{N}$ Berry phase is defined in a $N-1$-dimensional paramet...

[Phys. Rev. Lett. 120, 247202] Published Fri Jun 15, 2018

]]>Cluster morphology of spherical particles interacting with a short-range attraction has been extensively studied due to its relevance to many applications, such as the large-scale structure in amorphous materials, phase separation, protein aggregation, and organelle formation in cells. Although it w...

[Phys. Rev. Lett. 120, 248004] Published Fri Jun 15, 2018

]]>Machine learning, the core of artificial intelligence and big data science, is one of today’s most rapidly growing interdisciplinary fields. Recently, machine learning tools and techniques have been adopted to tackle intricate quantum many-body problems. In this Letter, we introduce machine learning...

[Phys. Rev. Lett. 120, 240402] Published Thu Jun 14, 2018

]]>Typical elements of quantum networks are made by identical systems, which are the basic particles constituting a resource for quantum information processing. Whether the indistinguishability due to particle identity is an exploitable quantum resource remains an open issue. Here we study independentl...

[Phys. Rev. Lett. 120, 240403] Published Thu Jun 14, 2018

]]>A proposal for a new test of the equivalence principle for ordinary matter falling toward galactic dark matter involves using radio pulsars.

[Phys. Rev. Lett. 120, 241104] Published Thu Jun 14, 2018

]]>Using a low background data sample of $9.7\times {10}^{5}\text{\hspace{0.17em}}\text{\hspace{0.17em}}J/\psi \to \gamma {\eta}^{\prime}$, ${\eta}^{\prime}\to \gamma {\pi}^{+}{\pi}^{-}$ events, which are 2 orders of magnitude larger than those from the previous experiments, recorded with the BESIII detector at BEPCII, the decay dynamics of ${\eta}^{\prime}\to \gamma {\pi}^{+}{\pi}^{-}$ are studied with both model-dependent and model-independent approaches...

[Phys. Rev. Lett. 120, 242003] Published Thu Jun 14, 2018

]]>We show that a system of three species of one-dimensional fermions, with an attractive three-body contact interaction, features a scale anomaly directly related to the anomaly of two-dimensional fermions with two-body contact forces. We show, furthermore, that those two cases (and their multispecies...

[Phys. Rev. Lett. 120, 243002] Published Thu Jun 14, 2018

]]>Accessing new regimes in quantum simulation requires the development of new techniques for quantum state preparation. We demonstrate the quantum state engineering of a strongly correlated many-body state of the two-component repulsive Fermi-Hubbard model on a square lattice. Our scheme makes use of ...

[Phys. Rev. Lett. 120, 243201] Published Thu Jun 14, 2018

]]>The use of entangled states was shown to improve the fundamental limits of spectroscopy to beyond the standard-quantum limit. Here, rather than probing the free evolution of the phase of an entangled state with respect to a local oscillator, we probe the evolution of an initially separable two-atom ...

[Phys. Rev. Lett. 120, 243603] Published Thu Jun 14, 2018

]]>A series of cryogenic, layered deuterium-tritium (DT) implosions have produced, for the first time, fusion energy output twice the peak kinetic energy of the imploding shell. These experiments at the National Ignition Facility utilized high density carbon ablators with a three-shock laser pulse (1.5...

[Phys. Rev. Lett. 120, 245003] Published Thu Jun 14, 2018

]]>Using the transversal vibration resonance of a suspended carbon nanotube as a charge detector for its embedded quantum dot, we investigate the case of strong Kondo correlations between a quantum dot and its leads. We demonstrate that even when large Kondo conductance is carried at odd electron numbe...

[Phys. Rev. Lett. 120, 246802] Published Thu Jun 14, 2018

]]>A significantly enhanced Meissner effect is found in copper-coated niobium film as well as in copper-niobium-cobalt heterostructures.

[Phys. Rev. Lett. 120, 247001] Published Thu Jun 14, 2018

]]>We study a continuum of photonic quasicrystal heterostructures derived from local isomorphism (LI) classes of pentagonal quasicrystal tilings. These tilings are obtained by direct projection from a five-dimensional hypercubic lattice. We demonstrate that, with the sole exception of the Penrose LI cl...

[Phys. Rev. Lett. 120, 247401] Published Thu Jun 14, 2018

]]>By applying measurements of the dielectric constants and relative length changes to the dimerized molecular conductor $\kappa \text{\u2212}(\mathrm{BEDT}\text{\u2212}\mathrm{TTF}{)}_{2}\mathrm{Hg}(\mathrm{SCN}{)}_{2}\mathrm{Cl}$, we provide evidence for order-disorder type electronic ferroelectricity that is driven by the charge order within the $(\mathrm{BEDT}\text{\u2212}\mathrm{TTF}{)}_{2}$ dimers and stabilized by a ...

[Phys. Rev. Lett. 120, 247601] Published Thu Jun 14, 2018

]]>We analyze the measured optical conductivity spectra using the density-functional-theory-based electronic structure calculation and density-matrix renormalization group calculation of an effective model. We show that, in contrast to a conventional description, the Bose-Einstein condensation of prefo...

[Phys. Rev. Lett. 120, 247602] Published Thu Jun 14, 2018

]]>The emergence of large-scale connectivity underlies the proper functioning of many networked systems, ranging from social networks and technological infrastructure to global trade networks. Percolation theory characterizes network formation following stochastic local rules, while optimization models...

[Phys. Rev. Lett. 120, 248302] Published Thu Jun 14, 2018

]]>Simulations suggest that the gamma rays accompanying the neutron star merger detected in 2017 came from a short gamma-ray burst viewed at a 30° angle.

[Phys. Rev. Lett. 120, 241103] Published Wed Jun 13, 2018

]]>We present a measurement of the effective weak mixing angle parameter ${\mathrm{sin}}^{2}{\theta}_{\text{eff}}^{\ell}$ in $p\overline{p}\to Z/{\gamma}^{*}\to {\mu}^{+}{\mu}^{-}$ events at a center-of-mass energy of 1.96 TeV, collected by the D0 detector at the Fermilab Tevatron Collider and corresponding to $8.6\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{fb}}^{-1}$ of integrated luminosity. The measured value of ${\mathrm{sin}}^{2}{\theta}_{\text{eff}}^{\ell}[\mu \mu ]=\mathrm{...}$

[Phys. Rev. Lett. 120, 241802] Published Wed Jun 13, 2018

]]>We probe the interface between a phase-separated Bose-Fermi mixture consisting of a small Bose-Einstein condensate of ${}^{41}\mathrm{K}$ residing in a large Fermi sea of ${}^{6}\mathrm{Li}$. We quantify the residual spatial overlap between the two components by measuring three-body recombination losses for variable strength of th...

[Phys. Rev. Lett. 120, 243403] Published Wed Jun 13, 2018

]]>The Kuramoto model (KM) is a theoretical paradigm for investigating the emergence of rhythmic activity in large populations of oscillators. A remarkable example of rhythmogenesis is the feedback loop between excitatory ($E$) and inhibitory ($I$) cells in large neuronal networks. Yet, although the $EI$-fee...

[Phys. Rev. Lett. 120, 244101] Published Wed Jun 13, 2018

]]>A new effective Hamiltonian for the disordered one-dimensional Hubbard model answers the question why charges, but not spins, are localized in this model.

[Phys. Rev. Lett. 120, 246602] Published Wed Jun 13, 2018

]]>The recent discovery of triply degenerate points (TDPs) in topological materials has opened a new perspective toward the realization of novel quasiparticles without counterparts in quantum field theory. The emergence of such protected nodes is often attributed to spin-vector-momentum couplings. We s...

[Phys. Rev. Lett. 120, 240401] Published Tue Jun 12, 2018

]]>The gravitational wave event GW170817 together with its electromagnetic counterparts constrains the speed of gravity to be extremely close to that of light. We first show, on the example of an exact Schwarzschild–de Sitter solution of a specific beyond-Horndeski theory, that imposing the strict equa...

[Phys. Rev. Lett. 120, 241101] Published Tue Jun 12, 2018

]]>We explore the possible spectrum of binary mergers of subsolar mass black holes formed out of dark matter particles interacting via a dark electromagnetism. We estimate the properties of these dark black holes by assuming that their formation process is parallel to Population-III star formation, exc...

[Phys. Rev. Lett. 120, 241102] Published Tue Jun 12, 2018

]]>We report the first results of a light weakly interacting massive particles (WIMPs) search from the CDEX-10 experiment with a 10 kg germanium detector array immersed in liquid nitrogen at the China Jinping Underground Laboratory with a physics data size of 102.8 kg day. At an analysis threshold of 1...

[Phys. Rev. Lett. 120, 241301] Published Tue Jun 12, 2018

]]>Inspired by a text-mining technique, scientists have developed a more direct way to distinguish quark jets from gluon jets in high-energy particle collisions.

[Phys. Rev. Lett. 120, 241602] Published Tue Jun 12, 2018

]]>We demonstrate that the diffusion currents do not depend only on gradients of their corresponding charge density, but that the different diffusion charge currents are coupled. This happens in such a way that it is possible for density gradients of a given charge to generate dissipative currents of a...

[Phys. Rev. Lett. 120, 242301] Published Tue Jun 12, 2018

]]>Ongoing developments in ultrafast x-ray sources offer powerful new means of probing the complex nonadiabatically coupled structural and electronic dynamics of photoexcited molecules. These non-Born-Oppenheimer effects are governed by general electronic degeneracies termed conical intersections, whic...

[Phys. Rev. Lett. 120, 243001] Published Tue Jun 12, 2018

]]>Measurements of the collective Lamb shift in a nanolayer of potassium atoms confined between two sapphire windows show that the usual electrodynamics for light in a medium does not explain their observations.

[Phys. Rev. Lett. 120, 243401] Published Tue Jun 12, 2018

]]>We investigate the universal thermodynamics of the two-component one-dimensional Bose gas with contact interactions in the vicinity of the quantum critical point separating the vacuum and the ferromagnetic liquid regime. We find that the quantum critical region belongs to the universality class of t...

[Phys. Rev. Lett. 120, 243402] Published Tue Jun 12, 2018

]]>The insertion of a local magnetic flux, as the one created by a thin solenoid, plays an important role in gedanken experiments of quantum Hall physics. By combining Floquet engineering of artificial magnetic fields with the ability of single-site addressing in quantum gas microscopes, we propose a s...

[Phys. Rev. Lett. 120, 243602] Published Tue Jun 12, 2018

]]>X-ray diffraction from molecules in the ground state produces an image of their charge density, and time-resolved x-ray diffraction can thus monitor the motion of the nuclei. However, the density change of excited valence electrons upon optical excitation can barely be monitored with regular diffrac...

[Phys. Rev. Lett. 120, 243902] Published Tue Jun 12, 2018

]]>The polarization property of high harmonics from gallium selenide is investigated using linearly polarized midinfrared laser pulses. With a high electric field, the perpendicular polarization component of the odd harmonics emerges, which is not present with a low electric field and cannot be explain...

[Phys. Rev. Lett. 120, 243903] Published Tue Jun 12, 2018

]]>Interscale interaction between small-scale structures near the wall and large-scale structures away from the wall plays an increasingly important role with increasing Reynolds number in wall-bounded turbulence. While the top-down influence from the large- to small-scale structures is well known, it ...

[Phys. Rev. Lett. 120, 244501] Published Tue Jun 12, 2018

]]>We present a generalization of turbulent pair dispersion to large initial separations ($\eta <{r}_{0}<L$), by introducing a new time scale, ${\tau}_{{v}_{0}}$, that reflects the persistence of initial conditions at time $\tau =0$. Results of 3D Lagrangian tracking experiments at moderate Reynolds numbers show that pairs, for...

[Phys. Rev. Lett. 120, 244502] Published Tue Jun 12, 2018

]]>The hysteresis relation between turbulence and temperature modulation during the heat pulse propagation into a magnetic island is studied for the first time in toroidal plasmas. Lissajous curves of the density fluctuation ($\tilde{n}/n$) and the electron temperature (${T}_{e}$) modulation show that the ($\tilde{n}/n$) propa...

[Phys. Rev. Lett. 120, 245001] Published Tue Jun 12, 2018

]]>We study the stability of current filaments produced by the Weibel, or current filamentation, instability in weakly magnetized counterstreaming plasmas. It is shown that a resonance exists between the current-carrying ions and a longitudinal drift-kink mode that strongly deforms and eventually break...

[Phys. Rev. Lett. 120, 245002] Published Tue Jun 12, 2018

]]>The total energy of acoustic emission (AE) events in externally stressed materials diverges when approaching macroscopic failure. Numerical and conceptual models explain this accelerated seismic release (ASR) as the approach to a critical point that coincides with ultimate failure. Here, we report A...

[Phys. Rev. Lett. 120, 245501] Published Tue Jun 12, 2018

]]>Compressive strain relaxation of a chemical vapor deposition (CVD) grown graphene overlayer has been considered to be the main driving force behind metal surface step bunching (SB) in CVD graphene growth. Here, by combining theoretical studies with experimental observations, we prove that the SB can...

[Phys. Rev. Lett. 120, 246101] Published Tue Jun 12, 2018

]]>Time-domain techniques have shown the potential of photomanipulating existing orders and inducing new states of matter in strongly correlated materials. Using time-resolved exact diagonalization, we perform numerical studies of pump dynamics in a Mott-Peierls system with competing charge and spin de...

[Phys. Rev. Lett. 120, 246402] Published Tue Jun 12, 2018

]]>The valley can serve as a new degree of freedom in the manipulation of particles or waves in condensed matter physics, whereas systems containing combinations of gain and loss elements constitute rich building units that can mimic non-Hermitian properties. By introducing gain and loss in artificial ...

[Phys. Rev. Lett. 120, 246601] Published Tue Jun 12, 2018

]]>Combining concepts of semiconductor physics and corrosion science, we develop a novel approach that allows us to perform *ab initio* calculations under controlled potentiostat conditions for electrochemical systems. The proposed approach can be straightforwardly applied in standard density functional ...

[Phys. Rev. Lett. 120, 246801] Published Tue Jun 12, 2018

]]>We study the excitation spectrum in the dimer phase of the Shastry-Sutherland model by using an unbiased variational method that works in the thermodynamic limit. The method outputs dynamical correlation functions in all possible channels. This output is exploited to identify the order parameters wi...

[Phys. Rev. Lett. 120, 247201] Published Tue Jun 12, 2018

]]>Active stresses can cause instabilities in contractile gels and living tissues. Here we provide a generic hydrodynamic theory that treats these systems as a mixture of two phases of varying activity and different mechanical properties. We find that differential activity between the phases causes a u...

[Phys. Rev. Lett. 120, 248003] Published Tue Jun 12, 2018

]]>The function space of deep-learning machines is investigated by studying growth in the entropy of functions of a given error with respect to a reference function, realized by a deep-learning machine. Using physics-inspired methods we study both sparsely and densely connected architectures to discove...

[Phys. Rev. Lett. 120, 248301] Published Tue Jun 12, 2018

]]>Quantum information technologies provide promising applications in communication and computation, while machine learning has become a powerful technique for extracting meaningful structures in “big data.” A crossover between quantum information and machine learning represents a new interdisciplinary...

[Phys. Rev. Lett. 120, 240501] Published Mon Jun 11, 2018

]]>Stochastic processes are as ubiquitous throughout the quantitative sciences as they are notorious for being difficult to simulate and predict. In this Letter, we propose a unitary quantum simulator for discrete-time stochastic processes which requires less internal memory than any classical analogue...

[Phys. Rev. Lett. 120, 240502] Published Mon Jun 11, 2018

]]>We study the quantum field theory of a charged ${\varphi}^{4}$ field in lattice regularization at finite density and low temperature in 2 and 4 dimensions with the goal of analyzing the connection of condensation phenomena to scattering data in a nonperturbative way. The sign problem of the theory at nonzero che...

[Phys. Rev. Lett. 120, 241601] Published Mon Jun 11, 2018

]]>A search for physics beyond the standard model in events with one or more high-momentum Higgs bosons, $H$, decaying to pairs of $b$ quarks in association with missing transverse momentum is presented. The data, corresponding to an integrated luminosity of $35.9\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{fb}}^{-1}$, were collected with the CMS detector...

[Phys. Rev. Lett. 120, 241801] Published Mon Jun 11, 2018

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