We show a surprising link between experimental setups to realize high-dimensional multipartite quantum states and graph theory. In these setups, the paths of photons are identified such that the photon-source information is never created. We find that each of these setups corresponds to an undirecte...

[Phys. Rev. Lett. 119, 240403] Published Fri Dec 15, 2017

]]>We study the continuous one-dimensional hard-sphere model and present irreversible local Markov chains that mix on faster time scales than the reversible heat bath or Metropolis algorithms. The mixing time scales appear to fall into two distinct universality classes, both faster than for reversible ...

[Phys. Rev. Lett. 119, 240603] Published Fri Dec 15, 2017

]]>Using cosmic-ray boron to carbon ratio (B/C) data recently released by the Ams-02 experiment, we find indications (*decisive evidence*, in Bayesian terms) in favor of a diffusive propagation origin for the broken power-law spectra found in protons ($p$) and helium nuclei (He). The result is robust with ...

[Phys. Rev. Lett. 119, 241101] Published Fri Dec 15, 2017

]]>We report a precise measurement of the $J/\psi $ elliptic flow in Pb-Pb collisions at $\sqrt{{s}_{NN}}=5.02\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{TeV}$ with the ALICE detector at the LHC. The $J/\psi $ mesons are reconstructed at midrapidity ($|y|<0.9$) in the dielectron decay channel and at forward rapidity ($2.5<y<4.0$) in the dimuon channel, both down to...

[Phys. Rev. Lett. 119, 242301] Published Fri Dec 15, 2017

]]>Higher neutrino emission is found from core-collapse supernova when muons are included in numerical simulations.

[Phys. Rev. Lett. 119, 242702] Published Fri Dec 15, 2017

]]>The tunneling site of the electron in a molecule exposed to a strong laser field determines the initial position of the ionizing electron and, as a result, has a large impact on the subsequent ultrafast electron dynamics on the polyatomic Coulomb potential. Here, the tunneling site of the electron o...

[Phys. Rev. Lett. 119, 243204] Published Fri Dec 15, 2017

]]>A specially-designed cryostat allows a silicon cavity operating at 4K to reach an instability ten times more stable and a linewith ten thousand times narrower than previous sub-10K systems.

[Phys. Rev. Lett. 119, 243601] Published Fri Dec 15, 2017

]]>Traditional optical imaging faces an unavoidable trade-off between resolution and depth of field (DOF). To increase resolution, high numerical apertures (NAs) are needed, but the associated large angular uncertainty results in a limited range of depths that can be put in sharp focus. Plenoptic imagi...

[Phys. Rev. Lett. 119, 243602] Published Fri Dec 15, 2017

]]>A theoretical description of twisted (vortex) electrons interacting with electric and magnetic fields is presented, based on Lorentz transformations. The general dynamical equations of motion of a twisted electron with an intrinsic orbital angular momentum in an external field are derived. Methods f...

[Phys. Rev. Lett. 119, 243903] Published Fri Dec 15, 2017

]]>In this work, we study the transmission properties of one-dimensional finite periodic systems with $\mathcal{P}\mathcal{T}$ symmetry. A simple closed-form expression is obtained for the total transmittance from a lattice of $N$ cells, that allows us to describe the transmission minima (maxima) when the system is in the $\mathcal{P}\mathcal{T}$-...

[Phys. Rev. Lett. 119, 243904] Published Fri Dec 15, 2017

]]>A chiral spin liquid is predicted to be realizable in a simple time-reversal-invariant Kondo-Heisenberg model.

[Phys. Rev. Lett. 119, 247203] Published Fri Dec 15, 2017

]]>We show how to realize two-component fractional quantum Hall phases in monolayer graphene by optically driving the system. A laser is tuned into resonance between two Landau levels, giving rise to an effective tunneling between these two synthetic layers. Remarkably, because of this coupling, the in...

[Phys. Rev. Lett. 119, 247403] Published Fri Dec 15, 2017

]]>We study the dynamics of excitonic insulators coupled to phonons using the time-dependent mean-field theory. Without phonon couplings, the linear response is given by the damped amplitude oscillations of the order parameter with a frequency equal to the minimum band gap. A phonon coupling to the int...

[Phys. Rev. Lett. 119, 247601] Published Fri Dec 15, 2017

]]>The entropic lattice Boltzmann model (ELBM), a discrete space-time kinetic theory for hydrodynamics, ensures nonlinear stability via the discrete time version of the second law of thermodynamics (the $H$ theorem). Compliance with the $H$ theorem is numerically enforced in this methodology and involves a...

[Phys. Rev. Lett. 119, 240602] Published Thu Dec 14, 2017

]]>The top quark—previously seen in proton collisions—has now been identified in collisions between protons and lead nuclei.

[Phys. Rev. Lett. 119, 242001] Published Thu Dec 14, 2017

]]>Despite the simplicity of its molecular unit, water is a challenging system because of its uniquely rich polymorphism and predicted but yet unconfirmed features. Introducing a novel space of generalized coordinates that capture changes in the topology of the interatomic network, we are able to syste...

[Phys. Rev. Lett. 119, 245701] Published Thu Dec 14, 2017

]]>We present a theoretical analysis of two-dimensional Dirac-Rashba systems in the presence of disorder and external perturbations. We unveil a set of exact symmetry relations (Ward identities) that impose strong constraints on the spin dynamics of Dirac fermions subject to proximity-induced interacti...

[Phys. Rev. Lett. 119, 246801] Published Thu Dec 14, 2017

]]>Eukaryotic cells sense molecular gradients by measuring spatial concentration variation through the difference in the number of occupied receptors to which molecules can bind. They also secrete enzymes that degrade these molecules, and it is presently not well understood how this affects the local g...

[Phys. Rev. Lett. 119, 248101] Published Thu Dec 14, 2017

]]>In network systems, a local perturbation can amplify as it propagates, potentially leading to a large-scale cascading failure. Here we derive a continuous model to advance our understanding of cascading failures in power-grid networks. The model accounts for both the failure of transmission lines *an...*

[Phys. Rev. Lett. 119, 248302] Published Thu Dec 14, 2017

]]>Two proposals describe how to test whether gravity is inherently quantum by measuring the entanglement between two masses.

[Phys. Rev. Lett. 119, 240401] Published Wed Dec 13, 2017

]]>Two proposals describe how to test whether gravity is inherently quantum by measuring the entanglement between two masses.

[Phys. Rev. Lett. 119, 240402] Published Wed Dec 13, 2017

]]>We study an analog quantum simulator coupled to a reservoir with a known spectral density. The reservoir perturbs the quantum simulation by causing decoherence. The simulator is used to measure an operator average, which cannot be calculated using any classical means. Since we cannot predict the res...

[Phys. Rev. Lett. 119, 240502] Published Wed Dec 13, 2017

]]>Thermodynamics is usually formulated on the presumption that the observer has complete information about the system he or she deals with: no parasitic current, exact evaluation of the forces that drive the system. For example, the acclaimed fluctuation relation (FR), relating the probability of time...

[Phys. Rev. Lett. 119, 240601] Published Wed Dec 13, 2017

]]>We construct a four-dimensional SU(5) grand unified theory in which the proton is stable. The standard model leptons reside in the 5 and 10 irreps of SU(5), whereas the quarks live in the 40 and 50 irreps. The SU(5) gauge symmetry is broken by the vacuum expectation values of the scalar 24 and 75 ir...

[Phys. Rev. Lett. 119, 241801] Published Wed Dec 13, 2017

]]>Ensemble density functional theory is a promising method for the efficient and accurate calculation of excitations of quantum systems, at least if useful functionals can be developed to broaden its domain of practical applicability. Here, we introduce a guaranteed single-valued “Hartree-exchange” en...

[Phys. Rev. Lett. 119, 243001] Published Wed Dec 13, 2017

]]>The ionization rate of an atom in a strong optical field can be resonantly enhanced by the presence of long-living atomic levels (so-called Freeman resonances). This process is most prominent in the multiphoton ionization regime, meaning that the ionization event takes many optical cycles. Neverthel...

[Phys. Rev. Lett. 119, 243202] Published Wed Dec 13, 2017

]]>In this Letter, we propose a novel laser-induced inelastic diffraction (LIID) scheme based on the intense-field-driven atomic nonsequential double ionization (NSDI) process and demonstrate that, with this LIID approach, the doubly differential cross sections (DDCSs) of the target ions, e.g., ${\mathrm{Ar}}^{+}$ and...

[Phys. Rev. Lett. 119, 243203] Published Wed Dec 13, 2017

]]>Recent progress in nanoscale optical physics is associated with the development of a new branch of nanophotonics exploring strong Mie resonances in dielectric nanoparticles with a high refractive index. The high-index resonant dielectric nanostructures form building blocks for novel photonic metadev...

[Phys. Rev. Lett. 119, 243901] Published Wed Dec 13, 2017

]]>We derive an exact and robust stimulated Raman process for nonlinear quantum systems driven by pulsed external fields. The external fields are designed with closed-form expressions from the inverse engineering of a given efficient and stable dynamics. This technique allows one to induce a controlled...

[Phys. Rev. Lett. 119, 243902] Published Wed Dec 13, 2017

]]>The defining property of chimera states is the coexistence of coherent and incoherent domains in systems that are structurally and spatially homogeneous. The recent realization that such states might be common in oscillator networks raises the question of whether an analogous phenomenon can occur in...

[Phys. Rev. Lett. 119, 244101] Published Wed Dec 13, 2017

]]>The exact distribution of the experimentally inaccessible off-diagonal cross sections of scattering in quantum chaotic systems are calculated analytically, solving an old problem in compound nucleus scattering.

[Phys. Rev. Lett. 119, 244102] Published Wed Dec 13, 2017

]]>The beam hosing instability is analyzed theoretically for a witness beam in the quasilinear regime of plasma accelerators. In this regime, the hosing instability saturates, even for a monoenergetic bunch, at a level much less than standard scalings predict. Analytic expressions are derived for the s...

[Phys. Rev. Lett. 119, 244801] Published Wed Dec 13, 2017

]]>The many body localization (MBL) of spin-$\frac{1}{2}$ fermions poses a challenging problem. It is known that the disorder in the charge sector may be insufficient to cause full MBL. Here, we study dynamics of a single hole in one dimensional $t\text{\u2212}J$ model subject to a random magnetic field. We show that strong di...

[Phys. Rev. Lett. 119, 246601] Published Wed Dec 13, 2017

]]>Thin films of amorphous indium oxide undergo a magnetic field driven superconducting to insulator quantum phase transition. In the insulating phase, the current-voltage characteristics show large current discontinuities due to overheating of electrons. We show that the onset voltage for the disconti...

[Phys. Rev. Lett. 119, 247001] Published Wed Dec 13, 2017

]]>We study the topological properties of magnon excitations in three-dimensional antiferromagnets, where the ground state configuration is invariant under time reversal followed by space inversion ($PT$ symmetry). We prove that Dirac points and nodal lines, the former being the limiting case of the latt...

[Phys. Rev. Lett. 119, 247202] Published Wed Dec 13, 2017

]]>We report a systematic plasmonic study of twisted bilayer graphene (TBLG)—two graphene layers stacked with a twist angle. Through real-space nanoimaging of TBLG single crystals with a wide distribution of twist angles, we find that TBLG supports confined infrared plasmons that are sensitively depend...

[Phys. Rev. Lett. 119, 247402] Published Wed Dec 13, 2017

]]>We report experimental results on the competitive passage of elongated self-propelled vehicles rushing through a constriction. For the chosen experimental conditions, we observe the emergence of intermittencies similar to those reported previously for active matter passing through narrow doors. Note...

[Phys. Rev. Lett. 119, 248301] Published Wed Dec 13, 2017

]]>A new analysis places some of the tightest bounds yet on the mass that magnetic monopoles should have if they exist.

[Phys. Rev. Lett. 119, 241601] Published Tue Dec 12, 2017

]]>Grain boundary (GB) migration controls many forms of microstructural evolution in polycrystalline materials. Recent theory, simulations, and experiments demonstrate that GB migration is controlled by the motion of discrete line defects or disconnections. We present a continuum equation of motion for...

[Phys. Rev. Lett. 119, 246101] Published Tue Dec 12, 2017

]]>Random numbers are required for a variety of applications from secure communications to Monte Carlo simulation. Yet randomness is an asymptotic property, and no output string generated by a physical device can be strictly proven to be random. We report an experimental realization of a quantum random...

[Phys. Rev. Lett. 119, 240501] Published Mon Dec 11, 2017

]]>We have performed a direct measurement of the ${}^{19}\mathrm{Ne}(p,\gamma ){}^{20}\mathrm{Na}$ reaction in inverse kinematics using a beam of radioactive ${}^{19}\mathrm{Ne}$. The key astrophysical resonance in the ${}^{19}\mathrm{Ne}+p$ system has been definitely measured for the first time at ${E}_{\mathrm{c}.\mathrm{m}.}={456}_{-2}^{+5}\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{keV}$ with an associated strength of ${17}_{-5}^{+7}\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{meV}$. The pres...

[Phys. Rev. Lett. 119, 242701] Published Mon Dec 11, 2017

]]>We use orthogonally polarized two-color (OTC) laser pulses to separate quantum paths in the multiphoton ionization of Ar atoms. Our OTC pulses consist of 400 and 800 nm light at a relative intensity ratio of $10:1$. We find a hitherto unobserved interference in the photoelectron momentum distribution,...

[Phys. Rev. Lett. 119, 243201] Published Mon Dec 11, 2017

]]>While a variety of fundamental differences are known to separate two-dimensional (2D) and three-dimensional (3D) fluid flows, it is not well understood how they are related. Conventionally, dimensional reduction is justified by an *a priori* geometrical framework; i.e., 2D flows occur under some geome...

[Phys. Rev. Lett. 119, 244501] Published Mon Dec 11, 2017

]]>The enhancement of mobility at the surface of an amorphous alloy is studied using a combination of molecular dynamic simulations and normal mode analysis of the nonuniform distribution of Debye-Waller factors. The increased mobility at the surface is found to be associated with the appearance of Arr...

[Phys. Rev. Lett. 119, 245501] Published Mon Dec 11, 2017

]]>Theorists have discovered topological insulators that are insulating in their interior and on their surfaces but have conducting channels at corners or along edges.

[Phys. Rev. Lett. 119, 246401] Published Mon Dec 11, 2017

]]>Theorists have discovered topological insulators that are insulating in their interior and on their surfaces but have conducting channels at corners or along edges.

[Phys. Rev. Lett. 119, 246402] Published Mon Dec 11, 2017

]]>We study a class of continuous spin models with bond disorder including the kagome Heisenberg antiferromagnet. For weak disorder strength, we find discrete ground states whose number grows exponentially with system size. These states do not exhibit zero-energy excitations characteristic of highly fr...

[Phys. Rev. Lett. 119, 247201] Published Mon Dec 11, 2017

]]>The generation and recombination dynamics of multiple excitons in nanocrystals (NCs) have attracted much attention from the viewpoints of fundamental physics and device applications. However, the quantum coherence of multiple exciton states in NCs still remains unclear due to a lack of experimental ...

[Phys. Rev. Lett. 119, 247401] Published Mon Dec 11, 2017

]]>Aromatic $\pi \text{\u2212}\pi $ interactions between phenyl groups of adjacent chains in poly(4-vinylbiphenyl) (PVBP) have profound effects on the dynamics of this polymer. We report two unexpected nonlinear viscoelastic responses of PVBP when subjected to uniaxial flow. One is the unprecedented observation of extensi...

[Phys. Rev. Lett. 119, 247801] Published Mon Dec 11, 2017

]]>Four decades ago a seminal review by Jonscher [Nature (London) **267**, 673 (1977)] revealed that the dielectric response of conducting materials is characterized by a “remarkable universality”. Demonstrating that the same response pattern is exhibited also by shear rheological spectra of nonpolymeric v...

[Phys. Rev. Lett. 119, 248001] Published Mon Dec 11, 2017

]]>We demonstrate quantum entanglement of two trapped atomic ion qubits using a sequence of ultrafast laser pulses. Unlike previous demonstrations of entanglement mediated by the Coulomb interaction, this scheme does not require confinement to the Lamb-Dicke regime and can be less sensitive to ambient ...

[Phys. Rev. Lett. 119, 230501] Published Fri Dec 08, 2017

]]>We study the sequential breakup of $E/A=24.0\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{MeV}$ ${}^{7}\mathrm{Li}$ projectiles excited through inelastic interactions with C, Be, and Al target nuclei. For peripheral events that do not excite the target, we find very large spin alignment of the excited ${}^{7}\mathrm{Li}$ projectiles longitudinal to the beam axis. This spin ali...

[Phys. Rev. Lett. 119, 232501] Published Fri Dec 08, 2017

]]>In the widely studied two-color laser scheme for terahertz (THz) radiation from a gas, the frequency ratio of the two lasers is usually fixed at ${\omega}_{2}/{\omega}_{1}=1:2$. We investigate THz generation with uncommon frequency ratios. Our experiments show, for the first time, efficient THz generation with new ratios...

[Phys. Rev. Lett. 119, 235001] Published Fri Dec 08, 2017

]]>A liquid microchannel—the line where three soap films meet—vibrates like a string whose diameter shrinks as the shaking force increases.

[Phys. Rev. Lett. 119, 238001] Published Fri Dec 08, 2017

]]>A Bose-Einstein condensate can act as a stable trap for a gas of fermions.

[Phys. Rev. Lett. 119, 233401] Published Thu Dec 07, 2017

]]>We present a method to certify the presence of Bell correlations in experimentally observed statistics, and to obtain new Bell inequalities. Our approach is based on relaxing the conditions defining the set of correlations obeying a local hidden variable model, yielding a convergent hierarchy of sem...

[Phys. Rev. Lett. 119, 230402] Published Wed Dec 06, 2017

]]>An exotic phase, the bond order wave, characterized by the spontaneous dimerization of the hopping, has been predicted to exist sandwiched between the band and Mott insulators in systems described by the ionic Hubbard model. Despite growing theoretical evidence, this phase still evades experimental ...

[Phys. Rev. Lett. 119, 230403] Published Wed Dec 06, 2017

]]>Systems which can spontaneously reveal periodic evolution are dubbed *time crystals*. This is in analogy with space crystals that display periodic behavior in configuration space. While space crystals are modeled with the help of space periodic potentials, crystalline phenomena in time can be modeled ...

[Phys. Rev. Lett. 119, 230404] Published Wed Dec 06, 2017

]]>New calculations show that the accretion flows that form after a neutron star collision can eject large amounts of matter rich in gold and other heavy elements.

[Phys. Rev. Lett. 119, 231102] Published Wed Dec 06, 2017

]]>Stochastic resonance is a general phenomenon usually observed in one-dimensional, amplitude modulated, bistable systems. We show experimentally the emergence of phase stochastic resonance in the bidimensional response of a forced nanoelectromechanical membrane by evidencing the enhancement of a weak...

[Phys. Rev. Lett. 119, 234101] Published Wed Dec 06, 2017

]]>We present results from consistent dynamo simulations, where the electrically conducting and incompressible flow inside a cylinder vessel is forced by moving impellers numerically implemented by a penalization method. The numerical scheme models jumps of magnetic permeability for the solid impellers...

[Phys. Rev. Lett. 119, 234501] Published Wed Dec 06, 2017

]]>Recently, it was shown that molecules rotating in superfluid helium can be described in terms of the angulon quasiparticles [Phys. Rev. Lett. **118**, 095301 (2017)]. Here, we demonstrate that in the experimentally realized regime the angulon can be seen as a point charge on a two-sphere interacting wit...

[Phys. Rev. Lett. 119, 235301] Published Wed Dec 06, 2017

]]>We present a method for computing the full probability distribution function of quadratic observables such as particle number or magnetization for the Fermi-Hubbard model within the framework of determinantal quantum Monte Carlo calculations. Especially in cold atom experiments with single-site reso...

[Phys. Rev. Lett. 119, 236401] Published Wed Dec 06, 2017

]]>The insulating honeycomb magnet $\alpha \text{\u2212}{\mathrm{RuCl}}_{3}$ exhibits fractionalized excitations that signal its proximity to a Kitaev quantum spin liquid state; however, at $T=0$, fragile long-range magnetic order arises from non-Kitaev terms in the Hamiltonian. Spin vacancies in the form of ${\mathrm{Ir}}^{3+}$ substituted for Ru are f...

[Phys. Rev. Lett. 119, 237203] Published Wed Dec 06, 2017

]]>We experimentally study magnetic resonances in the helical and conical magnetic phases of the chiral magnetic insulator ${\mathrm{Cu}}_{2}{\mathrm{OSeO}}_{3}$ at the temperature $T=5\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{K}$. Using a broadband microwave spectroscopy technique based on vector network analysis, we identify three distinct sets of helimagnon resonances in...

[Phys. Rev. Lett. 119, 237204] Published Wed Dec 06, 2017

]]>Using x-ray photon correlation spectroscopy, we examined the slow nanoscale motion of silica nanoparticles individually dispersed in an entangled poly (ethylene oxide) melt at particle volume fractions up to 42%. The nanoparticles, therefore, serve as both fillers for the resulting attractive polyme...

[Phys. Rev. Lett. 119, 237801] Published Wed Dec 06, 2017

]]>Resource theories of coherence are generalized to quantify the superposition of a finite number of linearly independent states.

[Phys. Rev. Lett. 119, 230401] Published Tue Dec 05, 2017

]]>Recently observed quantum emitters in hexagonal boron nitride (hBN) membranes have a potential for achieving high accessibility and controllability thanks to the lower spatial dimension. Moreover, these objects naturally have a high sensitivity to vibrations of the hosting membrane due to its low ma...

[Phys. Rev. Lett. 119, 233602] Published Tue Dec 05, 2017

]]>Metrological atomic force microscopy measurements are performed on the silica glass interfaces of photonic band-gap fibers and hollow capillaries. The freezing of attenuated out-of-equilibrium capillary waves during the drawing process is shown to result in a reduced surface roughness. The roughness...

[Phys. Rev. Lett. 119, 235501] Published Tue Dec 05, 2017

]]>Dynamical mean-field theory (DMFT) studies frequently observe a fine structure in the local spectral function of the SU(2) Fermi-Hubbard model at half filling: In the metallic phase close to the Mott transition, subpeaks emerge at the inner edges of the Hubbard bands. Here we demonstrate that these ...

[Phys. Rev. Lett. 119, 236402] Published Tue Dec 05, 2017

]]>For the endohedral fullerene molecule ${\mathrm{HoLu}}_{2}\mathrm{N}@{\mathrm{C}}_{80}$, it is shown that the endohedral ${\mathrm{HoLu}}_{2}\mathrm{N}$ unit may be oriented in a magnetic field. The Ho magnetic moment is fixed in the strong ligand field and aligns along the holmium-nitrogen axis. The torque of a magnetic field on the Ho magnetic moment leads to ...

[Phys. Rev. Lett. 119, 237202] Published Tue Dec 05, 2017

]]>Kinetic Monte Carlo methods such as the Gillespie algorithm model chemical reactions as random walks in particle number space. The interreaction times are exponentially distributed under the assumption that the system is well mixed. We introduce an arbitrary interreaction time distribution, which ma...

[Phys. Rev. Lett. 119, 230601] Published Mon Dec 04, 2017

]]>The MICROSCOPE satellite mission has tested the equivalence principle with unprecedented precision, showing no deviations from the predictions of general relativity.

[Phys. Rev. Lett. 119, 231101] Published Mon Dec 04, 2017

]]>We consider a closed region $R$ of 3D quantum space described via SU(2) spin networks. Using the concentration of measure phenomenon we prove that, whenever the ratio between the boundary $\partial R$ and the bulk edges of the graph overcomes a finite threshold, the state of the boundary is always thermal, with...

[Phys. Rev. Lett. 119, 231301] Published Mon Dec 04, 2017

]]>The first observation of the decay of a ${B}^{0}$ meson to a purely baryonic final state, ${B}^{0}\to p\overline{p}$, is reported. The proton-proton collision data sample used was collected with the LHCb experiment at center-of-mass energies of 7 and 8 TeV and corresponds to an integrated luminosity of $3.0\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{fb}}^{-1}$. The branchin...

[Phys. Rev. Lett. 119, 232001] Published Mon Dec 04, 2017

]]>We demonstrate the emergence of universal Efimov physics for interacting photons in cold gases of Rydberg atoms. We consider the behavior of three photons injected into the gas in their propagating frame, where a paraxial approximation allows us to consider them as massive particles. In contrast to ...

[Phys. Rev. Lett. 119, 233601] Published Mon Dec 04, 2017

]]>Quantum manipulation is challenging in localized-surface plasmon resonances (LSPRs) due to strong dissipations. To enhance quantum coherence, here we propose to engineer the electromagnetic environment of LSPRs by placing metallic nanoparticles (MNPs) in optical microcavities. An analytical quantum ...

[Phys. Rev. Lett. 119, 233901] Published Mon Dec 04, 2017

]]>Synchrotron x-ray diffraction measurements of nitrogen are performed up to 120 GPa to determine the melting curve and the structural changes of the solid and liquid phases along it. The melting temperature exhibits a monotonic increase up to the triple point where the epsilon molecular solid, the cu...

[Phys. Rev. Lett. 119, 235701] Published Mon Dec 04, 2017

]]>Experiments on a copper-based high-temperature superconductor uncover the existence of vortex states—a hallmark of conventional superconductivity.

[Phys. Rev. Lett. 119, 237001] Published Mon Dec 04, 2017

]]>We measure the gate voltage (${V}_{g}$) dependence of the superconducting properties and the spin-orbit interaction in the (111)-oriented ${\mathrm{LaAlO}}_{3}/\mathrm{SrTi}{\mathrm{O}}_{3}$ interface. Superconductivity is observed in a dome-shaped region in the carrier density-temperature phase diagram with the maxima of superconducting transi...

[Phys. Rev. Lett. 119, 237002] Published Mon Dec 04, 2017

]]>The formation of the triangular Skyrmion lattice is found in a tetragonal polar magnet ${\mathrm{VOSe}}_{2}{\mathrm{O}}_{5}$. By magnetization and small-angle neutron scattering measurements on the single crystals, we identify a cycloidal spin state at zero field and a Néel-type Skyrmion-lattice phase under a magnetic field alon...

[Phys. Rev. Lett. 119, 237201] Published Mon Dec 04, 2017

]]>Contextuality is an essential characteristic of quantum theory, and supplies the power for many quantum information processes. Previous tests of contextuality focus mainly on the probability distribution of measurement results. However, a test of contextuality can be formulated in terms of entropic ...

[Phys. Rev. Lett. 119, 220403] Published Fri Dec 01, 2017

]]>We investigate the statistical arrow of time for a quantum system being monitored by a sequence of measurements. For a continuous qubit measurement example, we demonstrate that time-reversed evolution is always physically possible, provided that the measurement record is also negated. Despite this r...

[Phys. Rev. Lett. 119, 220507] Published Fri Dec 01, 2017

]]>We analyze ground state (GS) factorization in general arrays of spins ${s}_{i}$ with $XXZ$ couplings immersed in nonuniform fields. It is shown that an exceptionally degenerate set of completely separable symmetry-breaking GSs can arise for a wide range of field configurations, at a quantum critical point wh...

[Phys. Rev. Lett. 119, 220605] Published Fri Dec 01, 2017

]]>A search for a signal consistent with the type-III seesaw mechanism in events with three or more electrons or muons is presented. The data sample consists of proton-proton collisions at $\sqrt{s}=13\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{TeV}$ collected by the CMS experiment at the LHC in 2016 and corresponds to an integrated luminosity of $35.9\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{...}}^{}$

[Phys. Rev. Lett. 119, 221802] Published Fri Dec 01, 2017

]]>Statistical reaction theories such as the Hauser-Feshbach theory assume that branching ratios follow Bohr’s compound nucleus hypothesis by factorizing into independent probabilities for different channels. Corrections to the factorization hypothesis are known in both nuclear theory and quantum trans...

[Phys. Rev. Lett. 119, 222504] Published Fri Dec 01, 2017

]]>Nuclear clustering describes the appearance of structures resembling smaller nuclei such as alpha particles (${}^{4}\text{He}$ nuclei) within the interior of a larger nucleus. In this Letter, we present lattice Monte Carlo calculations based on chiral effective field theory for the ground states of helium, beryll...

[Phys. Rev. Lett. 119, 222505] Published Fri Dec 01, 2017

]]>We demonstrate a continuously loaded ${}^{88}\mathrm{Sr}$ magneto-optical trap (MOT) with a steady-state phase-space density of $1.3(2)\times {10}^{-3}$. This is 2 orders of magnitude higher than reported in previous steady-state MOTs. Our approach is to flow atoms through a series of spatially separated laser cooling stages be...

[Phys. Rev. Lett. 119, 223202] Published Fri Dec 01, 2017

]]>$\alpha \text{\u2212}{\mathrm{RuCl}}_{3}$ is a leading candidate material for the observation of physics related to the Kitaev quantum spin liquid (QSL). By combined susceptibility, specific-heat, and nuclear-magnetic-resonance measurements, we demonstrate that $\alpha \text{\u2212}{\mathrm{RuCl}}_{3}$ undergoes a quantum phase transition to a QSL in a magnetic fiel...

[Phys. Rev. Lett. 119, 227208] Published Fri Dec 01, 2017

]]>The symmetric splitting of two spin-wave branches in an antiferromagnetic resonance (AFR) experiment has been an essential measurement of antiferromagnets for over half a century. In this work, circularly polarized time-domain THz spectroscopy experiments performed on the low symmetry multiferroic h...

[Phys. Rev. Lett. 119, 227601] Published Fri Dec 01, 2017

]]>Protein adsorption at the solid-liquid interface is an important phenomenon that often can be observed as a first step in biological processes. Despite its inherent importance, still relatively little is known about the underlying microscopic mechanisms. Here, using multivalent ions, we demonstrate ...

[Phys. Rev. Lett. 119, 228001] Published Fri Dec 01, 2017

]]>A jumble of thousands of cubic dice, agitated by an oscillating rotation, can rapidly become completely ordered, a result that is hard to produce with more conventional shaking.

[Phys. Rev. Lett. 119, 228002] Published Fri Dec 01, 2017

]]>An important contribution to the understanding of quantum key distribution has been the discovery of entangled states from which secret bits, but no maximally entangled states, can be extracted [Horodecki *et al.*, Phys. Rev. Lett. **94**, 200501 (2005)]. The construction of those states was based on an i...

[Phys. Rev. Lett. 119, 220506] Published Thu Nov 30, 2017

]]>The conventional theory of hydrodynamics describes the evolution in time of chaotic many-particle systems from local to global equilibrium. In a quantum integrable system, local equilibrium is characterized by a local generalized Gibbs ensemble or equivalently a local distribution of pseudomomenta. ...

[Phys. Rev. Lett. 119, 220604] Published Thu Nov 30, 2017

]]>Observations of black hole mergers in the very distant Universe could indicate whether all black holes form from stars.

[Phys. Rev. Lett. 119, 221104] Published Thu Nov 30, 2017

]]>In this Letter we present a theorem on the dynamics of the generalized Hubbard models. This theorem shows that the symmetry of the single-particle Hamiltonian can protect a kind of dynamical symmetry driven by the interactions. Here the dynamical symmetry refers to the phenomenon that time evolution...

[Phys. Rev. Lett. 119, 225302] Published Thu Nov 30, 2017

]]>A method is proposed for measuring the classical Hall viscosity of a two-dimensional electron gas under a magnetic field, via signatures of hydrodynamic transport.

[Phys. Rev. Lett. 119, 226602] Published Thu Nov 30, 2017

]]>Topological phases derived from point degeneracies in photonic band structures show intriguing and unique behavior. Previously identified band degeneracies are based on accidental degeneracies and subject to engineering on a case-by-case basis. Here we show that deterministic pseudo Weyl points with...

[Phys. Rev. Lett. 119, 227401] Published Thu Nov 30, 2017

]]>Experiments show that a semiconducting quantum dot containing nearly 100 electrons can operate as an effective spin 1/2 qubit.

[Phys. Rev. Lett. 119, 227701] Published Thu Nov 30, 2017

]]>A communication game consists of distributed parties attempting to jointly complete a task with restricted communication. Such games are useful tools for studying limitations of physical theories. A theory exhibits preparation contextuality whenever its predictions cannot be explained by a preparati...

[Phys. Rev. Lett. 119, 220402] Published Wed Nov 29, 2017

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