New models show that neutron stars—and not dark matter—could be responsible for an excess of gamma rays from the Milky Way’s center.

[Phys. Rev. Lett. 116, 051102] Published Thu Feb 04, 2016

]]>New models show that neutron stars—and not dark matter—could be responsible for an excess of gamma rays from the Milky Way’s center.

[Phys. Rev. Lett. 116, 051103] Published Thu Feb 04, 2016

]]>The statistical properties of interacting strongly chaotic systems are investigated for varying interaction strength. In order to model tunable entangling interactions between such systems, we introduce a new class of random matrix transition ensembles. The nearest-neighbor-spacing distribution show…

[Phys. Rev. Lett. 116, 054101] Published Thu Feb 04, 2016

]]>Observation of high-temperature superconductivity in compressed sulfur hydrides has generated an irresistible wave of searches for new hydrogen-containing superconductors. We herein report the prediction of high-${T}_{c}$ superconductivity in tellurium hydrides stabilized at megabar pressures identified by…

[Phys. Rev. Lett. 116, 057002] Published Thu Feb 04, 2016

]]>Exciton diffusion in organic materials provides the operational basis for functioning of such devices as organic solar cells and light-emitting diodes. Here we track the exciton diffusion process in organic semiconductors in real time with a novel technique based on femtosecond photoinduced absorpti…

[Phys. Rev. Lett. 116, 057402] Published Thu Feb 04, 2016

]]>The influence of size differences, shape, mass, and persistent motion on phase separation in binary mixtures has been intensively studied. Here we focus on the exclusive role of diffusivity differences in binary mixtures of equal-sized particles. We find an effective attraction between the less diff…

[Phys. Rev. Lett. 116, 058301] Published Thu Feb 04, 2016

]]>Evidence that the four-neutron system known as the tetraneutron exists as a resonance has been uncovered in an experiment at the RIKEN Radioactive Ion Beam Factory.

[Phys. Rev. Lett. 116, 052501] Published Wed Feb 03, 2016

]]>Investigating a theoretical model of the optical-field-induced current in dielectrics driven by strong few-cycle laser pulses, we propose an asymmetric conducting of the current by forming a heterojunction made of two distinct dielectrics with a low hole mass (${m}_{h}^{*}\ll {m}_{e}^{*}$) and low electron mass (${m}_{e}^{*}\ll {m}_{h}^{*}$…

[Phys. Rev. Lett. 116, 057401] Published Wed Feb 03, 2016

]]>[Phys. Rev. Lett. 116, 059401] Published Wed Feb 03, 2016

]]>[Phys. Rev. Lett. 116, 059402] Published Wed Feb 03, 2016

]]>Analyzing the noise in the momentum profiles of single realizations of one-dimensional Bose gases, we present the experimental measurement of the full momentum-space density correlations $\u27e8\delta {n}_{p}\delta {n}_{{p}^{\prime}}\u27e9$, which are related to the two-body momentum correlation function. Our data span the weakly interacting …

[Phys. Rev. Lett. 116, 050402] Published Tue Feb 02, 2016

]]>Probing electronic wave functions of polyatomic molecules is one of the major challenges in high-harmonic spectroscopy. The extremely nonlinear nature of the laser-molecule interaction couples the multiple degrees of freedom of the probed system. We combine two-dimensional control of the electron tr…

[Phys. Rev. Lett. 116, 053002] Published Tue Feb 02, 2016

]]>We revisit the $m{\alpha}^{6}(m/M)$ order corrections to the hyperfine splitting in the ${\mathrm{H}}_{2}^{+}$ ion and find a hitherto unrecognized second-order relativistic contribution associated with the vibrational motion of the nuclei. Inclusion of this correction term produces theoretical predictions which are in excellent …

[Phys. Rev. Lett. 116, 053003] Published Tue Feb 02, 2016

]]>We propose an approach to quantum phase estimation that can attain precision near the Heisenberg limit without requiring single-particle-resolved state detection. We show that the “one-axis twisting” interaction, well known for generating spin squeezing in atomic ensembles, can also amplify the outp…

[Phys. Rev. Lett. 116, 053601] Published Tue Feb 02, 2016

]]>When an impurity interacts with a bath of phonons it forms a polaron. For increasing interaction strengths the mass of the polaron increases and it can become self-trapped. For impurity atoms inside an atomic Bose-Einstein condensate (BEC) the nature of this transition is not understood. While Feynm…

[Phys. Rev. Lett. 116, 053602] Published Tue Feb 02, 2016

]]>A solid wooden cube fragments into pieces as we sequentially drill holes through it randomly. This seemingly straightforward observation encompasses deep and nontrivial geometrical and probabilistic behavior that is discussed here. Combining numerical simulations and rigorous results, we find off-cr…

[Phys. Rev. Lett. 116, 055701] Published Tue Feb 02, 2016

]]>We study a three-dimensional plaquette spin model whose low temperature dynamics is glassy, due to localized defects and effective kinetic constraints. The thermodynamics of this system is smooth at all temperatures. We show that coupling it to a second system with a fixed (quenched) configuration l…

[Phys. Rev. Lett. 116, 055702] Published Tue Feb 02, 2016

]]>A novel type of action spectrum representing multiple overtone excitations of the $v(M\text{\u2212}\mathrm{C})$ mode was observed for lateral hopping of a CO molecule on Ag(110) induced by inelastically tunneled electrons from the tip of a scanning tunneling microscope. The yield of CO hopping shows sharp increases at $261\dots $

[Phys. Rev. Lett. 116, 056101] Published Tue Feb 02, 2016

]]>Surface tension is a macroscopic manifestation of the cohesion of matter, and its value ${\sigma}_{\infty}$ is readily measured for a flat liquid-vapor interface. For interfaces with a small radius of curvature $R$, the surface tension might differ from ${\sigma}_{\infty}$. The Tolman equation, $\sigma (R)={\sigma}_{\infty}/(1+2\delta /R)$, with $\delta $ a constant leng…

[Phys. Rev. Lett. 116, 056102] Published Tue Feb 02, 2016

]]>We present a generalized hydrogen model for the binding energies (${E}_{B}$) and radii of excitons in two-dimensional (2D) materials that sheds light on the fundamental differences between excitons in two and three dimensions. In contrast to the well-known hydrogen model of three-dimensional (3D) excitons,…

[Phys. Rev. Lett. 116, 056401] Published Tue Feb 02, 2016

]]>In certain disordered superconductors, upon increasing the magnetic field, superconductivity terminates with a direct transition into an insulating phase. This phase is comprised of localized Cooper pairs and is termed a Cooper-pair insulator. The current-voltage characteristics measured in this ins…

[Phys. Rev. Lett. 116, 057001] Published Tue Feb 02, 2016

]]>[Phys. Rev. Lett. 116, 059901] Published Tue Feb 02, 2016

]]>Information derived from microscopic measurements of thermal states made using a few photons is used to extract macroscopic work.

[Phys. Rev. Lett. 116, 050401] Published Mon Feb 01, 2016

]]>The mathematical framework used to describe gravitational waves is extended to incorporate the effect of a positive cosmological constant for the first time.

[Phys. Rev. Lett. 116, 051101] Published Mon Feb 01, 2016

]]>Quantum matter falling into a semiclassical black hole leaves an imprint on future Hawking radiation. The resulting black hole entropy will be much smaller than the area of the event horizon.

[Phys. Rev. Lett. 116, 051301] Published Mon Feb 01, 2016

]]>We present spectroscopy of a single Rydberg atom excited within a Bose-Einstein condensate. We not only observe the density shift as discovered by Amaldi and Segrè in 1934, but a line shape that changes with the principal quantum number $n$. The line broadening depends precisely on the interaction pot…

[Phys. Rev. Lett. 116, 053001] Published Mon Feb 01, 2016

]]>Geometrical engineering of nickelate-based heterostructures can result in artificial graphene-like Mott crystals with antiferromagnetic correlations, structures that are not seen in bulk nickelates.

[Phys. Rev. Lett. 116, 056801] Published Mon Feb 01, 2016

]]>A spin-torque-driven ferromagnetic resonance in magnetic insulators is spatially mapped showing a localized spin-wave structure.

[Phys. Rev. Lett. 116, 057601] Published Mon Feb 01, 2016

]]>The Jahn-Teller distortion, by its very nature, is often at the heart of the various electronic properties displayed by perovskites and related materials. Despite the Jahn-Teller mode being nonpolar, we devise and demonstrate, in the present Letter, an electric field control of Jahn-Teller distortio…

[Phys. Rev. Lett. 116, 057602] Published Mon Feb 01, 2016

]]>Biochemical networks are often poorly characterized, but researchers can still derive limits on the level of the random variations or noise in different network components.

[Phys. Rev. Lett. 116, 058101] Published Mon Feb 01, 2016

]]>Weak measurements have thus far been considered instrumental in the so-called direct measurement of the quantum wave function [J. S. Lundeen, Nature (London) **474**, 188 (2011).]. Here we show that a direct measurement of the wave function can be obtained by using measurements of arbitrary strength. In…

[Phys. Rev. Lett. 116, 040502] Published Fri Jan 29, 2016

]]>Quantum vacuum fluctuations impose strict limits on precision displacement measurements, those of interferometric gravitational-wave detectors among them. Introducing squeezed states into an interferometer’s readout port can improve the sensitivity of the instrument, leading to richer astrophysical …

[Phys. Rev. Lett. 116, 041102] Published Fri Jan 29, 2016

]]>We investigate quantum radiation reaction in laser-electron interactions across different energy and intensity regimes. Using a fully quantum approach which also accounts exactly for the effect of the strong laser pulse on the electron motion, we identify in particular a regime in which radiation re…

[Phys. Rev. Lett. 116, 044801] Published Fri Jan 29, 2016

]]>Artificial magnetic fields (AMFs) created for ultracold systems depend sensitively on the internal structure of the atoms. In a mixture, each component experiences a different AMF depending on its internal state. This enables the study of Bardeen-Cooper-Schrieffer pairing of fermions with unequal ef…

[Phys. Rev. Lett. 116, 045305] Published Fri Jan 29, 2016

]]>We consider a zigzag chain of coupled micropillar cavities, taking into account the polarization of polariton states. We show that the TE-TM splitting of photonic cavity modes yields topologically protected polariton edge states. During the strongly nonadiabatic process of polariton condensation, th…

[Phys. Rev. Lett. 116, 046402] Published Fri Jan 29, 2016

]]>Recent quantum oscillation experiments on ${\mathrm{SmB}}_{6}$ pose a paradox, for while the angular dependence of the oscillation frequencies suggest a 3D bulk Fermi surface, ${\mathrm{SmB}}_{6}$ remains robustly insulating to very high magnetic fields. Moreover, a sudden low temperature upturn in the amplitude of the oscillation…

[Phys. Rev. Lett. 116, 046403] Published Fri Jan 29, 2016

]]>The canonical understanding of quantum oscillation in metals is challenged by the observation of the de Haas–van Alphen effect in an insulator, ${\mathrm{SmB}}_{6}$ [Tan *et al*, Science **349**, 287 (2015)]. Based on a two-band model with inverted band structure, we show that the periodically narrowing hybridization gap…

[Phys. Rev. Lett. 116, 046404] Published Fri Jan 29, 2016

]]>Monolayers of group 6 transition metal dichalcogenides are promising candidates for future spin-, valley-, and charge-based applications. Quantum transport in these materials reflects a complex interplay between real spin and pseudospin (valley) relaxation processes, which leads to either positive o…

[Phys. Rev. Lett. 116, 046803] Published Fri Jan 29, 2016

]]>A combination of experiments and numerical modeling was used to study the spatial evolution of the ferromagnetic phase transition in a thin film engineered to have a smooth gradient in exchange strength. Mean-field simulations predict, and experiments confirm, that a 100 nm ${\mathrm{Ni}}_{x}{\mathrm{Cu}}_{1-x}$ alloy film with …

[Phys. Rev. Lett. 116, 047203] Published Fri Jan 29, 2016

]]>We study the parametric excitation of high orders of magnetization precession in ultrathin films having perpendicular magnetic anisotropy. We observe that for a given driving field amplitude the harmonic generation can be increased by lowering the barrier with the application of an in-plane magnetic…

[Phys. Rev. Lett. 116, 047204] Published Fri Jan 29, 2016

]]>Steel spheres placed on a square grid, connected by springs, and individually driven by motors are used to investigate the vibrational modes of a nonequilibrium system.

[Phys. Rev. Lett. 116, 048302] Published Fri Jan 29, 2016

]]>[Phys. Rev. Lett. 116, 049901] Published Fri Jan 29, 2016

]]>[Phys. Rev. Lett. 116, 049902] Published Fri Jan 29, 2016

]]>[Phys. Rev. Lett. 116, 049903] Published Fri Jan 29, 2016

]]>Consider the partition function of a classical system in two spatial dimensions, or the Euclidean path integral of a quantum system in two space-time dimensions, both on a lattice. We show that the tensor network renormalization algorithm [G. Evenbly and G. Vidal Phys. Rev. Lett. **115**, 180405 (2015)]…

[Phys. Rev. Lett. 116, 040401] Published Thu Jan 28, 2016

]]>A new model has allowed researchers to test a theory for why the centers of dark matter halos are less dense than expected.

[Phys. Rev. Lett. 116, 041302] Published Thu Jan 28, 2016

]]>An optimal parametric feedback excitation principle is sought, found, and investigated. The principle is shown to provide an adaptive resonance condition that enables unprecedentedly robust movement generation in a large class of oscillatory dynamical systems. Experimental demonstration of the theor…

[Phys. Rev. Lett. 116, 044102] Published Thu Jan 28, 2016

]]>We present a measurement of the azimuthal asymmetries of two charged pions in the inclusive process ${e}^{+}{e}^{-}\to \pi \pi X$, based on a data set of $62\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{pb}}^{-1}$ at the center-of-mass energy of 3.65 GeV collected with the BESIII detector. These asymmetries can be attributed to the Collins fragmentation function. We obs…

[Phys. Rev. Lett. 116, 042001] Published Wed Jan 27, 2016

]]>Ab initio simulations of electronic excitations produced when a semiconductor experiences a large perturbation show a new regime in electron-ion energy exchange whereby a defect state carries electrons across the band gap.

[Phys. Rev. Lett. 116, 043201] Published Wed Jan 27, 2016

]]>We reveal the existence of high-density Feshbach resonances in the collision between the ground and metastable states of ${}^{171}\mathrm{Yb}$ and coherently produce the associated Feshbach molecules by photoassociation. The extremely small transition rate is overcome by the enhanced Franck-Condon factor of the wea…

[Phys. Rev. Lett. 116, 043202] Published Wed Jan 27, 2016

]]>We consider the electromagnetic field generated by a coherent conductor in which electron transport is described quantum mechanically. We obtain an input-output relation linking the quantum current in the conductor to the measured electromagnetic field. This allows us to compute the outcome of measu…

[Phys. Rev. Lett. 116, 043602] Published Wed Jan 27, 2016

]]>We demonstrate the existence of stable three-dimensional dissipative localized structures in the output of a laser coupled to a distant saturable absorber. These phase invariant cavity light bullets are individually addressable and can be envisioned for three-dimensional optical information storage.…

[Phys. Rev. Lett. 116, 043901] Published Wed Jan 27, 2016

]]>We characterize the nonlinear stage of modulational instability (MI) by studying the longtime asymptotics of the focusing nonlinear Schrödinger (NLS) equation on the infinite line with initial conditions tending to constant values at infinity. Asymptotically in time, the spatial domain divides into …

[Phys. Rev. Lett. 116, 043902] Published Wed Jan 27, 2016

]]>We present a spatiotemporal mechanism for producing 2D optical rogue waves in the presence of a turbulent state with creation, interaction, and annihilation of optical vortices. Spatially periodic structures with bound phase lose stability to phase unbound turbulent states in complex Ginzburg-Landau…

[Phys. Rev. Lett. 116, 043903] Published Wed Jan 27, 2016

]]>Two separate groups have extracted the thermodynamic equation of state for a two-dimensional gas of fermionic atoms, revealing its peculiar quantum features.

[Phys. Rev. Lett. 116, 045302] Published Wed Jan 27, 2016

]]>Two separate groups have extracted the thermodynamic equation of state for a two-dimensional gas of fermionic atoms, revealing its peculiar quantum features.

[Phys. Rev. Lett. 116, 045303] Published Wed Jan 27, 2016

]]>We follow the time evolution of a superfluid Fermi gas of resonantly interacting ${}^{6}\mathrm{Li}$ atoms after a phase imprint. Via tomographic imaging, we observe the formation of a planar dark soliton, its subsequent snaking, and its decay into a vortex ring, which, in turn, breaks to finally leave behind a sin…

[Phys. Rev. Lett. 116, 045304] Published Wed Jan 27, 2016

]]>We use high-resolution neutron Larmor diffraction and capacitative dilatometry to investigate spontaneous and forced magnetostriction in undoped, antiferromagnetic ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{6.0}$, the parent compound of a prominent family of high-temperature superconductors. Upon cooling below the Néel temperature ${T}_{N}=\mathrm{4\dots}$

[Phys. Rev. Lett. 116, 047001] Published Wed Jan 27, 2016

]]>Spin transfer in magnetic multilayers offers the possibility of ultrafast, low-power device operation. We report a study of spin pumping in spin valves, demonstrating that a strong anisotropy of spin pumping from the source layer can be induced by an angular dependence of the total Gilbert damping p…

[Phys. Rev. Lett. 116, 047201] Published Wed Jan 27, 2016

]]>Low-temperature neutron diffraction and NMR studies of field-induced phases in linarite are presented for magnetic fields $H\parallel b$ axis. A two-step spin-flop transition is observed, as well as a transition transforming a helical magnetic ground state into an unusual magnetic phase with sine-wave-modulate…

[Phys. Rev. Lett. 116, 047202] Published Wed Jan 27, 2016

]]>Underlying symmetries can be used to elucidate the structure and properties of the discrete version of the Wigner quasi-probability distribution function in phase space.

[Phys. Rev. Lett. 116, 040501] Published Tue Jan 26, 2016

]]>Yang-Yang (YY) and singular diameter critical anomalies arise in *exactly soluble compressible cell gas* (CCG) models that obey *complete scaling* with pressure mixing. Thus, on the critical isochore $\rho ={\rho}_{c}$, ${\tilde{C}}_{\mu}\u2254-T{d}^{2}\mu /d{T}^{2}$ diverges as $|t{|}^{-\alpha}$ when $t\propto T-{T}_{c}\to {0}^{-}$ while ${\rho}_{d}-{\rho}_{c}\sim |t{|}^{2\beta}$ where ${\rho}_{d}(T)=\frac{1}{2}[{\rho}_{\text{liq}}+{\rho}_{\text{gas}}]$. When t…

[Phys. Rev. Lett. 116, 040601] Published Tue Jan 26, 2016

]]>Gravitational collapse of a massless scalar field in spherically symmetric anti–de Sitter (AdS) spacetimes presents a new phenomenology with a series of critical points whose dynamics is discretely self-similar as in the asymptotically flat case. Each critical point is the limit of a branch of scala…

[Phys. Rev. Lett. 116, 041101] Published Tue Jan 26, 2016

]]>We report on measurements of the decays of $\overline{B}$ mesons into the semileptonic final states $\overline{B}\to {D}^{(*)}{\pi}^{+}{\pi}^{-}{\ell}^{-}\overline{\nu}$, where ${D}^{(*)}$ represents a $D$ or ${D}^{*}$ meson and ${\ell}^{-}$ is an electron or a muon. These measurements are based on $471\times {10}^{6}$ $B\overline{B}$ pairs recorded with the *BABAR* detector at the SLAC asymmetric $B$ factory PEP-II. …

[Phys. Rev. Lett. 116, 041801] Published Tue Jan 26, 2016

]]>Electron-positron angular correlations were measured for the isovector magnetic dipole 17.6 MeV (${J}^{\pi}={1}^{+}$, $T=1$) $\text{state}\to \text{ground}$ state (${J}^{\pi}={0}^{+}$, $T=0$) and the isoscalar magnetic dipole 18.15 MeV (${J}^{\pi}={1}^{+}$, $T=0$) $\text{state}\to \text{ground}$ state transitions in ${}^{8}\mathrm{Be}$. Significant enhancement relative to the internal pair creation …

[Phys. Rev. Lett. 116, 042501] Published Tue Jan 26, 2016

]]>We investigate the dissociation of ${{\mathrm{H}}_{2}}^{+}$ into a proton and a ${\mathrm{H}}^{0}$ after single ionization with photons of an energy close to the threshold. We find that the ${p}^{+}$ and the ${\mathrm{H}}^{0}$ do not emerge symmetrically in the case of the ${{\mathrm{H}}_{2}}^{+}$ dissociating along the $1s{\sigma}_{g}$ ground state. Instead, a preference for the ejection o…

[Phys. Rev. Lett. 116, 043001] Published Tue Jan 26, 2016

]]>We demonstrate Doppler cooling of trapped magnesium ions using a frequency comb at 280 nm obtained from a frequency tripled Ti:sapphire laser. A comb line cools on the $3{s}_{1/2}-3{p}_{3/2}$ transition, while the nearest blue-detuned comb line contributes negligible heating. We observe the cooling-heating tran…

[Phys. Rev. Lett. 116, 043002] Published Tue Jan 26, 2016

]]>A new device converts the frequency of a photon using the vibrations in a mechanical oscillator.

[Phys. Rev. Lett. 116, 043601] Published Tue Jan 26, 2016

]]>A dark state – a state that cannot emit or absorb photons – can be created by the hyperfine coupling of the electron spin of a single nitrogen-vacancy defect to a nearby ${}^{13}$C nuclear spin.

[Phys. Rev. Lett. 116, 043603] Published Tue Jan 26, 2016

]]>Phase-control techniques of chaos aim to extract periodic behaviors from chaotic systems by applying weak harmonic perturbations with a suitably chosen phase. However, little is known about the best strategy for selecting adequate perturbations to reach desired states. Here we use experimental measu…

[Phys. Rev. Lett. 116, 044101] Published Tue Jan 26, 2016

]]>In this work, the manipulation of an electrically charged droplet bouncing on a vertically vibrated bath is investigated. When a horizontal, uniform, and static electric field is applied to it, a motion is induced. The droplet is accelerated when the droplet is small. On the other hand, large drople…

[Phys. Rev. Lett. 116, 044501] Published Tue Jan 26, 2016

]]>A unique feature of ultracold atoms is the separation of length scales, ${r}_{0}\ll {k}_{F}^{-1}$, where ${k}_{F}$ and ${r}_{0}$ are the Fermi momentum characterizing the average particle distance and the range of interaction between atoms, respectively. For $s$-wave scattering, Shina Tan discovered that such diluteness leads to uni…

[Phys. Rev. Lett. 116, 045301] Published Tue Jan 26, 2016

]]>The global phase diagram of wetting in the two-dimensional Ising model is obtained through the exact calculation of the surface excess free energy. In addition to a surface field for inducing wetting, a surface-coupling enhancement is also included. The wetting transition (of second order) is critic…

[Phys. Rev. Lett. 116, 046101] Published Tue Jan 26, 2016

]]>We propose to realize and observe Chern Kondo insulators in an optical superlattice with laser-assisted $s$ and $p$ orbital hybridization and a synthetic gauge field, which can be engineered based on the recent cold atom experiments. Considering a double-well square optical lattice, the localized $s$ orbi…

[Phys. Rev. Lett. 116, 046401] Published Tue Jan 26, 2016

]]>Several recent experiments have reported an anomalous temperature dependence of the Coulomb drag effect in electron-hole bilayers. Motivated by these puzzling data, we study theoretically a low-density electron-hole bilayer, where electrons and holes avoid quantum degeneracy by forming excitons. We …

[Phys. Rev. Lett. 116, 046801] Published Tue Jan 26, 2016

]]>Near noise-free measurements of spin qubits in a GaAs quantum dot system are achieved by measuring the qubit dephasing time on a timescale faster than the noise decorrelation time.

[Phys. Rev. Lett. 116, 046802] Published Tue Jan 26, 2016

]]>Motile and driven particles confined in microfluidic channels exhibit interesting emergent behavior, from propagating density bands to density shock waves. A deeper understanding of the physical mechanisms responsible for these emergent structures is relevant to a number of physical and biomedical a…

[Phys. Rev. Lett. 116, 048101] Published Tue Jan 26, 2016

]]>The charge formation at interfaces involving electrolyte solutions is due to the chemical equilibrium between the surface reactive groups and the potential determining ions in the solution (i.e., charge regulation). In this Letter we report our findings that this equilibrium is strongly coupled to t…

[Phys. Rev. Lett. 116, 048301] Published Tue Jan 26, 2016

]]>The clumping of galaxies and galaxy clusters has a subtle dependence on their assembly history—a predicted effect that has now been detected.

[Phys. Rev. Lett. 116, 041301] Published Mon Jan 25, 2016

]]>A modern technique for computing scattering amplitudes—the key ingredients for predicting what particle physics experiments will observe—has now been extended to cover effective quantum field theories.

[Phys. Rev. Lett. 116, 041601] Published Mon Jan 25, 2016

]]>Having analytical instances of the eigenstate thermalization hypothesis (ETH) is of obvious interest, both for fundamental and applied reasons. This is generally a hard task, due to the belief that nonlinear interactions are basic ingredients of the thermalization mechanism. In this article we prove…

[Phys. Rev. Lett. 116, 030401] Published Fri Jan 22, 2016

]]>We experimentally study the dynamics of a degenerate one-dimensional Bose gas that is subject to a continuous outcoupling of atoms. Although standard evaporative cooling is rendered ineffective by the absence of thermalizing collisions in this system, we observe substantial cooling. This cooling pro…

[Phys. Rev. Lett. 116, 030402] Published Fri Jan 22, 2016

]]>Standard quantum state preparation methods work by preparing a required state locally and then distributing it to a distant location by a free-space propagation. We instead study procedures of preparing a target state at a remote location in the presence of an interacting background medium on which …

[Phys. Rev. Lett. 116, 030403] Published Fri Jan 22, 2016

]]>The fine-structure constant and the electron mass in string theory are determined by the values of scalar fields called moduli. If the dark matter takes on the form of such a light modulus, it oscillates with a frequency equal to its mass and an amplitude determined by the local dark-matter density.…

[Phys. Rev. Lett. 116, 031102] Published Fri Jan 22, 2016

]]>The overabundance of dark matter predicted by many otherwise well-motivated models could be remedied if the universe underwent a period of late-time inflation.

[Phys. Rev. Lett. 116, 031303] Published Fri Jan 22, 2016

]]>The production cross sections of the ${B}^{+}$, ${B}^{0}$, and ${B}_{s}^{0}$ mesons, and of their charge conjugates, are measured via exclusive hadronic decays in $p+\mathrm{Pb}$ collisions at the center-of-mass energy $\sqrt{{s}_{NN}}=5.02\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{TeV}$ with the CMS detector at the CERN LHC. The data set used for this analysis corresponds to an integrate…

[Phys. Rev. Lett. 116, 032301] Published Fri Jan 22, 2016

]]>Isomer shifts have been determined in ${}^{111\u2013129}\mathrm{Cd}$ by high-resolution laser spectroscopy at CERN-ISOLDE. The corresponding mean square charge-radii changes, from the $1/{2}^{+}$ and the $3/{2}^{+}$ ground states to the $11/{2}^{-}$ isomers, have been found to follow a distinct parabolic dependence as a function of the atom…

[Phys. Rev. Lett. 116, 032501] Published Fri Jan 22, 2016

]]>Positronium (Ps) is widely used as a probe for studying nanometric porosities in condensed matter. Accessible experimental measurements concern annihilation rates by pickoff processes and contact densities (the electron density at the positron position). Existing models for describing Ps properties …

[Phys. Rev. Lett. 116, 033401] Published Fri Jan 22, 2016

]]>In many quantum architectures the solid-state qubits, such as quantum dots or color centers, are interfaced via emitted photons. However, the frequency of photons emitted by solid-state systems exhibits slow uncontrollable fluctuations over time (spectral diffusion), creating a serious problem for i…

[Phys. Rev. Lett. 116, 033603] Published Fri Jan 22, 2016

]]>We examine the phase evolution of a Bose-Einstein condensate of photons generated in a dye microcavity by temporal interference with a phase reference. The photoexcitable dye molecules constitute a reservoir of variable size for the condensate particles, allowing for grand canonical statistics with …

[Phys. Rev. Lett. 116, 033604] Published Fri Jan 22, 2016

]]>We use advanced statistical tools of time-series analysis to characterize the dynamical complexity of the transition to optical wave turbulence in a fiber laser. Ordinal analysis and the horizontal visibility graph applied to the experimentally measured laser output intensity reveal the presence of …

[Phys. Rev. Lett. 116, 033902] Published Fri Jan 22, 2016

]]>We propose the use of optical lattice clocks operated with fermionic alkaline-earth atoms to study spin-orbit coupling (SOC) in interacting many-body systems. The SOC emerges naturally during the clock interrogation, when atoms are allowed to tunnel and accumulate a phase set by the ratio of the “ma…

[Phys. Rev. Lett. 116, 035301] Published Fri Jan 22, 2016

]]>We report the first application of critical cluster techniques to the Mott metal-insulator transition in vanadium dioxide. We show that the geometric universal properties of the metallic and insulating puddles observed by scanning near-field infrared microscopy are consistent with the system passing…

[Phys. Rev. Lett. 116, 036401] Published Fri Jan 22, 2016

]]>We report on a time-resolved ultrafast optical spectroscopy study of the topological insulator ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$. We unravel that a net spin polarization cannot only be generated using circularly polarized light via interband transitions between topological surface states (SSs), but also via transitions betwee…

[Phys. Rev. Lett. 116, 036601] Published Fri Jan 22, 2016

]]>We show that boundaries of 3D weak topological insulators can become gapped by strong interactions while preserving all symmetries, leading to Abelian surface topological order. The anomalous nature of weak topological insulator surfaces manifests itself in a nontrivial action of symmetries on the q…

[Phys. Rev. Lett. 116, 036803] Published Fri Jan 22, 2016

]]>We report high magnetic field measurements of magnetic torque, thermoelectric power, magnetization, and the de Haas–van Alphen effect in ${\mathrm{CeIrIn}}_{5}$ across 28 T, where a metamagnetic transition was suggested in previous studies. The thermoelectric power displays two maxima at 28 and 32 T. Above 28 T, a …

[Phys. Rev. Lett. 116, 037202] Published Fri Jan 22, 2016

]]>The quantum mechanical counterpart of the famous Stoner-Wohlfarth model—an easy-axis magnet in a tilted magnetic field—is studied theoretically and through simulations as a function of the spin size $S$ in a sweeping longitudinal field. Beyond the classical Stoner-Wohlfarth transition, the sweeping fi…

[Phys. Rev. Lett. 116, 037203] Published Fri Jan 22, 2016

]]>Minimizing decoherence due to coupling of a quantum system to its fluctuating environment is at the forefront of quantum information and photonics research. Nature sets the ultimate limit, however, given by the strength of the system’s coupling to the electromagnetic field. Here, we establish the ab…

[Phys. Rev. Lett. 116, 037402] Published Fri Jan 22, 2016

]]>We establish the Hamiltonian structure of the rate equations describing the formation of protein filaments. We then show that this formalism provides a unified view of the behavior of a range of biological self-assembling systems as diverse as actin, prions, and amyloidogenic polypeptides. We furthe…

[Phys. Rev. Lett. 116, 038101] Published Fri Jan 22, 2016

]]>We illuminate the nature of the three-dimensional random walks of microorganisms composed of individual organisms adhered together. Such *aggregate random walkers* are typified by choanoflagellates, eukaryotes that are the closest living relatives of animals. In the colony-forming species *Salpingoeca …*

[Phys. Rev. Lett. 116, 038102] Published Fri Jan 22, 2016

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