For macroscopic quantum systems, we study what is measured when equilibrium fluctuations of macrovariables are measured in an ideal way that mimics classical ideal measurements as closely as possible. We find that the symmetrized time correlation is always obtained for such measurements. As an impor…

[Phys. Rev. Lett. 117, 010402] Published Tue Jun 28, 2016

]]>The question whether a given quantum state is a ground or thermal state of a few-body Hamiltonian can be used to characterize the complexity of the state and is important for possible experimental implementations. We provide methods to characterize the states generated by two- and, more generally, $k$…

[Phys. Rev. Lett. 117, 010403] Published Tue Jun 28, 2016

]]>Quantum error correction and fault tolerance make it possible to perform quantum computations in the presence of imprecision and imperfections of realistic devices. An important question is to find the noise rate at which errors can be arbitrarily suppressed. By concatenating the 7-qubit Steane and …

[Phys. Rev. Lett. 117, 010501] Published Tue Jun 28, 2016

]]>Researchers propose a stochastic heat engine that runs without an external control system.

[Phys. Rev. Lett. 117, 010602] Published Tue Jun 28, 2016

]]>Spin-changing collisions between atoms in a Bose-Einstein condensate are used experimentally to implement a non-linear interferometer for quantum-enhanced phase measurements with sensitivity better than the standard quantum limit.

[Phys. Rev. Lett. 117, 013001] Published Tue Jun 28, 2016

]]>Tightly focused light beams can exhibit complex and versatile structured electric field distributions. The local field may spin around any axis including a transverse axis perpendicular to the beams’ propagation direction. At certain focal positions, the corresponding local polarization ellipse can …

[Phys. Rev. Lett. 117, 013601] Published Tue Jun 28, 2016

]]>${\mathrm{CaFe}}_{2}{\mathrm{O}}_{4}$ is a $S=\frac{5}{2}$ anisotropic antiferromagnet based upon zig-zag chains having two competing magnetic structures, denoted as the $A$ ($\uparrow \uparrow \downarrow \downarrow $) and $B$ ($\uparrow \downarrow \uparrow \downarrow $) phases, which differ by the $c$-axis stacking of ferromagnetic stripes. We apply neutron scattering to demonstrate that the competing $A$ and $B$ phase ord…

[Phys. Rev. Lett. 117, 017201] Published Tue Jun 28, 2016

]]>We report on the measurement of the time required for a wave packet to tunnel through the potential barriers of an optical lattice. The experiment is carried out by loading adiabatically a Bose-Einstein condensate into a 1D optical lattice. A sudden displacement of the lattice by a few tens of nanom…

[Phys. Rev. Lett. 117, 010401] Published Mon Jun 27, 2016

]]>We report the first observation of the decay ${\mathrm{\Lambda}}_{c}^{+}\to p{K}^{+}{\pi}^{-}$ using a $980\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{fb}}^{-1}$ data sample collected by the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{-}$ collider. This is the first observation of a doubly Cabibbo-suppressed decay of a charmed baryon. We measure the branching ratio of this decay with …

[Phys. Rev. Lett. 117, 011801] Published Mon Jun 27, 2016

]]>We show that the nonlinear stage of modulational instability induced by parametric driving in the *defocusing* nonlinear Schrödinger equation can be accurately described by combining mode truncation and averaging methods, valid in the strong driving regime. The resulting integrable oscillator reveals …

[Phys. Rev. Lett. 117, 013901] Published Mon Jun 27, 2016

]]>The thermal conductivity $\kappa $ of the heavy-fermion metal ${\mathrm{CeCoIn}}_{5}$ was measured in the normal and superconducting states as a function of temperature $T$ and magnetic field $H$, for a current and field parallel to the [100] direction. Inside the superconducting state, when the field is lower than the upper c…

[Phys. Rev. Lett. 117, 016601] Published Mon Jun 27, 2016

]]>We present the first *in situ* $W$-band (94-GHz) electron paramagnetic resonance (EPR) study of a trapped electron center in thin MgO(001) films. The improved resolution of the high-field EPR experiments proves that the signal originate from a well-defined species present in the bulk of the films, whose…

[Phys. Rev. Lett. 117, 016801] Published Mon Jun 27, 2016

]]>Theoretical work reveals a surprising relationship between the physics of fermionic vortices and quantum electrodynamics.

[Phys. Rev. Lett. 117, 016802] Published Mon Jun 27, 2016

]]>We propose a stochastic model for gene transcription coupled to DNA supercoiling, where we incorporate the experimental observation that polymerases create supercoiling as they unwind the DNA helix and that these enzymes bind more favorably to regions where the genome is unwound. Within this model, …

[Phys. Rev. Lett. 117, 018101] Published Mon Jun 27, 2016

]]>A unifying principle explaining the numerical bounds of quantum correlations remains elusive, despite the efforts devoted to identifying it. Here, we show that these bounds are indeed not exclusive to quantum theory: for any abstract correlation scenario with compatible measurements, models based on…

[Phys. Rev. Lett. 116, 250404] Published Fri Jun 24, 2016

]]>Cosmologists have begun using fully relativistic models to understand the effects of inhomogeneous matter distribution on the evolution of the Universe.

[Phys. Rev. Lett. 116, 251301] Published Fri Jun 24, 2016

]]>Cosmologists have begun using fully relativistic models to understand the effects of inhomogeneous matter distribution on the evolution of the Universe.

[Phys. Rev. Lett. 116, 251302] Published Fri Jun 24, 2016

]]>Spinning a few spheres among a large collection of them can lead to a predictable state where each sphere rotates in synch with the others.

[Phys. Rev. Lett. 116, 254301] Published Fri Jun 24, 2016

]]>A new class of inertial fusion capsules is presented that combines multishell targets with laser direct drive at low intensity ($2.8\times {10}^{14}\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{W}/{\mathrm{cm}}^{2}$) to achieve robust ignition. The targets consist of three concentric, heavy, metal shells, enclosing a volume of tens of $\mu \mathrm{g}$ of liquid deuterium-tritium fuel…

[Phys. Rev. Lett. 116, 255003] Published Fri Jun 24, 2016

]]>The low energy spin excitation spectrum of the breathing pyrochlore ${\mathrm{Ba}}_{3}{\mathrm{Yb}}_{2}{\mathrm{Zn}}_{5}{\mathrm{O}}_{11}$ has been investigated with inelastic neutron scattering. Several nearly resolution limited modes with no observable dispersion are observed at 250 mK while, at elevated temperatures, transitions between excited levels b…

[Phys. Rev. Lett. 116, 257204] Published Fri Jun 24, 2016

]]>We argue that the magnon condensate in yttrium iron garnet may display experimentally observable superfluidity at room temperature despite the 100 times dominance of the normal density over superfluid ones. The superfluidity has a more complicated nature than in known superfluids since the U(1) symm…

[Phys. Rev. Lett. 116, 257205] Published Fri Jun 24, 2016

]]>A semiconductor quantum dot can generate highly coherent and indistinguishable single photons. However, intrinsic semiconductor dephasing mechanisms can reduce the visibility of two-photon interference. For an electron in a quantum dot, a fundamental dephasing process is the hyperfine interaction wi…

[Phys. Rev. Lett. 116, 257401] Published Fri Jun 24, 2016

]]>The sign problem is a major obstacle in quantum Monte Carlo simulations for many-body fermion systems. We examine this problem with a new perspective based on the Majorana reflection positivity and Majorana Kramers positivity. Two sufficient conditions are proven for the absence of the fermion sign …

[Phys. Rev. Lett. 116, 250601] Published Thu Jun 23, 2016

]]>We propose an inclusive search for dark photons ${A}^{\prime}$ at the LHCb experiment based on both prompt and displaced dimuon resonances. Because the couplings of the dark photon are inherited from the photon via kinetic mixing, the dark photon ${A}^{\prime}\to {\mu}^{+}{\mu}^{-}$ rate can be directly inferred from the off-shell photon ${\gamma}^{\dots}$

[Phys. Rev. Lett. 116, 251803] Published Thu Jun 23, 2016

]]>We evaluate the light, strange, and charm scalar content of the nucleon using one lattice QCD ensemble generated with two degenerate light quarks with mass fixed to their physical value. We use improved techniques to evaluate the disconnected quark loops to sufficient accuracy to determine the stran…

[Phys. Rev. Lett. 116, 252001] Published Thu Jun 23, 2016

]]>Vertical gold nanogaps are created on microtubular cavities to explore the coupling between resonant light supported by the microcavities and surface plasmons localized at the nanogaps. Selective coupling of optical axial modes and localized surface plasmons critically depends on the exact location …

[Phys. Rev. Lett. 116, 253904] Published Thu Jun 23, 2016

]]>In this Letter we report the experimental demonstration of a new temporal shaping technique for x-ray free-electron lasers (FELs). This technique is based on the use of a spectrally shaped infrared (IR) laser and allows optical control of the x-ray generation process. By accurately manipulating the …

[Phys. Rev. Lett. 116, 254801] Published Thu Jun 23, 2016

]]>The reaction that transforms ortho hydrogen molecules (parallel spins) into para hydrogen (anti-parallel spins) accelerates at low temperatures. This finding may be relevant to the ortho-para ratio in low temperature cosmic dust.

[Phys. Rev. Lett. 116, 253201] Published Wed Jun 22, 2016

]]>We report on highly reflective spin-orbit geometric phase optical elements based on a helicity-preserving circular Bragg-reflection phenomenon. First, we present a dynamical geometric phase experiment using a flat chiral Bragg mirror. Then, we show that shaping such a geometric phase allows the effi…

[Phys. Rev. Lett. 116, 253902] Published Wed Jun 22, 2016

]]>Generation of optical vortices is described in cholesteric liquid crystals with a singular point in the spatial distribution of a helix phase. The phenomenon uses the fact that a Bragg reflected light phase varies in proportion to the spatial phase of the helix, both at normal and oblique incidences…

[Phys. Rev. Lett. 116, 253903] Published Wed Jun 22, 2016

]]>We use fast transient transmission and emission spectroscopies in the pulse laser heated diamond anvil cell to probe the energy-dependent optical properties of hydrogen at pressures of 10–150 GPa and temperatures up to 6000 K. Hydrogen is absorptive at visible to near-infrared wavelengths above a th…

[Phys. Rev. Lett. 116, 255501] Published Wed Jun 22, 2016

]]>Spin textures in $\mathbf{k}$-space arising from spin-orbit coupling in noncentrosymmetric crystals find numerous applications in spintronics. We present a mechanism that leads to the appearance of $\mathbf{k}$-space spin texture due to spontaneous symmetry breaking driven by electronic correlations. Using dynamical mean…

[Phys. Rev. Lett. 116, 256403] Published Wed Jun 22, 2016

]]>The spin relaxation mechanism in single-crystalline and polycrystalline platinum (Pt) thin films is revealed by a quantum interference effect. Examining the relationship between the spin relaxation rate and momentum scattering rate by changing Pt thickness, we find that the spin relaxation rate of P…

[Phys. Rev. Lett. 116, 256802] Published Wed Jun 22, 2016

]]>Negative autoregulation is universally found across organisms. In the bacterium *Escherichia coli*, transcription factors often repress their own expression to form a negative feedback network motif that enables robustness to changes in biochemical parameters. Here we present a simple phenomenological…

[Phys. Rev. Lett. 116, 258104] Published Wed Jun 22, 2016

]]>We derive a reduced quasi-one-dimensional theory of geometrically frustrated elastic ribbons. Expressed in terms of geometric properties alone, it applies to ribbons over a wide range of scales, allowing the study of their elastic equilibrium, as well as thermal fluctuations. We use the theory to ac…

[Phys. Rev. Lett. 116, 258105] Published Wed Jun 22, 2016

]]>Clean and interacting periodically driven systems are believed to exhibit a single, trivial “infinite-temperature” Floquet-ergodic phase. In contrast, here we show that their disordered Floquet many-body localized counterparts can exhibit distinct ordered phases delineated by sharp transitions. Some…

[Phys. Rev. Lett. 116, 250401] Published Tue Jun 21, 2016

]]>In recent experiments with ion traps, long-range interactions were associated with the exceptionally fast propagation of perturbation, while in some theoretical works they have also been related with the suppression of propagation. Here, we show that such apparently contradictory behavior is caused …

[Phys. Rev. Lett. 116, 250402] Published Tue Jun 21, 2016

]]>A new technique is proposed that would allow persistent flows to be generated in dipolar Bose-Einstein condensates confined in a toroidal trap.

[Phys. Rev. Lett. 116, 250403] Published Tue Jun 21, 2016

]]>We show that three-dimensional general relativity, augmented with two vector fields, allows for a nonrelativistic limit, different from the standard limit leading to Newtonian gravity, that results in a well-defined action which is of the Chern-Simons type. We show that this three-dimensional “exten…

[Phys. Rev. Lett. 116, 251601] Published Tue Jun 21, 2016

]]>We develop a framework for studying the well-known universal term in the Rényi entropy for an arbitrary entangling region in four-dimensional conformal field theories that are holographically dual to gravitational theories. The shape dependence of the Rényi entropy ${S}_{n}$ is described by two coefficient…

[Phys. Rev. Lett. 116, 251602] Published Tue Jun 21, 2016

]]>We present a new class of models of lepton flavor in the composite Higgs framework. Following the concept of minimality, they lead to a rich phenomenology in good agreement with the current experimental picture. Because of a unification of the right-handed leptons, our scenario is very predictive an…

[Phys. Rev. Lett. 116, 251801] Published Tue Jun 21, 2016

]]>A search for radiative decays of the $P$-wave spin singlet charmonium resonance ${h}_{c}$ is performed based on $4.48\times {10}^{8}$ ${\psi}^{\prime}$ events collected with the BESIII detector operating at the BEPCII storage ring. Events of the reaction channels ${h}_{c}\to \gamma {\eta}^{\prime}$ and $\gamma \eta $ are observed with a statistical significance of $8.4\sigma $ and $\mathrm{4.\dots}$

[Phys. Rev. Lett. 116, 251802] Published Tue Jun 21, 2016

]]>High ${p}_{T}>10\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{GeV}$ elliptic flow, which is experimentally measured via the correlation between soft and hard hadrons, receives competing contributions from event-by-event fluctuations of the low-${p}_{T}$ elliptic flow and event-plane angle fluctuations in the soft sector. In this Letter, a proper account …

[Phys. Rev. Lett. 116, 252301] Published Tue Jun 21, 2016

]]>Direct or Eley-Rideal reactions between energetic ${\mathrm{N}}^{+}$ and ${\mathrm{O}}^{+}$ projectiles and O atoms, adsorbed onto Pt and Pd surfaces, are studied experimentally at incidence energies between 20 and 200 eV. The exit energies of the diatomic molecular products NO and ${\mathrm{O}}_{2}$ depend linearly on the incidence energy of the…

[Phys. Rev. Lett. 116, 253202] Published Tue Jun 21, 2016

]]>Quantum interference arising from the superposition of states is striking evidence of the validity of quantum mechanics, confirmed in many experiments and also exploited in applications. However, as for any scientific theory, quantum mechanics is valid within the limits in which it has been experime…

[Phys. Rev. Lett. 116, 253601] Published Tue Jun 21, 2016

]]>We report the broadband characterization of the propagation of light through a multiple scattering medium by means of its multispectral transmission matrix. Using a single spatial light modulator, our approach enables the full control of both the spatial and spectral properties of an ultrashort puls…

[Phys. Rev. Lett. 116, 253901] Published Tue Jun 21, 2016

]]>Self-organized spatial structures in the light emission from the ion-ion capacitive rf plasma of a strongly electronegative gas (${\mathrm{CF}}_{4}$) are observed experimentally for the first time. Their formation is analyzed and understood based on particle-based kinetic simulations. These “striations” are found t…

[Phys. Rev. Lett. 116, 255002] Published Tue Jun 21, 2016

]]>We analyze the heavy ion components ($A>4\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{amu}$) in collisionally young solar wind plasma and show that there is a clear, stable dependence of temperature on mass, probably reflecting the conditions in the solar corona. We consider both linear and power law forms for the dependence and find that a …

[Phys. Rev. Lett. 116, 255101] Published Tue Jun 21, 2016

]]>We studied the electronic and magnetic dynamics of ferromagnetic insulating ${\mathrm{BaFeO}}_{3}$ thin films by using pump-probe time-resolved resonant x-ray reflectivity at the Fe $2p$ edge. By changing the excitation density, we found two distinctly different types of demagnetization with a clear threshold behavio…

[Phys. Rev. Lett. 116, 256402] Published Tue Jun 21, 2016

]]>After more than three decades, the fractional quantum Hall effect still poses challenges to contemporary physics. Recent experiments point toward a fractal scenario for the Hall resistivity as a function of the magnetic field. Here, we consider the so-called thin-torus limit of the Hamiltonian descr…

[Phys. Rev. Lett. 116, 256803] Published Tue Jun 21, 2016

]]>Germanene—the germanium analog of graphene—can remain a topological insulator when placed on a molybdenum disulfide substrate.

[Phys. Rev. Lett. 116, 256804] Published Tue Jun 21, 2016

]]>Germanene—the germanium analog of graphene—can remain a topological insulator when placed on a molybdenum disulfide substrate.

[Phys. Rev. Lett. 116, 256805] Published Tue Jun 21, 2016

]]>We obtain the general conditions for the emergence of odd-frequency superconducting pairing in a two-dimensional (2D) electronic system proximity coupled to a superconductor, making minimal assumptions about both the 2D system and the superconductor. Using our general results we show that a simple h…

[Phys. Rev. Lett. 116, 257001] Published Tue Jun 21, 2016

]]>Weak topological phases are usually described in terms of protection by the lattice translation symmetry. Their characterization explicitly relies on periodicity since weak invariants are expressed in terms of the momentum-space torus. We prove the compatibility of weak topological superconductors w…

[Phys. Rev. Lett. 116, 257002] Published Tue Jun 21, 2016

]]>Recently, theory has predicted a Majorana zero mode (MZM) to induce spin selective Andreev reflection (SSAR), a novel magnetic property which can be used to detect the MZM. Here, spin-polarized scanning tunneling microscopy or spectroscopy has been applied to probe SSAR of MZMs in a topological supe…

[Phys. Rev. Lett. 116, 257003] Published Tue Jun 21, 2016

]]>Effects of local lattice distortions on the spin ordering are investigated for the antiferromagnetic classical Heisenberg model on the pyrochlore lattice. It is found by Monte Carlo simulations that the spin-lattice coupling (SLC) originating from site phonons induces a first-order transition into t…

[Phys. Rev. Lett. 116, 257201] Published Tue Jun 21, 2016

]]>Using femtosecond time-resolved resonant magnetic x-ray diffraction at the Ho ${L}_{3}$ absorption edge, we investigate the demagnetization dynamics in antiferromagnetically ordered metallic Ho after femtosecond optical excitation. Tuning the x-ray energy to the electric dipole ($E1$, $2p\to 5d$) or quadrupole ($E\mathrm{\dots}$

[Phys. Rev. Lett. 116, 257202] Published Tue Jun 21, 2016

]]>Properties of the depleted Heisenberg spin ladder material series $({\mathrm{C}}_{7}{\mathrm{H}}_{10}\mathrm{N}{)}_{2}{\mathrm{Cu}}_{1-z}{\mathrm{Zn}}_{z}{\mathrm{Br}}_{4}$ have been studied by the combination of magnetic measurements and neutron spectroscopy. Disorder-induced degrees of freedom lead to a specific magnetic response, described in terms of emergent strongly interacting…

[Phys. Rev. Lett. 116, 257203] Published Tue Jun 21, 2016

]]>To understand DNA elasticity at high forces ($F>30\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{pN}$), its helical nature must be taken into account, as a coupling between twist and stretch. The prevailing model, the wormlike chain, was previously extended to include this twist-stretch coupling. Motivated by DNA’s charged nature, and the know…

[Phys. Rev. Lett. 116, 258102] Published Tue Jun 21, 2016

]]>Biological systems are characterized by compartmentalization from the subcellular to the tissue level, and thus reactions in small volumes are ubiquitous in living systems. Under such conditions, statistical number fluctuations, which are commonly negligible in bulk reactions, can become dominant an…

[Phys. Rev. Lett. 116, 258103] Published Tue Jun 21, 2016

]]>The susceptible-infected-susceptible (SIS) model is a canonical model for emerging disease outbreaks. Such outbreaks are naturally modeled as taking place on networks. A theoretical challenge in network epidemiology is the dynamic correlations coming from that if one node is infected, then its neigh…

[Phys. Rev. Lett. 116, 258301] Published Tue Jun 21, 2016

]]>We present a new algorithm for classical simulation of quantum circuits over the $\text{Clifford}+T$ gate set. The runtime of the algorithm is polynomial in the number of qubits and the number of Clifford gates in the circuit but exponential in the number of $T$ gates. The exponential scaling is sufficiently m…

[Phys. Rev. Lett. 116, 250501] Published Mon Jun 20, 2016

]]>The first experimental and theoretical evidence was provided for the non-negligible role of a diffusio-osmosis in the ion concentration polarization (ICP) layer, which had been reported to be in a high Peclet number regime. Under the assumption that the hydrated shells of cations were stripped out w…

[Phys. Rev. Lett. 116, 254501] Published Mon Jun 20, 2016

]]>The spontaneous formation of magnetic islands is observed in driven, antiparallel magnetic reconnection on the Terrestrial Reconnection Experiment. We here provide direct experimental evidence that the plasmoid instability is active at the electron scale inside the ion diffusion region in a low coll…

[Phys. Rev. Lett. 116, 255001] Published Mon Jun 20, 2016

]]>We present a systematical theoretical study on the transport properties of an archetypal family of Hund’s metals, ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}$, ${\mathrm{Sr}}_{3}{\mathrm{Ru}}_{2}{\mathrm{O}}_{7}$, ${\mathrm{SrRuO}}_{3}$, and ${\mathrm{CaRuO}}_{3}$, within the combination of first principles density functional theory and dynamical mean field theory. The agreement between theory and experiments …

[Phys. Rev. Lett. 116, 256401] Published Mon Jun 20, 2016

]]>The quantum anomalous Hall (QAH) phase is a two-dimensional bulk ferromagnetic insulator with a nonzero Chern number in the presence of spin-orbit coupling (SOC) but in the absence of applied magnetic fields. Associated metallic chiral edge states host dissipationless current transport in electronic…

[Phys. Rev. Lett. 116, 256601] Published Mon Jun 20, 2016

]]>Electrons in image-potential states on the surface of bulk helium represent a unique model system of a two-dimensional electron gas. Here, we investigate their properties in the extreme case of reduced film thickness: a monolayer of helium physisorbed on a single-crystalline (111)-oriented Cu surfac…

[Phys. Rev. Lett. 116, 256801] Published Mon Jun 20, 2016

]]>We demonstrate electrical mapping of tetragonal domains and electric field-induced twin walls in ${\mathrm{SrTiO}}_{3}$ as a function of temperature and gate bias utilizing the conducting ${\mathrm{LaAlO}}_{3}/{\mathrm{SrTiO}}_{3}$ interface and low-temperature scanning electron microscopy. Conducting twin walls appear below 105 K, and new twin…

[Phys. Rev. Lett. 116, 257601] Published Mon Jun 20, 2016

]]>Capillary forces drive the self-assembly of cube-shaped colloids at fluid-fluid interfaces.

[Phys. Rev. Lett. 116, 258001] Published Mon Jun 20, 2016

]]>A tiny conical deformation in a channel embedded in a lipid membrane can give rise to a significant energy release when the channel opens.

[Phys. Rev. Lett. 116, 258101] Published Mon Jun 20, 2016

]]>Understanding the resource consumption in distributed scenarios is one of the main goals of quantum information theory. A prominent example for such a scenario is the task of quantum state merging, where two parties aim to merge their tripartite quantum state parts. In standard quantum state merging…

[Phys. Rev. Lett. 116, 240405] Published Fri Jun 17, 2016

]]>A stability analysis is presented for boundary-driven and out-of-equilibrium systems in the framework of the hydrodynamic macroscopic fluctuation theory. A Hamiltonian description is proposed which allows us to thermodynamically interpret the additivity principle. A necessary and sufficient conditio…

[Phys. Rev. Lett. 116, 240603] Published Fri Jun 17, 2016

]]>A single confined atom can sense alternating magnetic fields at the standard quantum limit with nanometer resolution.

[Phys. Rev. Lett. 116, 240801] Published Fri Jun 17, 2016

]]>The aLIGO detection of the black-hole binary GW150914 opens a new era for probing extreme gravity. Many gravity theories predict the emission of dipole gravitational radiation by binaries. This is excluded to high accuracy in binary pulsars, but entire classes of theories predict this effect predomi…

[Phys. Rev. Lett. 116, 241104] Published Fri Jun 17, 2016

]]>Discrepancies in the positron content of cosmic rays measured at different times are explained by the periodic reversal of the solar magnetic field’s direction.

[Phys. Rev. Lett. 116, 241105] Published Fri Jun 17, 2016

]]>Charm meson oscillations are observed in a time-dependent analysis of the ratio of ${D}^{0}\to {K}^{+}{\pi}^{-}{\pi}^{+}{\pi}^{-}$ to ${D}^{0}\to {K}^{-}{\pi}^{+}{\pi}^{-}{\pi}^{+}$ decay rates, using data corresponding to an integrated luminosity of $3.0\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{fb}}^{-1}$ recorded by the LHCb experiment. The measurements presented are sensitive to the phase-space averaged ratio of …

[Phys. Rev. Lett. 116, 241801] Published Fri Jun 17, 2016

]]>We propose a new approach to the resummation of the transverse-momentum distribution of a high-mass color-singlet system in hadronic collisions. The resummation is performed in momentum space and is free of kinematic singularities at small transverse momentum. We derive a formula accurate at the nex…

[Phys. Rev. Lett. 116, 242001] Published Fri Jun 17, 2016

]]>A finite-range atomic interaction can be generated via resonant two-photon excitation in a cold gas of Strontium atoms.

[Phys. Rev. Lett. 116, 243001] Published Fri Jun 17, 2016

]]>Stochastic processes with absorbing states feature examples of nonequilibrium universal phenomena. While the classical regime has been thoroughly investigated in the past, relatively little is known about the behavior of these nonequilibrium systems in the presence of quantum fluctuations. Here, we …

[Phys. Rev. Lett. 116, 245701] Published Fri Jun 17, 2016

]]>The development of new nanocrystals with outstanding physicochemical properties requires a full three-dimensional (3D) characterization at the atomic scale. For homogeneous nanocrystals, counting the number of atoms in each atomic column from high angle annular dark field scanning transmission elect…

[Phys. Rev. Lett. 116, 246101] Published Fri Jun 17, 2016

]]>Following the recent observation of localized phonon polaritons in user-defined silicon carbide nanoresonators, here we demonstrate strong and coherent coupling between those localized modes and propagating phonon polaritons bound to the surface of the nanoresonator’s substrate. In order to obtain p…

[Phys. Rev. Lett. 116, 246402] Published Fri Jun 17, 2016

]]>Recently, there have been increasingly hot debates on whether a bulk Fermi surface of charge-neutral excitations exists in the topological Kondo insulator ${\mathrm{SmB}}_{6}$. To unambiguously resolve this issue, we perform the low-temperature thermal conductivity measurements of a high-quality ${\mathrm{SmB}}_{6}$ single crystal…

[Phys. Rev. Lett. 116, 246403] Published Fri Jun 17, 2016

]]>We use neutron scattering to study spin excitations in single crystals of ${\mathrm{LiFe}}_{0.88}{\mathrm{Co}}_{0.12}\mathrm{As}$, which is located near the boundary of the superconducting phase of ${\mathrm{LiFe}}_{1-x}{\mathrm{Co}}_{x}\mathrm{As}$ and exhibits non-Fermi-liquid behavior indicative of a quantum critical point. By comparing spin excitations of ${\mathrm{LiFe}}_{0.88}{\mathrm{Co}}_{0.12}\mathrm{As}$…

[Phys. Rev. Lett. 116, 247001] Published Fri Jun 17, 2016

]]>We provide evidence that spin ferroquadrupolar (FQ) order is the likely ground state in the nonmagnetic nematic phase of stoichiometric FeSe. By studying the variational mean-field phase diagram of a bilinear-biquadratic Heisenberg model up to the 2nd nearest neighbor, we find the FQ phase in close …

[Phys. Rev. Lett. 116, 247203] Published Fri Jun 17, 2016

]]>The eigenstates of many-body localized (MBL) Hamiltonians exhibit low entanglement. We adapt the highly successful density-matrix renormalization group method, which is usually used to find modestly entangled ground states of local Hamiltonians, to find individual highly excited eigenstates of MBL H…

[Phys. Rev. Lett. 116, 247204] Published Fri Jun 17, 2016

]]>The narrow emission of a single carbon nanotube at low temperature is coupled to the optical mode of a fiber microcavity using the built-in spatial and spectral matching brought by this flexible geometry. A thorough cw and time-resolved investigation of the very same emitter both in free space and i…

[Phys. Rev. Lett. 116, 247402] Published Fri Jun 17, 2016

]]>Myosin motor proteins drive vigorous steady-state fluctuations in the actin cytoskeleton of cells. Endogenous embedded semiflexible filaments such as microtubules, or added filaments such as single-walled carbon nanotubes are used as novel tools to noninvasively track equilibrium and nonequilibrium …

[Phys. Rev. Lett. 116, 248301] Published Fri Jun 17, 2016

]]>[Phys. Rev. Lett. 116, 249701] Published Fri Jun 17, 2016

]]>[Phys. Rev. Lett. 116, 249702] Published Fri Jun 17, 2016

]]>By generalizing concepts from classical stochastic dynamics, we establish the basis for a theory of metastability in Markovian open quantum systems. Partial relaxation into long-lived metastable states—distinct from the asymptotic stationary state—is a manifestation of a separation of time scales du…

[Phys. Rev. Lett. 116, 240404] Published Thu Jun 16, 2016

]]>Bath engineering, which utilizes coupling to lossy modes in a quantum system to generate nontrivial steady states, is a tantalizing alternative to gate- and measurement-based quantum science. Here, we demonstrate dissipative stabilization of entanglement between two superconducting transmon qubits i…

[Phys. Rev. Lett. 116, 240503] Published Thu Jun 16, 2016

]]>Experiments place tighter bounds on neutron capture rates that play an important role in the production of heavy elements in the Universe.

[Phys. Rev. Lett. 116, 242502] Published Thu Jun 16, 2016

]]>Atomic disorder in irradiated materials is investigated by means of x-ray diffraction, using cubic SiC single crystals as a model material. It is shown that, besides the determination of depth-resolved strain and damage profiles, x-ray diffraction can be efficiently used to determine the probability…

[Phys. Rev. Lett. 116, 245501] Published Thu Jun 16, 2016

]]>We show that noncontact atomic force microscopy (AFM) is sensitive to the local stiffness in the atomic-scale limit on weakly coupled 2D materials, as graphene on metals. Our large amplitude AFM topography and dissipation images under ultrahigh vacuum and low temperature resolve the atomic and moiré…

[Phys. Rev. Lett. 116, 245502] Published Thu Jun 16, 2016

]]>LIGO has detected a second burst of gravitational waves from merging black holes, suggesting that such detections will soon become routine and part of a new kind of astronomy.

[Phys. Rev. Lett. 116, 241103] Published Wed Jun 15, 2016

]]>Violations of $CPT$ symmetry and Lorentz invariance are searched for by studying interference effects in ${B}^{0}$ mixing and in ${B}_{s}^{0}$ mixing. Samples of ${B}^{0}\to J/\psi {K}_{S}^{0}$ and ${B}_{s}^{0}\to J/\psi {K}^{+}{K}^{-}$ decays are recorded by the LHCb detector in proton-proton collisions at center-of-mass energies of 7 and 8 TeV, corresponding to an…

[Phys. Rev. Lett. 116, 241601] Published Wed Jun 15, 2016

]]>Sinusoidal Bloch oscillations appear in band structures exposed to external fields. Landau-Zener (LZ) tunneling between different bands is usually a counteracting effect limiting Bloch oscillations. Here we consider a flat band network with two dispersive and one flat band, e.g., for ultracold atoms…

[Phys. Rev. Lett. 116, 245301] Published Wed Jun 15, 2016

]]>[Phys. Rev. Lett. 116, 249902] Published Wed Jun 15, 2016

]]>We investigate cold bosonic impurity atoms trapped in a vortex lattice formed by condensed bosons of another species. We describe the dynamics of the impurities by a bosonic Hubbard model containing occupation-dependent parameters to capture the effects of strong impurity-impurity interactions. Thes…

[Phys. Rev. Lett. 116, 240402] Published Tue Jun 14, 2016

]]>The time-dependent energy transfer in a driven quantum system strongly coupled to a heat bath is studied within an influence functional approach. Exact formal expressions for the statistics of energy dissipation into the different channels are derived. The general method is applied to the driven dis…

[Phys. Rev. Lett. 116, 240403] Published Tue Jun 14, 2016

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