#### Physical Review Letters

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ISSN / EISSN : 0031-9007 / 1079-7114
Total articles ≅ 130,911
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#### Latest articles in this journal

Jakob Hinney, Adarsh S. Prasad, , , Arno Rauschenbeutel, , Jürgen Volz,
Published: 14 September 2021
Physical Review Letters, Volume 127; https://doi.org/10.1103/physrevlett.127.123602

Abstract:
We observe that a weak guided light field transmitted through an ensemble of atoms coupled to an optical nanofiber exhibits quadrature squeezing. From the measured squeezing spectrum we gain direct access to the phase and amplitude of the energy-time entangled part of the two-photon wave function which arises from the strongly correlated transport of photons through the ensemble. For small atomic ensembles we observe a spectrum close to the line shape of the atomic transition, while sidebands are observed for sufficiently large ensembles, in agreement with our theoretical predictions. Furthermore, we vary the detuning of the probe light with respect to the atomic resonance and infer the phase of the entangled two-photon wave function. From the amplitude and the phase of the spectrum, we reconstruct the real and imaginary part of the time-domain wave function. Our characterization of the entangled two-photon component constitutes a diagnostic tool for quantum optics devices.
Kohei Shiota, Akito Inui, Yuta Hosaka, Ryoga Amano, Yoshichika Ōnuki, Masato Hedo, Takao Nakama, , Jun-Ichiro Ohe, Jun-Ichiro Kishine, et al.
Published: 14 September 2021
Physical Review Letters, Volume 127; https://doi.org/10.1103/physrevlett.127.126602

Abstract:
A spin-polarized state is examined under charge current at room temperature without magnetic fields in chiral disilicide crystals ${\mathrm{NbSi}}_{2}$ and ${\mathrm{TaSi}}_{2}$. We found that a long-range spin transport occurs over ten micrometers in these inorganic crystals. A distribution of crystalline grains of different handedness is obtained via location-sensitive electrical transport measurements. The sum rule holds in the conversion coefficient in the current-voltage characteristics. A diamagnetic nature of the crystals supports that the spin polarization is not due to localized electron spins but due to itinerant electron spins. A large difference in the strength of antisymmetric spin-orbit interaction associated with $4d$ electrons in Nb and $5d$ ones in Ta is oppositely correlated with that of the spin polarization. A robust protection of the spin polarization occurs over long distances in chiral crystals.
Ke Zhang, Shixuan Zhao, Zhanyang Hao, Shiv Kumar, , Yingjie Zhang, Hongyi Sun, Yuan Wang, Yujie Hao, XiaoMing Ma, et al.
Published: 14 September 2021
Physical Review Letters, Volume 127; https://doi.org/10.1103/physrevlett.127.126402

Abstract:
The spin polarization in nonmagnetic materials is conventionally attributed to the outcome of spin-orbit coupling when the global inversion symmetry is broken. The recently discovered hidden spin polarization indicates that a specific atomic site asymmetry could also induce measurable spin polarization, leading to a paradigm shift in research on centrosymmetric crystals for potential spintronic applications. Here, combining spin- and angle-resolved photoemission spectroscopy and theoretical calculations, we report distinct spin-momentum-layer locking phenomena in a centrosymmetric, layered material, BiOI. The measured spin is highly polarized along the Brillouin zone boundary, while the same effect almost vanishes around the zone center due to its nonsymmorphic crystal structure. Our work demonstrates the existence of momentum-dependent hidden spin polarization and uncovers the microscopic mechanism of spin, momentum, and layer locking to each other, thus shedding light on the design metrics for future spintronic materials.
Published: 14 September 2021
Physical Review Letters, Volume 127; https://doi.org/10.1103/physrevlett.127.120601

Abstract:
In usual diffusion, the concentration profile, starting from an initial distribution showing sharp features, first gets smooth and then converges to a Gaussian. By considering several examples, we show that the art of convergence to a Gaussian in diffusion in disordered media with infinite contrast may be strikingly different: sharp features of initial distribution do not smooth out at long times. This peculiarity of the strong disorder may be of importance for diagnostics of disorder in complex, e.g., biological, systems.
, Eduardo Gonzalez Lazo, Marcello Dalmonte, Antonello Scardicchio, Jakub Zakrzewski
Published: 14 September 2021
Physical Review Letters, Volume 127; https://doi.org/10.1103/physrevlett.127.126603

Abstract:
We study the impact of quenched disorder on the dynamics of locally constrained quantum spin chains, that describe 1D arrays of Rydberg atoms in both the frozen (Ising-type) and dressed ($XY$-type) regime. Performing large-scale numerical experiments, we observe no trace of many-body localization even at large disorder. Analyzing the role of quenched disorder terms in constrained systems we show that they act in two, distinct and competing ways: as an on-site disorder term for the basic excitations of the system, and as an interaction between excitations. The two contributions are of the same order, and as they compete (one towards localization, the other against it), one does never enter a truly strong disorder, weak interaction limit, where many-body localization occurs. Such a mechanism is further clarified in the case of XY-type constrained models: there, a term which would represent a bona fide local quenched disorder term acting on the excitations of the clean model must be written as a series of nonlocal terms in the unconstrained variables. Our observations provide a simple picture to interpret the role of quenched disorder that could be immediately extended to other constrained models or quenched gauge theories.
Published: 14 September 2021
Physical Review Letters, Volume 127; https://doi.org/10.1103/physrevlett.127.123603

Abstract:
The optomechanical character of molecules was discovered by Raman about one century ago. Today, molecules are promising contenders for high-performance quantum optomechanical platforms because their small size and large energy-level separations make them intrinsically robust against thermal agitations. Moreover, the precision and throughput of chemical synthesis can ensure a viable route to quantum technological applications. The challenge, however, is that the coupling of molecular vibrations to environmental phonons limits their coherence to picosecond time scales. Here, we improve the optomechanical quality of a molecule by several orders of magnitude through phononic engineering of its surrounding. By dressing a molecule with long-lived high-frequency phonon modes of its nanoscopic environment, we achieve storage and retrieval of photons at millisecond timescales and allow for the emergence of single-photon strong coupling in optomechanics. Our strategy can be extended to the realization of molecular optomechanical networks.
Published: 14 September 2021
Physical Review Letters, Volume 127; https://doi.org/10.1103/physrevlett.127.122301

Abstract:
We explore the out-of-equilibrium dynamics of the quark-gluon plasma at zero and finite net-baryon density based on an effective kinetic theory of quantum chromodynamics (QCD). By investigating the isotropization of the longitudinal pressure, we determine the relevant time and temperature scales for the onset of viscous hydrodynamics and quantify the dependence on the chemical composition of the quark-gluon plasma. By extrapolating our results to realistic coupling strength, we discuss phenomenological consequences regarding the role of the preequilibrium phase at different collision energies.
Sander A. Mann,
Published: 13 September 2021
Physical Review Letters, Volume 127; https://doi.org/10.1103/physrevlett.127.123601

Abstract:
Topological photonic insulators have attracted significant attention for their robust transport of light, impervious to scattering and disorder. This feature is ideally suited for slow light applications, which are typically limited by disorder-induced attenuation. However, no practical approach to broadband topologically protected slow light has been demonstrated yet. In this work, we achieve slow light in topologically unidirectional waveguides based on periodically loading an edge termination with suitably tailored resonances. The resulting edge state dispersion can wind around the Brillouin zone multiple times sustaining broadband, topologically robust slow light, opening exciting opportunities in various photonic scenarios.
D. J. Schlossberg, G. P. Grim, D. T. Casey, A. S. Moore, , , L. R. Benedetti, R. M. Bionta, M. J. Eckart, J. E. Field, et al.
Published: 13 September 2021
Physical Review Letters, Volume 127; https://doi.org/10.1103/physrevlett.127.125001

Abstract:
Inertial confinement fusion implosions designed to have minimal fluid motion at peak compression often show significant linear flows in the laboratory, attributable per simulations to percent-level imbalances in the laser drive illumination symmetry. We present experimental results which intentionally varied the mode 1 drive imbalance by up to 4% to test hydrodynamic predictions of flows and the resultant imploded core asymmetries and performance, as measured by a combination of DT neutron spectroscopy and high-resolution x-ray core imaging. Neutron yields decrease by up to 50%, and anisotropic neutron Doppler broadening increases by 20%, in agreement with simulations. Furthermore, a tracer jet from the capsule fill-tube perturbation that is entrained by the hot-spot flow confirms the average flow speeds deduced from neutron spectroscopy.
Xiangpeng Luo, Dimuthu Obeysekera, Choongjae Won, Suk Hyun Sung, Noah Schnitzer, Robert Hovden, Sang-Wook Cheong, Junjie Yang, Kai Sun,
Published: 13 September 2021
Physical Review Letters, Volume 127; https://doi.org/10.1103/physrevlett.127.126401

Abstract:
We show the ferro-rotational nature of the commensurate charge density wave (CCDW) in $1T\text{−}{\mathrm{TaS}}_{2}$ and track its dynamic modulations by temperature-dependent and time-resolved electric quadrupole rotation anisotropy-second harmonic generation (EQ RA-SHG), respectively. The ultrafast modulations manifest as the breathing and the rotation of the EQ RA-SHG patterns at three frequencies around the reported single CCDW amplitude mode frequency. A sudden shift of the triplet frequencies and a dramatic increase in the breathing and rotation magnitude further reveal a photoinduced transient CDW phase across a critical pump fluence of $\sim 0.5\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{mJ}/\mathrm{cm}}^{2}$.