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Showing results 1 to 20 of 108
   Casimir Self-Interaction Energy Density of Quantum Electrodynamic FieldsTkatchenko, Alexandre  ; Fedorov, Dmitry in Physical Review Letters (2023) Detailed reference viewed: 56 (2 UL)One-Dimensional Quantum Systems with Ground State of Jastrow Form Are IntegrableYang, Jing ; Del Campo Echevarria, Adolfo in Physical Review Letters (2022) Exchange operator formalism describes many-body integrable systems using phase-space variables involving an exchange operator that acts on any pair of particles. We establish an equivalence between models ... [more ▼] Exchange operator formalism describes many-body integrable systems using phase-space variables involving an exchange operator that acts on any pair of particles. We establish an equivalence between models described by exchange operator formalism and the complete infinite family of parent Hamiltonians describing quantum many-body models with ground states of Jastrow form. This makes it possible to identify the invariants of motion for any model in the family and establish its integrability, even in the presence of an external potential. Using this construction we establish the integrability of the long-range Lieb-Liniger model, describing bosons in a harmonic trap and subject to contact and Coulomb interactions in one dimension.We further identify a variety of models exemplifying the integrability of Hamiltonians in this family. [less ▲] Detailed reference viewed: 47 (1 UL)Thermodynamic Control of Activity Patterns in Cytoskeletal Networks; ; Fodor, Etienne et alin Physical Review Letters (2022) Biological materials, such as the actin cytoskeleton, exhibit remarkable structural adaptability to various external stimuli by consuming different amounts of energy. In this Letter, we use methods from ... [more ▼] Biological materials, such as the actin cytoskeleton, exhibit remarkable structural adaptability to various external stimuli by consuming different amounts of energy. In this Letter, we use methods from large deviation theory to identify a thermodynamic control principle for structural transitions in a model cytoskeletal network. Specifically, we demonstrate that biasing the dynamics with respect to the work done by nonequilibrium components effectively renormalizes the interaction strength between such components, which can eventually result in a morphological transition. Our work demonstrates how a thermodynamic quantity can be used to renormalize effective interactions, which in turn can tune structure in a predictable manner, suggesting a thermodynamic principle for the control of cytoskeletal structure and dynamics. [less ▲] Detailed reference viewed: 21 (1 UL)Comment on “Dispersion Interaction between Two Hydrogen Atoms in a Static Electric Field”Karimpour, Mohammad Reza ; Fedorov, Dmitry ; Tkatchenko, Alexandre in Physical Review Letters (2022) Detailed reference viewed: 134 (8 UL)Spectral Filtering Induced by Non-Hermitian Evolution with Balanced Gain and Loss: Enhancing Quantum ChaosChenu, Aurélia ; Del Campo Echevarria, Adolfo ; et alin Physical Review Letters (2022) Detailed reference viewed: 34 (2 UL)Colossal Enhancement of Atomic Force Response in van der Waals Materials Arising from Many-Body Electronic Correlations; ; Bordas, Stéphane et alin Physical Review Letters (2022) Detailed reference viewed: 31 (0 UL)Four-Dimensional Scaling of Dipole Polarizability in Quantum SystemsSzabo, Peter ; Goger, Szabolcs ; Charry Martinez, Jorge Alfonso et alin Physical Review Letters (2022) Detailed reference viewed: 109 (10 UL) Structural Chirality of Polar Skyrmions Probed by Resonant Elastic X-Ray Scattering; Iñiguez, Jorge ; et alin Physical Review Letters (2022) Detailed reference viewed: 12 (0 UL)Variational principle for optimal quantum controls in quantum metrologyYang, Jing ; ; et alin Physical Review Letters (2022) We develop a variational principle to determine the quantum controls and initial state that optimizes the quantum Fisher information, the quantity characterizing the precision in quantum metrology. When ... [more ▼] We develop a variational principle to determine the quantum controls and initial state that optimizes the quantum Fisher information, the quantity characterizing the precision in quantum metrology. When the set of available controls is limited, the exact optimal initial state and the optimal controls are, in general, dependent on the probe time, a feature missing in the unrestricted case. Yet, for time-independent Hamiltonians with restricted controls, the problem can be approximately reduced to the unconstrained case via Floquet engineering. In particular, we find for magnetometry with a time-independent spin chain containing three-body interactions, even when the controls are restricted to one- and two-body interaction, that the Heisenberg scaling can still be approximately achieved. Our results open the door to investigate quantum metrology under a limited set of available controls, of relevance to many-body quantum metrology in realistic scenarios. [less ▲] Detailed reference viewed: 20 (0 UL)Finite-Time Dynamical Phase Transition in Nonequilibrium RelaxationMeibohm, Jan Nicolas ; Esposito, Massimiliano in Physical Review Letters (2022), 128(11), 110603 Detailed reference viewed: 10 (1 UL)Maxwell Demon that Can Work at Macroscopic Scales; Esposito, Massimiliano in Physical Review Letters (2022), 129(12), 120602 Detailed reference viewed: 23 (1 UL)Probing Quantum Speed Limits with Ultracold GasesDel Campo Echevarria, Adolfo in Physical Review Letters (2021) Quantum speed limits (QSLs) rule the minimum time for a quantum state to evolve into a distinguishable state in an arbitrary physical process. These fundamental results constrain a notion of distance ... [more ▼] Quantum speed limits (QSLs) rule the minimum time for a quantum state to evolve into a distinguishable state in an arbitrary physical process. These fundamental results constrain a notion of distance traveled by the quantum state, known as the Bures angle, in terms of the speed of evolution set by nonadiabatic energy fluctuations. I theoretically propose how to measure QSLs in an ultracold quantum gas confined in a timedependent harmonic trap. In this highly-dimensional system of continuous variables, quantum tomography is prohibited. Yet, QSLs can be probed whenever the dynamics is self-similar by measuring as a function of time the cloud size of the ultracold gas. This makes it possible to determine the Bures angle and energy fluctuations, as I discuss for various ultracold atomic systems. [less ▲] Detailed reference viewed: 57 (2 UL)Magneto-optical activity in nonmagnetic hyperbolic nanoparticles; ; et al in Physical Review Letters (2021), 127 Active nanophotonics can be realized by controlling the optical properties of materials with external magnetic fields. Here, we explore the influence of optical anisotropy on the magneto-optical activity ... [more ▼] Active nanophotonics can be realized by controlling the optical properties of materials with external magnetic fields. Here, we explore the influence of optical anisotropy on the magneto-optical activity in non-magnetic hyperbolic nanoparticles. We demonstrate that the magneto-optical response is driven by fundamental electric and magnetic dipole modes induced by the hyperbolic dispersion. Magnetic circular dichroism experiments confirm the theoretical predictions and reveal tunable magneto-optical activity across the visible and near infrared spectral range. [less ▲] Detailed reference viewed: 143 (12 UL)Dissipation-Time Uncertainty RelationFalasco, Gianmaria ; Esposito, Massimiliano in Physical Review Letters (2020), 125(12), 120604 Detailed reference viewed: 63 (0 UL)Toward Understanding Complex Spin Textures in Nanoparticles by Magnetic Neutron Scattering; ; et al in Physical Review Letters (2020), 125 Detailed reference viewed: 81 (4 UL)Archetypal Soft-Mode-Driven Antipolar Transition in Francisite Cu3Bi(SeO3)(2)O2Cl; Toulouse, Constance ; et alin PHYSICAL REVIEW LETTERS (2020), 124(9), 097603-6 Model materials are precious test cases for elementary theories and provide building blocks for the understanding of more complex cases. Here, we describe the lattice dynamics of the structural phase ... [more ▼] Model materials are precious test cases for elementary theories and provide building blocks for the understanding of more complex cases. Here, we describe the lattice dynamics of the structural phase transition in francisite Cu3Bi(SeO3)(2)O2Cl at 115 K and show that it provides a rare archetype of a transition driven by a soft antipolar phonon mode. In the high-symmetry phase at high temperatures, the soft mode is found at (0,0,0.5) at the Brillouin zone boundary and is measured by inelastic x-ray scattering and thermal diffuse scattering. In the low-symmetry phase, this soft-mode is folded back onto the center of the Brillouin zone as a result of the doubling of the unit cell, and appears as a fully symmetric mode that can be tracked by Raman spectroscopy. On both sides of the transition, the mode energy squared follows a linear behavior over a large temperature range. First-principles calculations reveal that, surprisingly, the flat phonon band calculated for the high-symmetry phase seems incompatible with the displacive character found experimentally. We discuss this unusual behavior in the context of an ideal Kittel model of an antiferroelectric transition. [less ▲] Detailed reference viewed: 52 (5 UL)Density Functional Model for van der Waals Interactions: Unifying Many-Body Atomic Approaches with Nonlocal Functionals; Tkatchenko, Alexandre in Physical Review Letters (2020) Detailed reference viewed: 112 (2 UL)Archetypal Soft-Mode-Driven Antipolar Transition in Francisite Cu3BiðSeO3Þ2O2Cl; Toulouse, Constance ; et alin Physical Review Letters (2020) Detailed reference viewed: 54 (0 UL)Work Statistics across a Quantum Phase Transition; ; Cavina, Vasco et alin Physical Review Letters (2020), 124(17), 170603 Detailed reference viewed: 73 (5 UL)Density Functional Model for van der Waals Interactions: Unifying Many-Body Atomic Approaches with Nonlocal Functionals; Tkatchenko, Alexandre in Physical Review Letters (2020) Detailed reference viewed: 78 (1 UL) |
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