Article
Physics, Multidisciplinary
Yadong Song, Cunxi Zhang, Yunqing Zhou
Summary: This study investigates the universal properties of mass-imbalanced highly polarized Fermi gases in one-dimensional scenarios. The binding energy, quasiparticle residue, and correlation functions of the systems are examined by treating the mass ratio as a parameter. The study demonstrates the existence of molecular states in one-dimensional polaron systems with strong attractive interactions, contrary to previous conclusions.
Article
Quantum Science & Technology
Giovanni Pecci, Piero Naldesi, Anna Minguzzi, Luigi Amico
Summary: In quantum mechanics, each particle is described by a complex valued wave-function characterized by amplitude and phase. When many particles interact, a specific quantum coherence known as many-body quantum coherence can emerge. This article demonstrates the interplay between single-particle's phase coherence and many-body quantum coherence by studying the time-dependent interference of an interacting degenerate Fermi gas. The results show distinct features of single-particle phase coherence and many-body quantum coherence in the interferogram.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Organic
Krzysztof Gorski, Irena Deperasinska, Glib Baryshnikov, Shuhei Ozaki, Kenji Kamada, Hans Agren, Daniel T. Gryko
Summary: The fluorescence and other photophysical parameters of highly polarized, quadrupolar bis-coumarins are highly dependent on the linking position between both chromophores. Delocalization of the LUMO on the entire pi-system leads to intense emission and strong two-photon absorption.
Article
Optics
Lukas Rammelmueller, Yaqi Hou, Joaquin E. Drut, Jens Braun
Summary: We theoretically study the pairing behavior of the unitary Fermi gas in the normal phase, with analysis based on spin susceptibility response to an external magnetic field. Our findings are discussed in context of the phase diagram of the spin-polarized unitary Fermi gas.
Article
Physics, Multidisciplinary
Jordi Pera, Joaquim Casulleras, Jordi Boronat
Summary: We present exact analytic results for the energy of a SU(N) repulsive Fermi gas as a function of the spin-channel occupation at second order in the gas parameter. This is an extension of previous results that now incorporates the degree of polarization of the system. The magnetic properties of the gas can be obtained, free from numerical uncertainties. Estimations for Fermi gases of Yb and Sr with spin 5/2 and 9/2, respectively, are reported.
Article
Physics, Multidisciplinary
Ahana Chakraborty, Rajdeep Sensarma
Summary: This study introduces a new field theoretic method for calculating Renyi entropy of interacting bosons in subsystems without using replica methods. The method can be applied to dynamics of open and closed quantum systems, and can determine the relationship between the initial state and final density matrix to predict the behavior of entropy over time. The approach also shows that the entropy in non-Markovian dynamics approaches a steady-state value with exponents determined by nonanalyticities of the system's environment.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
M. Pini, P. Pieri, G. Calvanese Strinati
Summary: This study analyzes the evolution of an attractive polarized two-component Fermi gas at zero temperature as its polarization is gradually decreased from full polarization to a critical polarization where superfluidity occurs. The critical polarization and the associated superfluid instability are determined using a fully self-consistent t-matrix approach at zero temperature, constructing the polarization-vs-coupling phase diagram throughout the BCS-BEC crossover. The superfluid instability can lead to either a Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) phase or a standard polarized BCS phase depending on the interparticle interaction strength between the two components. The behavior of the quasiparticle parameters in the normal Fermi gas varies significantly between the two cases.
Article
Mechanics
Yunzhu Li, Zhen Li, Rui Yang, Yuxin Zhao, Bo Zhang
Summary: This paper studies the variations of flow parameters after normal shock in supercritical fluids and provides empirical equations for predicting the normal shock pressure ratio and density ratio.
Article
Optics
J. R. M. de Nova, F. Sols
Summary: This article proposes the concept of a spontaneous many-body Floquet state, which self-oscillates without external periodic driving and exhibits continuous spontaneous symmetry breaking. The study demonstrates the existence of spontaneous many-body Floquet states in various canonical many-body problems and suggests experimental scenarios for their observation.
Article
Physics, Applied
Xinlu Li, Meng Zhu, Yaoyuan Wang, Fanxing Zheng, Jianting Dong, Ye Zhou, Long You, Jia Zhang
Summary: Recently, the research on van der Waals magnetic heterostructures in spintronics has increased. However, the lack of room-temperature magnetic order in vdW materials has hindered their practical development in spintronic devices. Inspired by the discovery of vdW ferromagnet Fe3GaTe2, which exhibits magnetic order above room temperature and significant perpendicular magnetic anisotropy, the electronic structure, magnetic properties, and tunneling magnetoresistance effect in magnetic tunnel junctions (MTJs) with Fe3GaTe2/insulator/Fe3GaTe2 structure were investigated using first-principles calculations. The results show that Fe3GaTe2-based MTJs have a prominent tunneling magnetoresistance effect at room temperature, comparable to conventional AlOx and MgO-based MTJs. This suggests that Fe3GaTe2-based MTJs could be a promising candidate for realizing long-awaited full magnetic vdW spintronic devices.
APPLIED PHYSICS LETTERS
(2023)
Review
Physics, Multidisciplinary
Irenee Frerot, Matteo Fadel, Maciej Lewenstein
Summary: This review discusses methods for detecting and characterizing quantum correlations in many-body systems, with a focus on scalable approaches. It introduces concepts such as quantum entanglement, Einstein-Podolsky-Rosen steering, and Bell nonlocality, both in the bipartite scenario and their generalizations to multipartite cases. The review also covers recent progress in characterizing quantum correlations, experimental techniques for preparing and measuring highly-entangled many-body systems, and the challenges associated with each platform. It concludes with a list of open problems in the field.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Article
Chemistry, Physical
Onur Caylak, Bjorn Baumeier
Summary: The study focuses on gas-phase geometry optimization of molecules in excited states using many-body Green's functions theory within the GW approximation and the Bethe-Salpeter equation. The results show good agreement with higher-order wave function methods for structural parameters, indicating the efficiency of the GW-BSE method in providing accurate excitation energies and geometries.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2021)
Article
Computer Science, Information Systems
Haq Nawaz, Ahmad Umar Niazi, Ahsen Tahir, Noman Ahmad, Usman Masud, Turke Althobaiti, Abdullah Alhumaidi Alotaibi, Naeem Ramzan
Summary: This work presents a unidirectional, co-circularly polarized printed antenna with highly decoupled transmit and receive ports, specifically designed for 2.4 GHz in-band full duplex applications. The antenna achieves effective suppression of self interference and residual interference through balanced excitation and feeding networks.
Article
Materials Science, Multidisciplinary
Yuan -Hang Zhang, Massimiliano Di Ventra
Summary: Inspired by transformers, TQS is a versatile machine learning model for quantum many-body problems, capable of generating phase diagrams, predicting experimental measurements, and adapting to new systems. It produces accurate results with small computational cost and can be easily adapted to new tasks, making it a general-purpose model for challenging quantum problems.
Article
Quantum Science & Technology
Hong Lai, Josef Pieprzyk, Lei Pan
Summary: Tensor network states, especially matrix product states (MPS), have been proposed for studying quantum many-body systems. However, a dynamic and compressed quantum many-body state secret sharing scheme has not been proposed yet. This paper presents a scheme based on site-independent matrix product states, which can bridge the gap between large shared quantum states, limited quantum storage resources, and dynamically changing participants. The scheme allows faithful compression of quantum secret states, dynamic adjustments through tensor operations, and efficient sharing of quantum data in a multipartite manner.
QUANTUM INFORMATION PROCESSING
(2022)
