Article
Physics, Multidisciplinary
S. Baryshev, A. Zasedatelev, H. Sigurdsson, I Gnusov, J. D. Topfer, A. Askitopoulos, P. G. Lagoudakis
Summary: In this study, we conducted full polarization tomography on photon correlations in a spinor exciton-polariton condensate. Our measurements demonstrate the different forms of condensate pseudospin mean-field dynamics and their intrinsic relation to the condensate photon statistics.
PHYSICAL REVIEW LETTERS
(2022)
Article
Computer Science, Interdisciplinary Applications
Yongyong Cai, Wei Liu
Summary: An accurate and efficient normalized gradient flow method is developed for computing the ground state of a spinor Bose-Einstein condensate with an arbitrary positive integer spin, with constraints on mass and magnetization. The method involves introducing Lagrange multipliers and using a semi-implicit Euler time discretization scheme, allowing for inexact projections. The numerical results for spin-1, spin-2, and spin-3 cases demonstrate the accuracy and effectiveness of the algorithm.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Energy & Fuels
Louis Lamarche
Summary: This paper provides new insights on the configuration of coaxial heat exchangers in ground heat exchangers, giving a new understanding of the effective borehole resistance through analytical models validated with numerical simulations.
Article
Physics, Multidisciplinary
Karol Gietka, Farokh Mivehvar, Thomas Busch
Summary: A novel composite light-matter magnetometer is proposed, using a multi-component Bose-Einstein condensate coupled to two distinct electromagnetic modes of a linear cavity for magnetic field measurement. The sensitivity of this magnetometer exhibits Heisenberg-like scaling with respect to the atom number, with a calculated lower bound for sensitivity at the order of fT (root Hz(-1))(-1) -pT (root Hz)(-1) for a condensate of 10(4) atoms with coherence times on the order of several ms under state-of-the-art experimental parameters.
NEW JOURNAL OF PHYSICS
(2021)
Article
Chemistry, Physical
Thais R. Scott, Meagan S. Oakley, Matthew R. Hermes, Andrew M. Sand, Roland Lindh, Donald G. Truhlar, Laura Gagliardi
Summary: Density fitting reduces computational cost by avoiding computation and manipulation of four-index electron repulsion integrals, allowing efficient optimization of large systems. The new approach increases computation speed with negligible loss in accuracy, while smaller grid sizes further reduce costs with minimal impact on optimized geometries and gradient values.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Optics
Hui Tang, Peng Du, Lei Jing, Su Yi, Wenxian Zhang
Summary: Generating a spin vortex in a Rb-87 dipolar spinor Bose-Einstein condensate in a controllable way is still challenging. This paper proposes an experimentally easy and tunable method to produce a spin vortex by varying the potential barrier height and the width of an additionally applied optical plug. The results predict a coreless spin vortex, different from the conventional polar core vortex.
Article
Physics, Multidisciplinary
Li Tian, Ningxuan Zheng, Jun Jian, Wenliang Liu, Jizhou Wu, Yuqing Li, Yongming Fu, Peng Li, Vladimir Sovkov, Jie Ma, Liantuan Xiao, Suotang Jia
Summary: We conducted a research on spin currents in a Na-23 spinor Bose-Einstein condensate (BEC) by applying a magnetic field gradient. The spin current was successfully induced by the spin-dependent force generated by the magnetic field gradient. We studied the dynamics of the spin components under the influence of the magnetic force. This study holds promise for generating longer spin coherence and enhancing the sensitivity of spin-mixing interferometry in a spinor BEC.
Article
Chemistry, Multidisciplinary
Kai Zhang, Marie-Christine Hanf, Romain Bernard, Yves Borensztein, Hervei Cruguel, Andrea Resta, Yves Garreau, Alina Vlad, Alessandro Coati, Davide Sciacca, Bruno Grandidier, Mickael Derivaz, Carmelo Pirri, Philippe Sonnet, Reigis Stephan, Geoffroy Prevot
Summary: Through scanning tunneling microscopy (STM), surface X-ray diffraction (SXRD), and density functional theory, we have revealed a Ge-induced (root 109 x root 109)R +/- 24.5 degrees reconstruction on Ag(111). We have demonstrated the possibility of solving a giant surface reconstruction using SXRD and STM. The reconstructed structure consists of Ge pentagons, hexagons, and heptagons, with the inclusion of a few dispersed Ag atoms.
Article
Physics, Multidisciplinary
Chunyu Jia, Rukuan Wu, Ying Hu, Wu-Ming Liu, Zhaoxin Liang
Summary: The magnetic soliton is a topological excitation that can appear in a non-equilibrium framework, even with strong spin anisotropic interactions. This unconventional soliton formation may be due to a dissipation-enabled mechanism, offering new possibilities for applications in opto-spintronics.
FRONTIERS IN PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Luis Leyva-Parra, Ricardo Pino-Rios
Summary: The electronic structure, changes in aromatic behavior, and stability of the least studied m-quinone in the benzoquinone family were investigated. Unrestricted density functional theory calculations and three aromaticity criteria were used to understand why this isomer prefers the triplet state in its ground state. The answer lies in spin density delocalization and proposed resonance structure contributions.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Physics, Multidisciplinary
H-Y Liang, L-Y Qiu, Y-B Yang, H-X Yang, T. Tian, Y. Xu, L-M Duan
Summary: This study observed a new phenomenon where heat exhibits power-law scaling when a system is linearly driven from a polar phase to an antiferromagnetic phase across a first-order quantum phase transition. The heat generated during two non-equilibrium processes was experimentally evaluated and the scaling exponents measured agreed well with numerical simulation results. This work opens up a new avenue for experimentally and theoretically exploring the properties of heat in non-equilibrium dynamics.
NEW JOURNAL OF PHYSICS
(2021)
Article
Multidisciplinary Sciences
Mario H. Figlioli Donato, Sergio R. Muniz
Summary: In this study, an intriguing effect caused by a thin finite barrier in a quasi-one-dimensional toroidal spinor Bose-Einstein condensate (BEC) is explored, revealing a Josephson-like current that can be used to probe the spinor symmetry solely through measurements of the superfluid current.
Article
Optics
Luca Dell'Anna
Summary: We analytically calculate the entanglement properties of free bosons on a lattice in the ground state. Our analysis provides a unified approach based on a reduced density matrix technique to calculate the entanglement and an infinite number of correlation functions.
Article
Astronomy & Astrophysics
Theodoros Soultanis, Andreas Bauswein, Nikolaos Stergioulas
Summary: We propose a new analytic model to describe the gravitational-wave emission in the postmerger phase of binary neutron star mergers. The model takes into account various physical parameters related to oscillation modes, combination tones, and nonlinear features. The time evolution of the main frequency peak is described by a two-segment linear expression. The model shows high effectiveness in fitting the data for a wide range of total binary masses, and identifies new spectral features for high masses.
Article
Multidisciplinary Sciences
Juan Carlos Sandoval-Santana, Roberto Zamora-Zamora, Rosario Paredes, Victor Romero-Rochin
Summary: This study focuses on decoherence and recurrences in the dynamics of the one-body density matrix of an F=1 spinor Bose-Einstein condensate, revealing accurate analytical expressions for the time dependence of coherent states. The research also uncovers the relationship between decoherence and recurrence times with the number of atoms and strength parameters, showing significant differences based on the strength of spin-spin interactions.
Article
Computer Science, Interdisciplinary Applications
Paramjeet Banger, Pardeep Kaur, Sandeep Gautam
Summary: We develop time-splitting finite-difference methods to study spin-orbit-coupled spinor Bose-Einstein condensates with coherent coupling. The split equations involving kinetic energy and spin-orbit-coupling operators are solved using implicit Backward-Euler and semi-implicit Crank-Nicolson methods. The methods are explicitly developed for pseudospin-1/2, spin-1, and spin-2 condensates. Results obtained with these methods are in agreement with popular methods and confirm the emergence of different phases in spin-orbit-coupled condensates.
INTERNATIONAL JOURNAL OF MODERN PHYSICS C
(2022)
Article
Mathematics, Applied
Luis E. Young-S, S. K. Adhikari
Summary: The possibility of generating stable anisotropic solitons in dipolar Bose-Einstein condensates leads to unique collision dynamics where collisions are quasi elastic at high velocities and inelastic at low velocities, resulting in the formation of coalesced solitons in different modes. The investigation was conducted numerically using the mean-field Gross-Pitaevskii equation to study the statics and dynamics of anisotropic bright solitons in quasi two-dimensional BECs with polarized dipolar atoms.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2022)
Article
Mathematics, Applied
Luis E. Young-S, S. K. Adhikari
Summary: This study investigates the effect of beyond-mean-field quantum-fluctuation (QF) Lee-Huang-Yang (LHY) and three-body interactions on the formation of dipolar Bose-Einstein condensate (BEC) droplets. The size, shape, and energy of polarized 164Dy atom dipolar droplets are obtained using numerical and variational approximation methods.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2022)
Article
Computer Science, Interdisciplinary Applications
Paramjeet Banger, Pardeep Kaur, Arko Roy, Sandeep Gautam
Summary: This article provides updated versions of FORTRAN 90/95 programs parallelized with OpenMP for numerically studying the ground states and/or dynamics of homogeneous or trapped spin-1 or spin-2 Bose-Einstein condensates (BECs) with anisotropic spin-orbit (SO) coupling. The coupled sets of three or five Gross-Pitaevskii (GP) equations for spin-1 or spin-2 BEC are solved using a time-splitting Fourier spectral method.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Luis E. Young-S, S. K. Adhikari
Summary: In this paper, a model is used to demonstrate the crystallization of droplets in a polarized dipolar condensate in a three-dimensional trap. The droplet lattice is formed in a clean and distortion-free manner in the box traps, allowing for experimental observation of the droplet lattice with a reduced number of atoms compared to a harmonic trap.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Computer Science, Interdisciplinary Applications
Luis E. Young-S, Paulsamy Muruganandam, Antun Balaz, Sadhan K. Adhikari
Summary: In this paper, we present OpenMP Fortran 90/95 versions of numerical programs for solving the dipolar Gross-Pitaevskii equation. These programs have significantly reduced execution time on multicore processors.
COMPUTER PHYSICS COMMUNICATIONS
(2023)
Article
Physics, Condensed Matter
Paramjeet Banger, R. Kishor Kumar, Arko Roy, Sandeep Gautam
Summary: We systematically analyze the stationary-state vortex lattice configurations of rotating spin-orbit (SO)- and coherently-coupled spin-1 Bose-Einstein condensates (BECs) trapped in quasi-two-dimensional harmonic potentials from the single-particle perspective. We find that under specific coupling and rotation strengths, bosons in these condensates experience effective toroidal, symmetric double-well, or asymmetric double-well potentials. On rapid rotation, we further discover a similarity in the response between antiferromagnetic spin-1 BECs and ferromagnetic SO-coupled condensates, indicated by the spin-expectation per particle approaching unity.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Physics, Multidisciplinary
Pardeep Kaur, Sandeep Gautam, S. K. Adhikari
Summary: We demonstrate the spontaneous generation of spatially-periodic supersolid-like super-lattice and stripe solitons in Rashba spin-orbit coupled spin-1 and spin-2 quasi-two-dimensional nonmagnetic Bose-Einstein condensates. The solitons in a weakly spin-orbit coupled spin-1 condensate are circularly-symmetric with inherent vorticity, while the solitons in an spin-orbit coupled spin-2 condensate have multiple types of circularly-symmetric shapes and can acquire a multiring structure with stronger coupling strengths. Additionally, quasi-degenerate stripe and super-lattice solitons emerge as excited stationary states for stronger spin-orbit coupling strengths.
Article
Optics
Luis E. Young-S., S. K. Adhikari
Summary: We study dipole-mode and scissors-mode oscillations of a dipolar supersolid arranged on a 1D or 2D lattice to test the stability of its crystalline structure under translation and rotation. Both quasi-1D and quasi-2D dipolar supersolids exhibit stable dipole-mode oscillations, while sustained angular scissors-mode oscillations are observed only in quasi-1D dipolar supersolids within a specific trap anisotropy range. The crystalline structure of the dipolar supersolid remains unaffected during the oscillations. The theoretical predictions of the oscillation frequency agree well with experimental results, with better agreement seen at higher droplet numbers and trap frequencies.
Article
Mathematics, Applied
Luis E. Young-S, S. K. Adhikari
Summary: We demonstrate the formation of mini droplets, mega droplets, and stripe patterns in a dipolar 164Dy condensate using an improved mean-field model. The study shows the formation of mini droplets for small atom numbers, and the formation of mega droplets containing a large number of atoms along with a stripe pattern as the atom number increases.
PHYSICA D-NONLINEAR PHENOMENA
(2023)
Article
Optics
Rajat, Arko Roy, Sandeep Gautam
Summary: We theoretically investigate the collective excitations of a spin-orbit-coupled spin-1 Bose-Einstein condensate with antiferromagnetic spin-exchange interactions. We analyze the behavior of density and spin excitations at zero and finite temperatures using the Hartree-Fock-Bogoliubov theory. The results show that the presence of spin-orbit coupling breaks the degeneracy between a pair of spin modes.
Article
Optics
Luis E. Young-S, S. K. Adhikari
Summary: We observe the crystallization of droplets in square and honeycomb lattice structures in a quasi-two-dimensional trapped dipolar condensate. These three types of crystallization can occur under the same atomic interaction and trap frequencies. The energy of all three crystallizations follows a scaling relation with the number of atoms, indicating their energetic plausibility. The square lattice crystallization with an occupied central site is a potential candidate for future experimental observation.
Article
Optics
Pardeep Kaur, Sandeep Gautam, S. K. Adhikari
Summary: We studied the emergence of supersolid-like crystalline structures in a quasi-two-dimensional spin-orbit coupled spin-2 condensate. Different strengths of spin-orbit coupling and interatomic interactions led to a variety of nontrivial density patterns in the solutions.
