Article
Computer Science, Interdisciplinary Applications
Rajamanickam Ravisankar, Dusan Vudragovic, Paulsamy Muruganandam, Antun Balaz, Sadhan K. Adhikari
Summary: This paper presents OpenMP versions of FORTRAN programs for solving the Gross-Pitaevskii equation for a harmonically trapped three-component spin-1 spinor Bose-Einstein condensate. The programs include different forms of spin-orbit and Rabi couplings in 1D and 2D spatial dimensions, utilizing split-step Crank-Nicolson discretization for imaginary- and real-time propagation. The programs can calculate stationary states, BEC dynamics, and various physical quantities, with outputs such as wave function, energy, and density profiles.
COMPUTER PHYSICS COMMUNICATIONS
(2021)
Article
Computer Science, Interdisciplinary Applications
Paulsamy Muruganandam, Antun Balaz, Sadhan K. Adhikari
Summary: The program presented here solves the Gross-Pitaevskii equation for a three-component rotating spin-1 BEC in a harmonic trap in two dimensions, with options for different spin-orbit couplings. It uses the split-step Crank-Nicolson scheme for both imaginary and real-time propagation for calculating stationary states and BEC dynamics.
COMPUTER PHYSICS COMMUNICATIONS
(2021)
Article
Physics, Fluids & Plasmas
Yue Jian, Xin Qiao, Jun-Cheng Liang, Zi-Fa Yu, Ai-Xia Zhang, Ju-Kui Xue
Summary: This study investigates the stability and superfluidity of a Bose-Einstein condensate in a two-leg ladder with magnetic field, revealing three phases and a strong dependence on various parameters. The atomic interaction strength plays a significant role in modifying the energy band structure during phase transitions. Furthermore, the study shows that the dynamics and superfluidity of the system can be controlled by adjusting the atomic interaction strength, rung-to-leg coupling ratio, and magnetic flux.
Article
Optics
Sagarika Basak, Han Pu
Summary: The study examines a two-component coupled Bose gas in a 1D optical lattice. The coupling of components leads to changes in spin phases and reveals remarkable spin correlations. The phase transition shifts from first to second order with the introduction of coupling, resulting in the emergence of two spin phases instead of one.
Article
Optics
A. D. Garcia-Orozco, L. Madeira, M. A. Moreno-Armijos, A. R. Fritsch, P. E. S. Tavares, P. C. M. Castilho, A. Cidrim, G. Roati, V. S. Bagnato
Summary: We studied the emergence of universal scaling in the time-evolving momentum distribution of a harmonically trapped three-dimensional Bose-Einstein condensate, which was parametrically driven to a turbulent state. We found that the out-of-equilibrium dynamics post excitation can be described by a single function due to nearby nonthermal fixed points. The observed behavior connects the dynamics of a quantum turbulent state to several far-from-equilibrium phenomena.
Article
Mathematics
Adan J. Serna-Reyes, Jorge E. Macias-Diaz, Nuria Reguera
Summary: This manuscript presents a discrete technique for estimating the solution of a double-fractional two-component Bose-Einstein condensate, using a finite difference methodology for numerical approximation. The existence of numerical solutions is rigorously established, showing consistency in both space and time, stability, and convergence. A MATLAB code for the numerical model is provided for convenience.
Article
Multidisciplinary Sciences
Mengjie Wei, Wouter Verstraelen, Konstantinos Orfanakis, Arvydas Ruseckas, Timothy C. H. Liew, Ifor D. W. Samuel, Graham A. Turnbull, Hamid Ohadi
Summary: The authors demonstrate the on-the-fly reconfigurable optical trapping of organic polariton condensates, which are delocalized over a macroscopic distance from the excitation region. This study holds great potential for future research on polaritonic lattice physics.
NATURE COMMUNICATIONS
(2022)
Review
Physics, Multidisciplinary
Yuli Lyanda-Geller
Summary: This article investigates the dynamics of cold atoms and Bose-Einstein condensate (BEC) systems, and discusses the impact of collision integrals on BEC dynamics. For certain problems, such as condensate nucleation and decay of persistent current, collisions with thermal atoms need to be considered. Additionally, the dynamics of spin-orbit-coupled BEC is also studied.
FRONTIERS IN PHYSICS
(2023)
Article
Physics, Condensed Matter
S. K. Adhikari
Summary: This study investigates supersolid-like states in a quasi-two-dimensional trapped Rashba and Dresselhaus spin-orbit coupled spin-1 condensate. Different types of states are formed depending on the strength of spin-orbit coupling, including superlattice/superstripe states and multi-ring states. These states are found to be dynamically stable and will contribute to a better understanding of crystallization in solids.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Physics, Multidisciplinary
Juan-juan Qi, Dun Zhao, Wu-Ming Liu
Summary: We analytically investigate the effects of spin-orbit coupling (SOC) on soliton collisions in spin-1 Bose-Einstein condensates (BECs). By using the non-standard Hirota's bilinear method, we derive exact soliton solutions for a 1D spin-orbit coupled spin-1 BEC, revealing how SOC can manipulate the dynamics of solitons in spinor BECs. We discuss in detail the soliton collisions of different types under SOC, including ferromagnetic-polar, ferromagnetic-ferromagnetic, and polar-polar collisions. Comparisons between systems with and without SOC show a remarkable phenomenon: SOC can cause the splitting of a soliton.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
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
Physics, Multidisciplinary
Yuanyuan Chen, Hao Lyu, Yong Xu, Yongping Zhang
Summary: This study investigates the elementary excitations of a spin-orbit-coupled spin-1 Bose-Einstein condensate in different phases, and finds that these excitations depend on the spin-orbit coupling parameters.
NEW JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Jingjing Jin, Wei Han, Huifang Zhao, Wenyuan Liu
Summary: This study investigates the Moire superlattice structures generated by the interplay between vortex lattice and optical lattice in two-component Bose-Einstein condensates. The possible superlattice patterns under different twist angles are studied, as well as the relative shift of the Moire superlattices in two components of the condensates.
RESULTS IN PHYSICS
(2022)
Article
Optics
Shaoxiong Li, Uyen Ngoc Le, Hiroki Saito
Summary: Recent studies have found that the use of the Lee-Huang-Yang correction to stabilize self-bound droplets in a single-component Bose-Einstein condensate (BEC) for supersolidity involves high density inside the droplets, which limits the lifetime of the supersolid. This study proposes a two-component mixture of dipolar and nondipolar BECs, such as an 166Er-87Rb mixture, to create and stabilize a supersolid without the need for the LHY correction.
Article
Mathematics, Applied
Ying Wang, Yujie Chen, Jun Dai, Li Zhao, Wen Wen, Wei Wang
Summary: This study investigated the two-dimensional Bose-Einstein condensate with a nonlinear interaction up to quintic order. By deriving the bright soliton solution and analyzing the dynamics of two-dimensional sonic horizon, the periodic formation patterns were quantitatively analyzed and illustrated. The results can provide guidance for observing phenomena related to sonic black holes in a two-dimensional Bose-Einstein condensate with quintic-order nonlinearity.
Article
Physics, Multidisciplinary
A. Farolfi, A. Zenesini, D. Trypogeorgos, C. Mordini, A. Gallemi, A. Roy, A. Recati, G. Lamporesi, G. Ferrari
Summary: The study successfully achieved effects similar to magnetic junctions using a coherently coupled mixture of ultracold bosonic gases, observing the formation of magnetic interfaces and waves. These results establish ultracold gases as a platform for studying far-from-equilibrium spin dynamics in regimes not easily accessible in solid-state systems.
Article
Physics, Multidisciplinary
R. Cominotti, A. Berti, A. Farolfi, A. Zenesini, G. Lamporesi, I. Carusotto, A. Recati, G. Ferrari
Summary: We experimentally measured the dispersion relation of density and spin collective excitation modes in an elongated two-component superfluid of ultracold bosonic atoms. By utilizing a parametric spectroscopic technique based on external modulation of the transverse confinement frequency, we observed the formation of density and spin Faraday waves. Furthermore, we demonstrated that coherent coupling between the two components breaks the phase symmetry and imparts a finite mass to the spin modes.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
S. Bresolin, A. Roy, G. Ferrari, A. Recati, N. Pavloff
Summary: Close to the demixing transition, the degree of freedom associated with relative density fluctuations of a two-component Bose-Einstein condensate is described by a nondissipative Landau-Lifshitz equation. In the quasi-one-dimensional weakly immiscible case, this mapping surprisingly predicts that a dark-bright soliton should oscillate when subject to a constant force favoring separation of the two components. We propose a realistic experimental implementation of this phenomenon which we interpret as a spin -Josephson effect in the presence of a movable barrier.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
V. E. Colussi, F. Caleffi, C. Menotti, A. Recati
Summary: In this study, the physics of a mobile impurity confined in a two-dimensional lattice and interacting with a Bose-Hubbard bath is investigated at zero temperature. By employing the quantum Gutzwiller formalism, a beyond-Frohlich model of the bath-impurity interaction is developed to understand the properties of the polaronic quasiparticle formed by dressing the impurity with quantum fluctuations of the bath. It is found that a stable and well-defined polaron exists in the entire phase diagram of the bath, except for the low tunneling limit of the hard-core superfluid. The properties of the polaron are highly sensitive to different universality classes of the quantum phase transition between the superfluid and Mott insulating phases, serving as a definitive probe of correlations and collective modes in a quantum critical many-body environment.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
R. Cominotti, A. Berti, C. Dulin, C. Rogora, G. Lamporesi, I. Carusotto, A. Recati, A. Zenesini, G. Ferrari
Summary: This study demonstrates a quantum phase transition from a paramagnetic to a ferromagnetic state in an extended atomic superfluid with a coherent coupling between two internal states. The nature of the transition is experimentally assessed using phase diagrams, hysteresis phenomena, magnetic susceptibility, and magnetization fluctuations. The observed features are found to be consistent with mean-field calculations, and experimental protocols are developed to generate domain walls in the ferromagnetic state.
Review
Physics, Applied
Alessio Recati, Sandro Stringari
Summary: Supersolidity is an intriguing state of matter that combines superfluid and crystal features. It has been observed in atomic gases, where density modulations, coherence effects, and new Goldstone modes have been observed. Future research will focus on issues such as the realization of quantized vortices, the role of dimensionality, and the nature of phase transitions.
NATURE REVIEWS PHYSICS
(2023)
Article
Optics
Andrea Richaud, Giacomo Lamporesi, Massimo Capone, Alessio Recati
Summary: Quantum vortices with effective inertial mass, introduced by massive particles in their cores, exhibit new phenomena beyond the standard picture of massless superfluid vortex dynamics. In this study, we propose a scheme to generate controllable and repeatable collisional events between massive vortices. We demonstrate two mass-driven fundamental processes: the annihilation of two counter-rotating vortices and the merging of two co-rotating vortices. This reveals new mechanisms for incompressible-to-compressible kinetic-energy conversion and the stabilization of doubly quantized vortices in flat superfluids.
Article
Optics
Arko Roy, Miki Ota, Franco Dalfovo, Alessio Recati
Summary: This study investigates the fate of a paramagnetic-ferromagnetic quantum phase transition in a two-dimensional coherently coupled Bose mixture of dilute ultracold atomic gases at finite temperature. Numerical simulations using the stochastic Gross-Pitaevskii formalism reveal a finite-temperature critical line for the transition by extracting the average magnetization, magnetic fluctuations, and characteristic relaxation frequency. The critical point shows a linear shift with temperature and the quantities used to probe the transition exhibit temperature power-law scaling. The critical slowing down is well approximated by the square of the spin excitation gap at zero temperature.
Article
Optics
S. M. Roccuzzo, A. Recati, S. Stringari
Summary: We show that by studying the time-dependent response of a trapped gas subjected to a sudden rotation, we can determine the moment of inertia of dipolar supersolid configurations. One-dimensional arrays of droplets provide accurate access to the moment of inertia through the frequency of scissors oscillation, while two-dimensional-like configurations exhibit low-frequency resonances indicating the presence of significant rigid body components in the rotational motion.
Article
Physics, Multidisciplinary
S. M. Roccuzzo, S. Stringari, A. Recati
Summary: We investigate the density distributions of a dipolar Bose-Einstein condensed gas confined in a box potential, focusing on the effects of supersolidity. The ground-state density exhibits a depletion in the bulk region and an accumulation of atoms near the walls due to the competition between attractive and repulsive forces. In a quasi-two-dimensional geometry, we observe a ringlike configuration near the boundary of the box, indicating supersolid and crystal effects. In the case of square box trapping, density oscillations along the edges resemble quasi-one-dimensional configurations. Supersolidity can also be observed in the bulk region for large atom numbers, reflecting the symmetry of the confining potential.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
A. Farolfi, A. Zenesini, R. Cominotti, D. Trypogeorgos, A. Recati, G. Lamporesi, G. Ferrari
Summary: In this study, we experimentally characterized a spatially extended Josephson junction using a coherently coupled two-spin-component Bose-Einstein condensate. The trapped cloud allowed for the freezing of transverse spin excitations. Our results suggest consistency with a simple local density approximation of spin hydrodynamics, the so-called Bose-Josephson junction equations, across different manipulation protocols. Additionally, we identified a method to generate states with a well-defined uniform magnetization.
Article
Optics
D. Petter, A. Patscheider, G. Natale, M. J. Mark, M. A. Baranov, R. van Bijnen, S. M. Roccuzzo, A. Recati, B. Blakie, D. Baillie, L. Chomaz, F. Ferlaino
Summary: The response of a dipolar supersolid to Bragg excitation was studied experimentally and theoretically, revealing that the phase dynamics induced by phase transition significantly affect the response speed. The discrepancy between experiments and theories was attributed to coherent phase variations along the phase diagram.
Article
Physics, Multidisciplinary
Daniele Contessi, Donato Romito, Matteo Rizzi, Alessio Recati
Summary: The study theoretically investigates the Andreev-Bashkin collisionless drag in a one-dimensional Bose-Hubbard model on a ring and calculates the superfluid stiffness matrix using tensor network algorithms. The focus is on the region close to the pair-superfluid phase where the drag can be significant. The importance of drag in determining long-range behavior of correlation functions and the spin speed of sound is highlighted, providing an expression for the spin Luttinger parameter K-S.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Optics
A. Gallemi, S. M. Roccuzzo, S. Stringari, A. Recati
