Solitary Waves in Immiscible Two-component Bose-Einstein Condensates
Author : Chen Yun Yin
Publisher :
Page : 304 pages
File Size : 41,74 MB
Release : 2009
Category : Bose-Einstein condensation
ISBN :
Author : Chen Yun Yin
Publisher :
Page : 304 pages
File Size : 41,74 MB
Release : 2009
Category : Bose-Einstein condensation
ISBN :
Author : Carlos Bravo Prieto
Publisher :
Page : pages
File Size : 29,27 MB
Release : 2017
Category :
ISBN :
We investigate the dynamical properties of 1D solitary waves in confined immiscible mixtures of Bose-Einstein condensates with repulsive interparticle interactions. We perform numerical simulations of the coupled Gross-Pitaevskii equations for two-components harmonically trapped in presence of dark and grey solitons, and we study the reflection and transmission of this matter wave after the collision with the interphase between the two immiscible species. Our numerical results show different scenarios depending on the ratio between the interspecies and intraspecies strength interactions, where the immiscibility plays an important role in the dynamical behaviour of the matter wave.
Author : Panayotis G. Kevrekidis
Publisher : Springer Science & Business Media
Page : 398 pages
File Size : 19,13 MB
Release : 2007-12-29
Category : Science
ISBN : 3540735917
This book, written by experts in the fields of atomic physics and nonlinear science, covers the important developments in a special aspect of Bose-Einstein condensation, namely nonlinear phenomena in condensates. Topics covered include bright, dark, gap and multidimensional solitons; vortices; vortex lattices; optical lattices; multicomponent condensates; mathematical methods/rigorous results; and the beyond-the-mean-field approach.
Author : Thomas Paul Billam
Publisher :
Page : pages
File Size : 31,50 MB
Release : 2012
Category : Bose-Einstein condensation
ISBN :
In this thesis we investigate the static properties and non-equilibrium dynamics of bright solitary waves in atomic Bose-Einstein condensates in the zero-temperature limit, and we investigate the non-equilibrium dynamics of a driven atomic Bose-Einstein condensate at finite temperature. Bright solitary waves in atomic Bose-Einstein condensates are non-dispersive and soliton-like matter-waves which could be used in future atom-interferometry experiments. Using the mean-field, Gross-Pitaevskii description, we propose an experimental scheme to generate pairs of bright solitary waves with controlled velocity and relative phase; this scheme could form an important part of a future atom interferometer, and we demonstrate that it can also be used to test the validity of the mean-field model of bright solitary waves. We also develop a method to quantitatively assess how soliton-like static, three-dimensional bright solitary waves are; this assessment is particularly relevant for the design of future experiments. In reality, the non-zero temperatures and highly non-equilibrium dynamics occurring in a bright solitary wave interferometer are likely to necessitate a theoretical description which explicitly accounts for the non-condensate fraction. We show that a second-order, number-conserving description offers a minimal self-consistent treatment of the relevant condensate -- non-condensate interactions at low temperatures and for moderate non-condensate fractions. We develop a method to obtain a fully-dynamical numerical solution to the integro-differential equations of motion of this description, and solve these equations for a driven, quasi-one-dimensional test system. We show that rapid non-condensate growth predicted by lower-order descriptions, and associated with linear dynamical instabilities, can be damped by the self-consistent treatment of interactions included in the second-order description.
Author : C. J. Pethick
Publisher : Cambridge University Press
Page : 538 pages
File Size : 23,5 MB
Release : 2008-09-11
Category : Science
ISBN : 1139811088
Since an atomic Bose-Einstein condensate, predicted by Einstein in 1925, was first produced in the laboratory in 1995, the study of ultracold Bose and Fermi gases has become one of the most active areas in contemporary physics. This book explains phenomena in ultracold gases from basic principles, without assuming a detailed knowledge of atomic, condensed matter, and nuclear physics. This new edition has been revised and updated, and includes new chapters on optical lattices, low dimensions, and strongly-interacting Fermi systems. This book provides a unified introduction to the physics of ultracold atomic Bose and Fermi gases for advanced undergraduate and graduate students, as well as experimentalists and theorists. Chapters cover the statistical physics of trapped gases, atomic properties, cooling and trapping atoms, interatomic interactions, structure of trapped condensates, collective modes, rotating condensates, superfluidity, interference phenomena, and trapped Fermi gases. Problems are included at the end of each chapter.
Author : P. Öhberg
Publisher :
Page : 8 pages
File Size : 50,49 MB
Release : 2007
Category :
ISBN :
Author : Keith Burnett (Ed); Mark Edwar
Publisher : DIANE Publishing
Page : 213 pages
File Size : 46,59 MB
Release : 1996-12
Category :
ISBN : 0788137409
Among the most remarkable effects that quantum mechanics adds to the catalog of the thermal properties of matter is "condensation" of an ideal gas of identical particles into a single quantum state, the principle of which was discovered in the theory of statistical mechanics by Bose and Einstein in the 1920s. Bose-Einstein condensation (BEC) is a mechanism for producing a macroscopic quantum system, and is exemplary of the macroscopic quantum phenomena of superconductivity and superfluidity.These 15 papers provide an introduction to current work on BEC.
Author :
Publisher :
Page : 3 pages
File Size : 22,75 MB
Release : 2015
Category :
ISBN :
Author :
Publisher :
Page : pages
File Size : 25,56 MB
Release : 2016
Category :
ISBN :
Abstract: The ground states of two-component miscible Bose–Einstein condensates (BECs) confined in a rotating annular trap are obtained by using the Thomas–Fermi (TF) approximation method. The ground state density distribution of the condensates experiences a transition from a disc shape to an annulus shape either when the angular frequency increases and the width and the center height of the trap are fixed, or when the width and the center height of the trap increase and the angular frequency is fixed. Meantime the numerical solutions of the ground states of the trapped two-component miscible BECs with the same condition are obtained by using imaginary-time propagation method. They are in good agreement with the solutions obtained by the TF approximation method. The ground states of the trapped two-component immiscible BECs are also given by using the imaginary-time propagation method. Furthermore, by introducing a normalized complex-valued spinor, three kinds of pseudospin textures of the BECs, i.e., giant skyrmion, coaxial double-annulus skyrmion, and coaxial three-annulus skyrmion, are found.
Author : Masahito Ueda
Publisher : World Scientific Publishing Company
Page : 368 pages
File Size : 26,43 MB
Release : 2010-07-29
Category : Science
ISBN : 9813107448
This book covers the fundamentals of and new developments in gaseous Bose-Einstein condensation. It begins with a review of fundamental concepts and theorems, and introduces basic theories describing Bose-Einstein condensation (BEC). It then discusses some recent topics such as fast-rotating BEC, spinor and dipolar BEC, low-dimensional BEC, balanced and imbalanced fermionic superfluidity including BCS-BEC crossover and unitary gas, and p-wave superfluidity.