Non-equilibrium dynamics of tunnel-coupled superfluids : relaxation to a phase-locked equilibrium state in a one-dimensional Bosonic Josephson Junction / Marine Pigneur.
Pigneur, Marine, author.
2020
TK7872.S8
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Title Non-equilibrium dynamics of tunnel-coupled superfluids : relaxation to a phase-locked equilibrium state in a one-dimensional Bosonic Josephson Junction / Marine Pigneur.
Author Pigneur, Marine, author.
ISBN 9783030528447 (electronic book)
3030528448 (electronic book)
9783030528430
DOI https://doi.org/10.1007/978-3-030-52844-7
Published Cham, Switzerland : Springer, [2020]
Language English
Description 1 online resource (xx, 187 pages) : illustrations.
Item Number 10.1007/978-3-030-52844-7 doi
10.1007/978-3-030-52
Call Number TK7872.S8
Dewey Decimal Classification 530.12
Summary The relaxation of isolated quantum many-body systems is a major unsolved problem of modern physics, which is connected to many fundamental questions. However, realizations of quantum many-body systems which are both well isolated from their environment and accessible to experimental study are scarce. In recent years, the field has experienced rapid progress, partly attributed to ultra-cold atoms. This book presents the experimental study of a relaxation phenomenon occurring in a one-dimensional Bosonic Josephson Junction. The system consists of two 1D quasi Bose-Einstein condensates of 87Rb, magnetically trapped on an atom chip. Using radio-frequency dressing, the author deforms a single harmonic trap, in which the atoms are initially condensed, into a double-well potential and realizes a splitting of the wave function. A large spatial separation and a tilt of the double-well enable the preparation of a broad variety of initial states by precisely adjusting the initial population and relative phase of the two wave packets, while preserving the phase coherence. By re-coupling the two wave packets, the author investigates tunneling regimes such as Josephson (plasma) oscillations and macroscopic quantum self-trapping. In both regimes, the tunneling dynamics exhibits a relaxation to a phase-locked equilibrium state contradicting theoretical predictions. The experimental results are supported with an empirical model that allows quantitative discussions according to various experimental parameters. These results illustrate how strongly the non-equilibrium dynamics differ from the equilibrium one, which is well described by thermodynamics and statistical physics.
Note Doctoral thesis accepted by Atominstitut TU Wien, Vienna Austria."
Bibliography, etc. Note Includes bibliographical references.
Access Note Access limited to authorized users.
Series Springer theses. 2190-5061
Available in Other Form Non-Equilibrium Dynamics of Tunnel-Coupled Superfluids : Relaxation to a Phase-Locked Equilibrium State in a One-Dimensional Bosonic Josephson Junction
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Introduction
Theoretical Framework
Experimental Setup and Measurement of the Observables
Relaxation of the Josephson Oscillations in a 1D-BJJ
Transition to a Relaxation-Free Regime
Outlook: Consequence of a Relaxation on the Splitting of a 1D Bose Gas.

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