Non-equilibrium Dynamics of Tunnel-Coupled Superfluids

Relaxation to a Phase-Locked Equilibrium State in a One-Dimensional Bosonic Josephson Junction...

Marine Pigneur

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English

Springer Nature Switzerland AG
29 August 2021

Low temperature physics; Quantum physics (quantum mechanics & quantum field theory)

Series: Springer Theses

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.

By: Marine Pigneur
Imprint: Springer Nature Switzerland AG
Country of Publication: Switzerland
Edition: 2020 ed.
Dimensions: Height: 235mm, Width: 155mm,
Weight: 326g
ISBN: 9783030528461
ISBN 10: 3030528464
Series: Springer Theses
Pages: 187
Publication Date: 29 August 2021
Audience: Professional and scholarly , Undergraduate
Format: Paperback
Publisher's Status: Active

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.