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Many-Body Schrödinger Dynamics of Bose-Einstein Condensates

  • Kaspar Sakmann

Part of the Springer Theses book series (Springer Theses)

Table of contents

About this book

Introduction

At extremely low temperatures, clouds of bosonic atoms form what is known as a Bose-Einstein condensate. Recently, it has become clear that many different types of condensates  -- so called fragmented condensates -- exist. In order to tell whether fragmentation occurs or not, it is necessary to solve the full many-body Schrödinger equation, a task that remained elusive for experimentally relevant conditions for many years. In this thesis the first numerically exact solutions of the time-dependent many-body Schrödinger equation for a bosonic Josephson junction are provided and compared to the approximate Gross-Pitaevskii and Bose-Hubbard theories. It is thereby shown that the dynamics of  Bose-Einstein condensates is far more intricate than one would anticipate based on these approximations. A special conceptual innovation in this thesis are optimal lattice models. It is shown how all quantum lattice models of condensed matter physics that are based on Wannier functions, e.g. the  Bose/Fermi Hubbard model, can be optimized variationally. This leads to exciting new physics.

Keywords

Bosonic Josephson junction Exact solution Schrödinger equation Fragmented condensates Many-body Bose-Einstein condensates Optimal Hubbard model

Authors and affiliations

  • Kaspar Sakmann
    • 1
  1. 1., Theoretical Chemistry GroupInstitute of Physical ChemistryHeidelbergGermany

Bibliographic information

  • DOI https://doi.org/10.1007/978-3-642-22866-7
  • Copyright Information Springer-Verlag Berlin Heidelberg 2011
  • Publisher Name Springer, Berlin, Heidelberg
  • eBook Packages Physics and Astronomy
  • Print ISBN 978-3-642-22865-0
  • Online ISBN 978-3-642-22866-7
  • Buy this book on publisher's site