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Three-dimensional dynamics of a fermionic Mott wedding-cake in clean and disordered optical lattices

Kartsev, Alexey LU ; Karlsson, Daniel LU ; Privitera, A. and Verdozzi, Claudio LU (2013) In Scientific Reports 3.
Abstract
Non-equilibrium quantum phenomena are ubiquitous in nature. Yet, theoretical predictions on the real-time dynamics of many-body quantum systems remain formidably challenging, especially for high dimensions, strong interactions or disordered samples. Here we consider a notable paradigm of strongly correlated Fermi systems, the Mott phase of the Hubbard model, in a setup resembling ultracold-gases experiments. We study the three-dimensional expansion of a cloud into an optical lattice after removing the confining potential. We use time-dependent density-functional theory combined with dynamical mean-field theory, considering interactions below and above the Mott threshold, as well as disorder effects. At strong coupling, we observe multiple... (More)
Non-equilibrium quantum phenomena are ubiquitous in nature. Yet, theoretical predictions on the real-time dynamics of many-body quantum systems remain formidably challenging, especially for high dimensions, strong interactions or disordered samples. Here we consider a notable paradigm of strongly correlated Fermi systems, the Mott phase of the Hubbard model, in a setup resembling ultracold-gases experiments. We study the three-dimensional expansion of a cloud into an optical lattice after removing the confining potential. We use time-dependent density-functional theory combined with dynamical mean-field theory, considering interactions below and above the Mott threshold, as well as disorder effects. At strong coupling, we observe multiple timescales in the melting of the Mott wedding-cake structure, as the Mott plateau persist orders of magnitude longer than the band insulating core. We also show that disorder destabilises the Mott plateau and that, compared to a clean setup, localisation can decrease, creating an interesting dynamic crossover during the expansion. (Less)
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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Scientific Reports
volume
3
article number
2570
publisher
Nature Publishing Group
external identifiers
  • wos:000323813700001
  • scopus:84884216548
  • pmid:23999144
ISSN
2045-2322
DOI
10.1038/srep02570
language
English
LU publication?
yes
id
36a5e0b2-0f15-4ea0-b87b-9d112a0995a6 (old id 4106554)
date added to LUP
2016-04-01 12:57:14
date last changed
2020-08-12 03:33:42
@article{36a5e0b2-0f15-4ea0-b87b-9d112a0995a6,
  abstract     = {Non-equilibrium quantum phenomena are ubiquitous in nature. Yet, theoretical predictions on the real-time dynamics of many-body quantum systems remain formidably challenging, especially for high dimensions, strong interactions or disordered samples. Here we consider a notable paradigm of strongly correlated Fermi systems, the Mott phase of the Hubbard model, in a setup resembling ultracold-gases experiments. We study the three-dimensional expansion of a cloud into an optical lattice after removing the confining potential. We use time-dependent density-functional theory combined with dynamical mean-field theory, considering interactions below and above the Mott threshold, as well as disorder effects. At strong coupling, we observe multiple timescales in the melting of the Mott wedding-cake structure, as the Mott plateau persist orders of magnitude longer than the band insulating core. We also show that disorder destabilises the Mott plateau and that, compared to a clean setup, localisation can decrease, creating an interesting dynamic crossover during the expansion.},
  author       = {Kartsev, Alexey and Karlsson, Daniel and Privitera, A. and Verdozzi, Claudio},
  issn         = {2045-2322},
  language     = {eng},
  publisher    = {Nature Publishing Group},
  series       = {Scientific Reports},
  title        = {Three-dimensional dynamics of a fermionic Mott wedding-cake in clean and disordered optical lattices},
  url          = {http://dx.doi.org/10.1038/srep02570},
  doi          = {10.1038/srep02570},
  volume       = {3},
  year         = {2013},
}