Universität zu Köln

Larson, Jonas (2014). Interaction-induced Landau-Zener transitions. EPL, 107 (3). MULHOUSE: EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY. ISSN 1286-4854

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Abstract

By considering a quantum-critical Lipkin-Meshkov-Glick model we analyze a new type of Landau-Zener transitions where the population transfer is mediated by interaction rather than from a direct diabatic coupling. For this scenario, at a mean-field level the dynamics is greatly influenced by quantum interferences. In particular, regardless of how slow the Landau-Zener sweep is, for certain parameters almost no population transfer occurs, which is in stark contrast to the regular Landau-Zener model. For moderate system sizes, this counterintuitive mean-field behaviour is not duplicated in the quantum case. This can be attributed to quantum fluctuations and to the fact that multi-level Landau-Zener-Stuckelberg interferences have a dephasing effect on the above-mentioned phenomenon. We also find a discrepancy between the quantum and mean-field models in terms of how the transfer probabilities scale with the sweep velocity. Copyright (C) EPLA, 2014

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Larson, Jonas UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-432512
DOI:	10.1209/0295-5075/107/30007
Journal or Publication Title:	EPL
Volume:	107
Number:	3
Date:	2014
Publisher:	EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
Place of Publication:	MULHOUSE
ISSN:	1286-4854
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language BOW-TIE MODEL Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/43251