Competition between relaxation and external driving in the dissipative Landau-Zener problem

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Erscheinungsjahr:
2010
Medientyp:
Text
Schlagworte:
  • Driven dissipative quantum mechanics
  • Landau-Zener problem
  • Quasiadiabatic propagator path-integral
Beschreibung:
  • We study Landau-Zener transitions in a dissipative environment by means of the quasiadiabatic propagator path-integral scheme. It allows to obtain numerically exact results for the full range of the involved parameters. We discover a non-monotonic dependence of the Landau-Zener transition probability on the sweep velocity which is explained in terms of a simple physical picture. This feature results from a nontrivial competition between relaxation processes and the external sweep and is not captured by perturbative approaches. In addition to the Landau-Zener transition probability, we study the excitation survival probability and also provide a qualitative understanding of the involved competition of time scales. © 2010 Elsevier B.V. All rights reserved.
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  • info:eu-repo/semantics/restrictedAccess
Quellsystem:
Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/3fb58284-b7a0-4552-ba9c-85a3023ea167