Environment-dependent dissipation in quantum Brownian motion

Janika Paavola, Jyrki Piilo, Kalle-Antti Suominen, Sabrina Maniscalco

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34 Citations (Scopus)
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Abstract

The dissipative dynamics of a quantum Brownian particle is studied for different types of environment. We derive analytic results for the time evolution of the mean energy of the system for Ohmic, sub-Ohmic, and super-Ohmic environments, without performing the Markovian approximation. Our results allow one to establish a direct link between the form of the environmental spectrum and the thermalization dynamics. This in turn leads to a natural explanation of the microscopic physical processes ruling the system time evolution both in the short-time non-Markovian region and in the long-time Markovian one. Our comparative study of thermalization for different environments sheds light on the physical contexts in which non-Markovian dissipation effects are dominant.
Original languageEnglish
Article number052120
Number of pages10
JournalPhysical Review A
Volume79
Issue number5
DOIs
Publication statusPublished - 26 May 2009

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