Environment-dependent dissipation in quantum Brownian motion

Details Environment-dependent dissipation in quantum Brownian motion Environment-dependent dissipation in quantum Brownian motion

2009-02-17

arxiv.org/abs/0902.2813v2

Phys. Rev. A 79, 052120 (2009)

Physics

Quantum Physics

10 pages, 6 figures, v2: added new references and paragraphs

Scientific paper

10.1103/PhysRevA.79.052120

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 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.

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