Environment-dependent dissipation in quantum Brownian motion
| Autor: | Jyrki Piilo, Kalle-Antti Suominen, Janika Paavola, Sabrina Maniscalco |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Physics
Quantum Physics Quantum decoherence Time evolution FOS: Physical sciences Quantum entanglement Dissipation 01 natural sciences Atomic and Molecular Physics and Optics 010305 fluids & plasmas Thermalisation Classical mechanics 0103 physical sciences Statistical physics 010306 general physics Quantum Physics (quant-ph) Quantum Brownian motion Harmonic oscillator |
| Popis: | 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. 10 pages, 6 figures, v2: added new references and paragraphs |
| Databáze: | OpenAIRE |
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