Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2006-05-25
Physics
Condensed Matter
Statistical Mechanics
8 pages and 5 figures
Scientific paper
10.1088/0953-8984/18/44/004
Starting from a quantum Langevin equation (QLE) of a charged particle coupled to a heat bath in the presence of an external magnetic field, we present a fully dynamical calculation of the susceptibility tensor. We further evaluate the position autocorrelation function by using the Gibbs ensemble approach. This quantity is shown to be related to the imaginary part of the dynamical susceptibility, thereby validating the fluctuation-dissipation theorem in the context of dissipative diamagnetism. Finally we present an overview of coherence-to-decoherence transition in the realm of dissipative diamagnetism at zero temperature. The analysis underscores the importance of the details of the relevant physical quantity, as far as coherence to decoherence transition is concerned.
Bandyopadhyay Malay
Dattagupta Sushanta
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