Effective potential approach to quantum dissipation in condensed matter systems
Alessandro Cuccoli, Andrea Fubini, Valerio Tognetti, Ruggero Vaia
Abstract
The effects of dissipation on the thermodynamic properties of nonlinear quantum systems are approached by the path-integral method in order to construct approximate classical-like formulas for evaluating thermal averages of thermodynamic quantities. Explicit calculations are presented for one-particle and many-body systems. The effects of the dissipation mechanism on the phase diagram of two-dimensional Josephson arrays is discussed.
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