Wednesday, July 4, 2012

1207.0061 (Wen-ge Wang)

Statistical description of small quantum systems beyond weak-coupling
limit
   [PDF]

Wen-ge Wang
An explicit expression is derived for the statistical description of small quantum systems, which are relatively-weakly and directly coupled to only small parts of their environments. The derived expression has a canonical form, but is given by a renormalized self-Hamiltonian of the studied system, which appropriately takes into account the influence of the system-environment interaction. In the case that the system has a narrow spectrum and the environment is sufficiently large, the modification to the self-Hamiltonian usually has a mean-field feature, given by an environmental average of the interaction Hamiltonian. In other cases, the modification may be beyond the mean-field approximation.
View original: http://arxiv.org/abs/1207.0061

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