Nonequilibrium Kubo Formula of Finite Conductor Connected to Reservoirs based on Keldysh Formalism(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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We show that the density matrix for a finite conductor attached to reservoirs obtained by Keldysh formalism is of MacLennan-Zubarev form. On the basis of the fact that the density matrix is the invariant part proposed by Zubarev, it is shown that Keldysh formalism may describe the irreversible processes and steady-state feature of the system. An important consequence of the MacLennan-Zubarev form of the density matrix is a generalization of the Kubo formula in a nonequilibrium case. On the basis of the result, we propose a nonequilibrium identity between differential conductance, noise power and shot noise as a generalized Nyquist-Johnson relation.
- 社団法人日本物理学会の論文
- 2007-04-15
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