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Prog. Theor. Phys. Vol. 116 No. 1 (2006) pp. 61-86

[ Full Text PDF : FREE ACCESS (285K) ]

Theory of Non-Equilibirum States Driven by Constant Electromagnetic Fields

— Non-Commutative Quantum Mechanics in the Keldysh Formalism —

Shigeki Onoda,1,* Naoyuki Sugimoto2 and Naoto Nagaosa3,4

1Spin Superstructure Project, ERATO, Japan Science and Technology Agency,
c/o Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
2Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
3CREST, Department of Applied Physics, University of Tokyo, Tokyo 113-8656
4Correlated Electron Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8562, Japan

(Received May 14, 2006)

Abstract:

We develop a general theory of non-equilibrium states based on the Keldysh formalism, in particular, for charged-particle systems under static uniform electromagnetic fields. The Dyson equation for the uniform stationary state is rewritten in a compact gauge-invariant form by using the Moyal product in the phase space of energy-momentum variables, whcich originally do not commute in the case of the conventional operator algebra. Expanding the Dyson equation in electromagnetic fields, a systematic method for the order-by-order calculation of linear and non-linear responses from the zeroth-order Green's functions is obtained. In particular, we find that for impurity problems, up to linear order in the electric field, the present approach provides a diagrammatic method for the St\ureda formula. This approach also generalizes the semi-classical Boltzmann transport theory to fully quantum-mechanical and/or multi-component systems. In multi-component systems and/or for Hall transport phenomena, however, this quantum Boltzmann transport theory, constructed from the anti-symmetric combination of two different representations for the Dyson equation, does not uniquely specify the non-equilibrium state, but the symmetric combination is required. We demonstate the formalism to calculate longitudinal and Hall electric conductivities in an isotropic single-band electron system in the clean limit. It is found that the results are fully consistent with those obtained by Mott and Ziman in terms of the semi-classical Boltzmann transport theory.


URL : http://ptp.ipap.jp/link?PTP/116/61/
DOI : 10.1143/PTP.116.61


*E-mail: sonoda@appi.t.u-tokyo.ac.jp

[ Full Text PDF : FREE ACCESS (285K) ] Citation:


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