Determination of electric current by the time correlation functions force-force and force-momentum
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A general expression for response of conduction electron system in many particle system, coupled by an external constant electric field, is obtained. Electric field is introduced by a vector potential,Kubo formula for non-equilibrium statistical operator is used and stationary condition is taken explicitly into account. Compared to the usualKubo formula for response, expressions derived here are more convenient for account of interaction between electrons and rest part of many particle system.
KeywordsExternal Electric Field Particle System Dissipative Force Rest Part KUBO Formula
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