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The dc conductance Γ of a finite system with static disorder is related to its transmission matrix t by the simple relation Γ=(e²2π) Tr(t^t). This relation is derived from the Kubo formula and is valid for any number of scattering channels with or without time-reversal symmetry. Differences between various definitions of the conductance of a finite system are discussed.
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Fisher et al. (1981) studied this question.
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