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Nondissipative Drag Conductance as a Topological Quantum Number

Kun Yang, A. H. MacDonald

cond-mat.mes-hallarXiv:cond-mat/9904061

Abstract

We show in this paper that the boundary condition averaged nondissipative drag conductance of two coupled mesoscopic rings with no tunneling, evaluated in a particular many-particle eigenstate, is a topological invariant characterized by a Chern integer. Physical implications of this observation are discussed.

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