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Nondissipative Drag Conductance as a Topological Quantum Number

Kun Yang, A. H. MacDonald

Published 1999-04-05, updated 2001-01-24Version 2

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.

Comments: 4 pages, no figure. Title modified and significant revision made to the text. Final version appeared in PRB
Journal: Phys. Rev. B 63, 073301 (2001).
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