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APCTP-Nankai Joint Symposium on Lattice Statistics and Mathematical Physics

THE CHERN-SIMONS INVARIANT IN THE BERRY PHASE OF A TWO BY TWO HAMILTONIAN

Dung‐Hai Lee

Published Nov 1, 2002• 0 citations
Publisher
DOI
10.1142/9789812776358_0007

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We prove, working in the Hamiltonian formalism, that a U(1) Chern-Simons theory coupled to fermions on a lattice can be mapped exactly onto a theory of interacting lattice anyons. This map does not involve any singular gauge transformations, and is everywhere well defined. We also prove that, when the statistics parameter is an odd integer so that the anyons are bosons, the ground state, which consists of a condensate of bound pairs of flux tubes and fermions, breaks phase invariance. The ensuing long range order implies that the system is an unconventional superfluid.