Quantization of Hall Conductance For Interacting Electrons on a Torus

Abstract

We consider interacting, charged spins on a torus described by a gapped Hamiltonian with a unique groundstate and conserved local charge. Using quasi-adiabatic evolution of the groundstate around a flux-torus, we prove, without any averaging assumption, that the Hall conductance of the groundstate is quantized in integer multiples of e^2/h, up to exponentially small corrections in the linear size of the system. In addition, we discuss extensions to the fractional quantization case under an additional topological order assumption on the degenerate groundstate subspace.

28 pages, 4 figures, This paper significantly simplifies the proof and tightens the bounds previously shown in arXiv:0911.4706 by the same authors. Updated to reflect published version

References in corpus (3)

• Lieb-Robinson Bounds and the Exponential Clustering Theorem
• Automorphic Equivalence within Gapped Phases of Quantum Lattice Systems
• Lieb-Robinson Bounds for Harmonic and Anharmonic Lattice Systems

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