Quantization of conductance in gapped interacting systems
Abstract
We provide a short proof of the quantisation of the Hall conductance for gapped interacting quantum lattice systems on the two-dimensional torus. This is not new and should be seen as an adaptation of the proof of [1], simplified by making the stronger assumption that the Hamiltonian remains gapped when threading the torus with fluxes. We argue why this assumption is very plausible. The conductance is given by Berry's curvature and our key auxiliary result is that the curvature is asymptotically constant across the torus of fluxes.
Cite
@article{arxiv.1707.06491,
title = {Quantization of conductance in gapped interacting systems},
author = {Sven Bachmann and Alex Bols and Wojciech De Roeck and Martin Fraas},
journal= {arXiv preprint arXiv:1707.06491},
year = {2018}
}
Comments
v1 --> v2: Remark added in Section 3 on the fractional QHE, minor changes for clarification throughout; v2-->v3: In Section 1.3, corrected error in the definition of the flux Hamiltonians; Figure 1 enriched for additional clarity