Universal nonlinear responses of quantum Hall systems with Galilean invariance

Abstract

We study two-dimensional systems with Galilean invariance gapped under magnetic fields. When such quantum Hall systems are coupled with external sources for charge, energy, and momentum currents, they exhibit invariance under the Milne boost as well as under the gauge and general coordinate transformations. We construct the most general effective action consistent with all the symmetries in the derivative expansion, where an electric field is regarded as order of unity so as to allow for nonlinear responses. The resulting action is shown to consist of four terms proportional to the Hall conductivity and viscosity and the energy density and magnetization. We then compute the local currents induced by electromagnetic fields, revealing universal relations among distinct kinds of responses. In particular, we find the Hall conductivity determining the longitudinal conductivity at nonzero frequency and the Hall viscosity contributing to the nonlinear electrothermal conductivity at nonzero wave number.

8 pages, no figure; published version

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