Geometrical Responses of Generalized Landau Levels: Structure Factor and the Quantized Hall Viscosity

TL;DR

This paper introduces a geometric framework for generalized Landau levels with non-uniform Berry curvature, revealing their structure, harmonic map properties, and quantized Hall viscosity, thus broadening the understanding of quantum Hall systems.

Contribution

It provides a novel geometric characterization of GLLs using holomorphic curves and harmonic maps, and demonstrates their quantized Hall viscosity, extending Landau level theory.

Findings

GLLs are harmonic maps from the Brillouin zone to complex projective space.

Filled GLLs exhibit quantized Hall viscosity.

GLLs are critical points of the Dirichlet energy functional.

Abstract

We present a new geometric characterization of generalized Landau levels (GLLs). The GLLs are a generalization of Landau levels to non-uniform Berry curvature, and are mathematically defined in terms of a holomorphic curve -- an ideal K\"ahler band -- and its associated unitary Frenet-Serret moving frame. Here, we find that GLLs are harmonic maps from the Brillouin zone to the complex projective space and they are critical points of the Dirichlet energy functional, as well as the static structure factor up to fourth order. We also find that filled GLLs exhibit quantized Hall viscosity, similar to the ordinary Landau levels. These results establish GLLs as a versatile generalization of Landau levels.