Anisotropic Pseudopotential Characterization of Quantum Hall Systems under Tilted Magnetic Field

TL;DR

This paper analytically characterizes the anisotropic effective interactions in quantum Hall systems under tilted magnetic fields, revealing how sample thickness and magnetic field influence topological states and their stability.

Contribution

It introduces an analytical framework for the anisotropic pseudopotential characterization of quantum Hall systems with tilted magnetic fields, including stability analysis of Laughlin states.

Findings

Anisotropic interactions depend on sample thickness and in-plane magnetic field strength.

Reorientation of Laughlin state anisotropy in the first Landau level.

Analytical computation of the guiding center metric and state stability.

Abstract

We analytically derived the effective two-body interaction for a finite thickness quantum Hall system with a harmonic perpendicular confinement and an in-plane magnetic field. The anisotropic effective interaction in the lowest Landau level (LLL) and first Landau level (1LL) are expanded in the basis of the generalized pseudopotentials (PPs), and we analyze how the coefficients of some prominent isotropic and anisotropic PPs depend on the thickness of the sample and the strength of the in-plane magnetic field. We also investigate the stability of the topological quantum Hall states, especially the Laughlin state and its emergent guiding center metric, which we can now compute analytically. An interesting reorientation of the anisotropy direction of the Laughlin state in the 1LL is revealed, and we also discuss various possible experimental ramifications for this quantum Hall system with broken rotational symmetry.