Edge Magnetoplasmons in Quantum Hall Line Junction Systems

TL;DR

This paper investigates how edge magnetoplasmon absorption spectra can reveal interaction effects in quantum Hall line junction systems, highlighting the emergence of collective modes due to strong interactions.

Contribution

It introduces a method to probe interactions in quantum Hall line junctions through spectroscopic analysis of edge magnetoplasmons and their polarization.

Findings

Interactions cause distinct collective modes in the system.

Strong interactions isolate modes within subsystems.

Spectroscopy can differentiate interaction strengths.

Abstract

A quantum Hall line junction system consists of a one-dimensional Luttinger liquid (LL) and two chiral channels that allow density waves incident upon and reflected by the LL to be measured separately. We demonstrate that interactions in a quantum Hall line junction system can be probed by studying edge magnetoplasmon absorption spectra and their polarization dependences. Strong interactions in the junction lead to collective modes that are isolated in either Luttinger liquid or contact subsystems.