Thermal and Tunneling Pair Creation of Quasiparticles in Quantum Hall Systems

TL;DR

This paper presents a semiclassical analysis of quasiparticle pair creation in quantum Hall systems, highlighting the effects of impurities and tunneling at low temperatures and strong magnetic fields, with excellent experimental data fit.

Contribution

It introduces a semiclassical approach to analyze thermal and tunneling pair creation of quasiparticles, emphasizing impurity effects on gap energy reduction.

Findings

Impurities significantly reduce the quasiparticle gap energy.

Tunneling becomes dominant at low temperatures and high magnetic fields.

The semiclassical model fits experimental data well.

Abstract

We make a semiclassical analysis of thermal pair creations of quasiparticles at various filling factors in quantum Hall systems. It is argued that the gap energy is reduced considerably by the Coulomb potential made by impurities. It is also shown that a tunneling process becomes important at low temperature and at strong magnetic field. We fit typical experimental data excellently based on our semiclassical results of the gap energy.