Stability of the 5/2 Fractional Quantum Hall State in a Corbino Disc Sample with In-plane Electric Fields

TL;DR

This study investigates how in-plane electric fields affect the stability of the 5/2 fractional quantum Hall state in a Corbino disc, providing insights into bulk properties and potential state enhancement under weak fields.

Contribution

It experimentally examines the impact of in-plane electric fields on the 5/2 FQH state in Corbino geometry at ultra-low temperatures, testing theoretical predictions.

Findings

Weak electric fields influence the stability of the 5/2 FQH state.

Results support the possibility of Pfaffian state enhancement under weak electric fields.

Provides experimental data on bulk FQH properties in Corbino geometry.

Abstract

Among the various geometries to study the fractional quantum Hall effect in two dimensional electron gas, the Corbino disc owns the advantage to probe the bulk properties directly. In this work we explore the influence of in-plane electric fields on the stability of the 5/2 fractional quantum Hall state realized in Corbino geometry. The effect of weak electric fields is investigated at ultra-low temperatures in order to compare with a theoretical proposal of enhanced Pfaffian state under weak electric fields.