Measurement of the {\nu}= 1/3 fractional quantum Hall energy gap in suspended graphene

TL;DR

This paper reports on the measurement of the energy gap of the 1/3 fractional quantum Hall state in suspended graphene, revealing a gap of approximately 20 K at 14 T through magnetotransport experiments.

Contribution

The study provides the first direct measurement of the energy gap for the 1/3 fractional quantum Hall state in suspended graphene.

Findings

Integer quantum Hall states observed at low magnetic fields

Fractional quantum Hall states, especially at ν=1/3, are clearly identified

Energy gap for ν=1/3 state is approximately 20 K at 14 T

Abstract

We report on magnetotransport measurements of multi-terminal suspended graphene devices. Fully developed integer quantum Hall states appear in magnetic fields as low as 2 T. At higher fields the formation of longitudinal resistance minima and transverse resistance plateaus are seen corresponding to fractional quantum Hall states, most strongly for {\nu}= 1/3. By measuring the temperature dependence of these resistance minima, the energy gap for the 1/3 fractional state in graphene is determined to be at ~20 K at 14 T.