The experimental observation of quantum Hall effect of l = 3 chiral charge carriers in trilayer graphene

TL;DR

This study provides experimental evidence of l=3 chiral quasiparticles in trilayer graphene, revealing unique quantum Hall effects and cubic dispersion properties through magnetotransport measurements.

Contribution

First experimental observation of l=3 chiral quasiparticles with cubic dispersion in ABC-stacked trilayer graphene, confirming theoretical predictions.

Findings

Observation of Berry's phase 3π in SdHO

Unconventional quantum Hall plateau sequence

Divergent cyclotron mass near charge neutrality

Abstract

Low-energy electronic states in monolayer and bilayer graphenes present chiral charge carriers with unique and unusual properties of interest for electronic applications. Here, we report the magnetotransport measurements in the ABC-stacked trilayer graphene as a function of charge carrier density, magnetic field, and temperature, which show clear evidence of l = 3 chiral quasiparticles with cubic dispersion, existing in a large, 20x60 sq. microns device. Shubnikov-deHaas oscillations (SdHO) reveal the Berry's phase 3\pi, and the marked increase of cyclotron mass near charge neutrality, consistent with divergent behavior expected for l = 3 quasiparticles. We also observe the predicted unconventional sequence of quantum Hall effect (QHE) plateaus, +/-6e^2/h, +/-10e^2/h, ... .