Optical vorticity from nontrivial Chern numbers enhances electron-impurity skew scattering in topological materials, yielding a ballistic photovoltaic current whose frequency scaling and tensor constraints depend on topological class, defect symmetry, and polarization.
The experimental observation of quantum Hall effect of l = 3 chiral charge carriers in trilayer graphene
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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, ... .
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cond-mat.str-el 1years
2026 1verdicts
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Vortex-enhanced photovoltaic current in disordered topological materials
Optical vorticity from nontrivial Chern numbers enhances electron-impurity skew scattering in topological materials, yielding a ballistic photovoltaic current whose frequency scaling and tensor constraints depend on topological class, defect symmetry, and polarization.