Emergence of orbital angular moment at van Hove singularity in graphene/h-BN moiré superlattice

Rai Moriya (), Kei Kinoshita, J. A. Crosse, Kenji Watanabe, Takashi Taniguchi, Satoru Masubuchi, Pilkyung Moon, Mikito Koshino and Tomoki Machida ()
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Rai Moriya: University of Tokyo
Kei Kinoshita: University of Tokyo
J. A. Crosse: New York University Shanghai and NYU-ECNU Institute of Physics at NYU Shanghai
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: University of Tokyo
Satoru Masubuchi: University of Tokyo
Pilkyung Moon: New York University Shanghai and NYU-ECNU Institute of Physics at NYU Shanghai
Mikito Koshino: Osaka University
Tomoki Machida: University of Tokyo

Nature Communications, 2020, vol. 11, issue 1, 1-6

Abstract: Abstract Bloch electrons lacking inversion symmetry exhibit orbital magnetic moments owing to the rotation around their center of mass; this moment induces a valley splitting in a magnetic field. For the graphene/h-BN moiré superlattice, inversion symmetry is broken by the h-BN. The superlattice potential generates a series of Dirac points (DPs) and van Hove singularities (vHSs) within an experimentally accessible low energy state, providing a platform to study orbital moments with respect to band structure. In this work, theoretical calculations and magnetothermoelectric measurements are combined to reveal the emergence of an orbital magnetic moment at vHSs in graphene/h-BN moiré superlattices. The thermoelectric signal for the vHS at the low energy side of the hole-side secondary DP exhibited significant magnetic field-induced valley splitting with an effective g-factor of approximately 130; splitting for other vHSs was negligible. This was attributed to the emergence of an orbital magnetic moment at the second vHS at the hole-side.

Date: 2020
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DOI: 10.1038/s41467-020-19043-x

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