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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Moriya R,Kinoshita K,Crosse JA,Watanabe K,Taniguchi T,Masubuchi S,Moon P,Koshino M,Machida Tdoi
10.1038/s41467-020-19043-xsubject
Has Abstractpub_date
2020-10-23 00:00:00pages
5380issue
1issn
2041-1723pii
10.1038/s41467-020-19043-xjournal_volume
11pub_type
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