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SUMMARY:CM Seminar: Michael Zaletel – University of California Berkley: Anomalous Hall Crystals in Graphene: interaction-driven Chern bands at zero magnetic field
DESCRIPTION:Michael Zaletel – University of California Berkley\nTitle: Anomalous Hall Crystals in Graphene: interaction-driven Chern bands at zero magnetic field \nAbstract: Recent experiments have discovered that pentalayer-graphene subject to a moire superlattice spontaneously breaks time-reversal\, resulting in a quantized anomalous Hall effect at zero magnetic field. At fractional filling\, the material exhibits a zero-field fractional quantum Hall effect. In contrast to other moire-materials\, the origin of Chern bands in this material is not so clear. I will present a theoretical picture in which Chern bands arise from an “anomalous Hall crystal” stabilized primarily by interactions.  So far this picture is supported mainly by mean-field calculations\, so I’ll conclude with some open questions about how the Hall crystal could be verified.   \nSpeaker Bio: Michael Zaletel is an Associate Professor of Physics and the\nAllison and Thomas Schneider Chair at UC Berkley.
URL:https://qmi.miffanytark.com/event/cm-seminar-michael-zaletel-university-of-california-berkley-anomalous-hall-crystals-in-graphene-interaction-driven-chern-bands-at-zero-magnetic-field/
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
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