High Energy Theory Seminar
Lauritsen 469
Origin of magic angles in Twisted Bilayer Graphene
Grigory Tarnopolsky,
Harvard University,
Graphene is a special two-dimensional material which may provide a condensed-matter analog of 2+1 dimensional electrodynamics. Two layers of graphene placed on top of each other with a small twist angle give an analog of 2+1 non-abelian theory. Spectrum of the Dirac operator in this background non-abelian gauge field reveals a remarkable phenomenon of acquiring infinite number of zero-modes at special values of coupling charge - "magic" angles.
In this talk I'll try to explain the mechanism of this phenomenon and argue that there should be some deep mathematical structure behind it.
For more information, please contact Carol Silberstein by phone at 6685 or by email at [email protected] or visit http://www.theory.caltech.edu/people/seminar/schedule.html.