"Floquetengineering topological Dirac bands in an optical lattice"Ian Spielman , NIST and The University of Maryland [Host: Prof. Dima Pesin]
ABSTRACT:
Over the years my group has performed a number of experiments realizing relativistic physics using cold atoms — described by the 1D Dirac Hamiltonian in some degree of approximation. I will begin by reviewing these results in conjunction with those from the whole of the coldatom community. With that backdrop, I describe a spin dependent bipartite Floquet lattice, in which the dispersion relation is linear for all points in the Brillouin zone. The (stroboscopic) Floquet spectrum of our periodicallydriven Hamiltonian features perfect spinmomentum locking, and a linear Dirac dispersion. These bands are protected by a Floquet topological invariant which we directly measure by using quantum state tomography. VIDEO:

Colloquium Friday, December 3, 2021 3:30 PM Physics Building, Room 204 Note special room. Attend virtually via Zoom:https://web.phys.virginia.edu/Private/Covid19/colloquium.asp 
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