CMT Seminar - Michael Zaletel, Station Q, Microsoft Research - Monday, August 29th - 11:30am, 1080 Smith Seminar Room PRB

[Robbins, Eric]

Please join us for a Special CMT Seminar presented by Mike Zaletel, Station Q, Microsoft Research on Monday, Monday, August 29th at 11:30am in 1080 Smith Seminar Room

" The half-filled Landau level: the case for Dirac composite fermions "

Abstract: In a two-dimensional electron gas under a strong magnetic field, correlations generate emergent excitations fundamentally distinct from electrons. Halperin, Lee and Read predicted that "composite fermions"-bound states of an electron with two magnetic flux quanta-can experience zero net magnetic field and form a Fermi sea. I'll present evidence from infinite-cylinder DMRG which further verifies the existence of this exotic Fermi sea, but found a twist: the phase is particle-hole symmetric. Following a recent conjecture of D Son, we find our results are only consistent if composite fermions are actually massless Dirac particles, similar to the surface of a topological insulator. Exploiting this analogy we observe the suppression of $2 k_F$ backscattering characteristic of Dirac particles. Thus the remarkable phenomenology of Dirac fermions is relevant also to two-dimensional electron gasses in the quantum Hall regime.
Thank you,
Eric
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