Seminar By Pouyan Ghaemi,City Collage of New York

For Scientists
10/06/2017 3:00 pm - 4:00 pm

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Title: Light induced fractional Hall phases in Graphene

Host: Vladimir Dobrosavljevic

Abstract: In this talk I present a new way to realize two-component fractional quantum Hall phases in monolayer graphene by optically driving the system. A laser is tuned into resonance between two Landau levels, giving rise to an effective tunneling between these two synthetic layers. Remarkably, because of this coupling, the interlayer interaction at non-zero relative angular momentum can become dominant, resembling a hollow-core pseudo-potential. In the weak tunneling regime, this interaction favors the formation of singlet states, as we explicitly show by numerical diagonalization, at filling   = 1=2 and   = 2=3. We discuss possible candidate phases, including the Haldane-Rezayi phase, the interlayer Pfa
ffian phase, and a Fibonacci phase. This demonstrates that our method may pave the way towards the realization of non-Abelian phases, as well as the control of topological phase transitions, in graphene quantum Hall systems using optical fields and integrated photonic structures.

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