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Zlatko Papic
Princeton University
"Fractional quantum Hall effect in wide quantum wells at half filling"
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Friday February 01, 2013
3:30pm PHYS 203
Refreshments are served at 3:00 p.m. in Physics room 242.
http://www.princeton.edu/~zpapic/In this talk I will discuss several aspects of fractional quantum Hall physics relevant to the even-denominator states in wide quantum wells.
In these systems, the interactions can be tuned in a complex way by varying the sample thickness, tunnelling between subbands, and density imbalance, such that one can explore transitions between a non-Abelian incompressible state, the multicomponent 331 Halperin state, and the compressible Fermi-liquid-like state.
Furthermore, I will show that in the incompressible phase, the mixing between Landau levels and electronic subbands breaks the particle-hole symmetry in such a way that the ground state at nu=5/2 filling is generically described by the ``anti-Pfaffian" state [1].
The interplay between subbands also leads to an enhancement of the excitation gap of the non-Abelian state, as observed in recent experiments.
[1] Z. Papic, F. D. M. Haldane, E. H. Rezayi, Phys. Rev. Lett. 109, 266806 (2012).