Vortex states of a disordered quantum Hall bilayer
Citation:
Eastham, PR, Cooper, NR, Lee, DKK, Vortex states of a disordered quantum Hall bilayer, Physical Review B, 80, 2009, 045302-Download Item:
Abstract:
We present and solve a model for the vortex configuration of a disordered quantum Hall bilayer in the limit
of strong and smooth disorder. We argue that there is a characteristic disorder strength below which vortices
will be rare and above which they proliferate. We predict that this can be observed tuning the electron density
in a given sample. The ground state in the strong-disorder regime can be understood as an emulsion of
vortex-antivortex crystals. Its signatures include a suppression of the spatial decay of counterflow currents. We
find an increase of at least an order of magnitude in the length scale for this decay compared to a clean system.
This provides a possible explanation of the apparent absence of leakage of counterflow currents through
interlayer tunneling, even in experiments performed deep in the coherent phase where enhanced interlayer
tunneling is observed.
Author's Homepage:
http://people.tcd.ie/easthampDescription:
PUBLISHED
Author: EASTHAM, PAUL
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Physical Review B80
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