Breakdown of Counterflow Superfluidity in a Disordered Quantum Hall Bilayer
Lee, D. K. K.
Eastham, P. R.
Cooper, N. R.
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Lee, D. K. K., Eastham, P. R., & Cooper, N. R. (2011). Breakdown of Counterflow Superfluidity in a Disordered Quantum Hall Bilayer. https://doi.org/10.1155/2011/792125
We present a theory for the regime of coherent interlayer tunneling in a disordered quantum Hall bilayer at total filling factor one, allowing for the effect of static vortices. We find that the system consists of domains of polarized superfluid phase. Injected currents introduce phase slips between the polarized domains which are pinned by disorder. We present a model of saturated tunneling domains that predicts a critical current for the breakdown of coherent tunneling that is extensive in the system size. This theory is supported by numerical results from a disordered phase model in two dimensions. We also discuss how our picture might be used to interpret experiments in the counterflow geometry and in two-terminal measurements.
External DOI: https://doi.org/10.1155/2011/792125
This record's URL: https://www.repository.cam.ac.uk/handle/1810/267561
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Rights Holder: Copyright © 2011 D. K. K. Lee et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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