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Critical supercurrents and self organization in quantum Hall bilayers
We present a theory of interlayer tunneling in a disordered quantum Hall bilayer at total filling factor one, allowing for the effect of static vortices. In agreement with recent experiments [Phys. Rev. B 80, 165120 (2009); Phys. Rev. B 78, 075302 (2008)], we find that the critical current is proportional to the sample area and is comparable in magnitude to observed values. This reflects the formation of a Bean critical state as a result of current injection at the boundary. We predict a crossover to a critical current proportional to the square-root of the area in smaller samples.We also predict a peak in the critical current as the electron density varies at fixed layer separation.
Keyword(s): Condensed matter physics; quantum Hall bilayer; Nanoscience & Materials
Publication Date:
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: Trinity College Dublin
Citation(s): P. R. Eastham, N. R. Cooper, and D. K. K. Lee, Critical supercurrents and self organization in quantum Hall bilayers, Physical Review Letters, 105, 2010, 23680-
First Indexed: 2014-05-13 05:12:17 Last Updated: 2017-04-26 08:34:48