Diamagnetism and flux creep in bilayer exciton superfluids

P. R. Eastham, N. R. Cooper, and D. K. K. Lee
Phys. Rev. B 85, 165320 – Published 25 April 2012

Abstract

We discuss the diamagnetism induced in an isolated quantum Hall bilayer with total filling factor νT=1 by an in-plane magnetic field. This is a signature of counterflow superfluidity in these systems. We calculate magnetically induced currents in the presence of pinned vortices nucleated by charge disorder, and we predict a history-dependent diamagnetism that could persist on laboratory time scales. For current samples, we find that the maximum in-plane moment is small, but with stronger tunneling the moments would be measurable using torque magnetometry. Such experiments would allow the persistent currents of a counterflow superfluid to be observed in an electrically isolated bilayer.

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  • Received 20 December 2011

DOI:https://doi.org/10.1103/PhysRevB.85.165320

©2012 American Physical Society

Authors & Affiliations

P. R. Eastham1, N. R. Cooper2, and D. K. K. Lee3

  • 1School of Physics, Trinity College, Dublin 2, Ireland
  • 2T. C. M. Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
  • 3Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom

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Issue

Vol. 85, Iss. 16 — 15 April 2012

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