Diamagnetism and flux creep in bilayer exciton superfluids

Abstract

We discuss the diamagnetism induced in an isolated quantum Hall bilayer with total filling factor one 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 predict a history-dependent diamagnetism that could persist on laboratory timescales. 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.

8 pages, 2 figures. v2: updated to accepted version, extended presentation

References in corpus (8)

• Critical tunneling currents in the regime of bilayer excitons
• Coherence and Optical Emission from Bilayer Exciton Condensates
• Dominant parameters for the critical tunneling current in bilayer exciton condensates
• Area dependence of interlayer tunneling in strongly correlated bilayer 2D electron systems at ${\nu }_T=1$
• Vortex states of a disordered quantum Hall bilayer
• Critical currents and self organization in quantum Hall bilayers
• Breakdown of counterflow superfluidity in a disordered quantum Hall bilayer
• Prediction of the quantization of magnetic flux in double layer exciton superfluids

Cited by in corpus (3)

• Theory for electric dipole superconductivity with an application for bilayer excitons
• Enhancement of spin propagation due to interlayer exciton condensation
• Coherent exciton transport in semiconductors