Interplay between the coherent and incoherent transport in quantum Hall bilayers

Abstract

We systematically study the coherent transport (Josephson tunneling and counterflow current) and its breakdown which leads to incoherent charge flow in in the excitonic BCS condensate formed in GaAs bilayers at ${\nu }_{tot}=1/2+1/2$. The Josephson currents in samples with three different interlayer distances vary by four orders of magnitude. In contrast, the breakdown thresholds for the ${\nu }_{tot}=1$ quantum Hall state are comparable. Furthermore, Coulomb drag in a Corbino ring reveals that the coherent counterflow current coexists with the dissipative charge transport.

References in corpus (5)

• Exciton Condensation and Perfect Coulomb Drag
• Critical tunneling currents in the regime of bilayer excitons
• Dominant parameters for the critical tunneling current in bilayer exciton condensates
• Area dependence of interlayer tunneling in strongly correlated bilayer 2D electron systems at ${\nu }_T=1$
• Critical currents and self organization in quantum Hall bilayers