Influence of topological excitations on Shapiro steps and microwave dynamical conductance in bilayer exciton condensates

Abstract

The quantum Hall state at total filling factor ${\nu }_T=1$ in bilayer systems realizes an exciton condensate and exhibits a zero-bias tunneling anomaly, similar to the Josephson effect in the presence of fluctuations. In contrast to conventional Josephson junctions, no Fraunhofer diffraction pattern has been observed, due to disorder induced topological defects, so-called merons. We consider interlayer tunneling in the presence of microwave radiation, and find Shapiro steps in the tunneling current-voltage characteristic despite the presence of merons. Moreover, the Josephson oscillations can also be observed as resonant features in the microwave dynamical conductance.

References in corpus (8)

• Room-Temperature Superfluidity in Graphene Bilayers
• Exciton condensation and charge fractionalization in a topological insulator film
• Excitonic condensation of massless fermions in graphene bilayers
• Vortices, zero modes and fractionalization in bilayer-graphene exciton condensate
• 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

Cited by in corpus (1)

• Transport signatures of Van Hove singularities in mesoscopic twisted bilayer graphene