How to make a bilayer exciton condensate flow

By Jung-Jung Su, Allan H. MacDonald. 2008

165 citations recorded by the source corpus.

Among the many examples of Bose condensation considered in physics, electron–hole-pair (exciton) condensation has maintained special interest because of controversy about condensate properties. Although ideal condensates can support an exciton supercurrent, it has not been clear how such a current could be induced or detected. This paper addresses the electrical generation of exciton supercurrents in bilayer condensates (systems in which the electrons and holes are in separate layers) and reaches a surprising conclusion. We find that steady-state dissipationless currents cannot be induced simply by connecting the two layers in series to guarantee opposite currents in electron and hole layers, as has long been supposed. Instead, current should be injected into and removed from the same layer, and a conducting channel supplied to close the counterflow portion of supercurrent in the other layer. Analysis of how condensation of an ensemble of bilayer excitons reorganizes the low-energy degrees of freedom of its constituent fermions suggests it should be possible to generate a dissipationless superflow in such a system.

Subfields: Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/fb8cc5c8bd673b13342ef811c2d2e0d44101d7ac

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In Atomic and Molecular Physics, and Optics

Citations in the corpus

Electronic properties of graphene-based bilayer systems (2015, background): “The exciton condensation could be observed by measuring the Coulomb drag [278, 279, 280].”
Bilayer PseudoSpin Field-Effect Transistor (BiSFET): A Proposed New Logic Device (2009, background): “Beyond that point, the current can only decrease, forcing the voltage drop across the device with the larger Imax back toward zero while that for the device with the smaller Imax increases into the NDR region.”