Quantized Vortices and Four-Component Superfluidity of Semiconductor Excitons
arXiv:1606.04755 · doi:10.1103/PhysRevLett.118.127402
Abstract
We study spatially indirect excitons of GaAs quantum wells, confined in a 10 microns electrostatic trap. Below a critical temperature of about 1 Kelvin, we detect macroscopic spatial coherence and quantised vortices in the weak photoluminescence emitted from the trap. These quantum signatures are restricted to a narrow range of density, in a dilute regime. They manifest the formation of a four-component superfluid, made by a low population of optically bright excitons coherently coupled to a dominant fraction of optically dark excitons.
9 pages, 8 figures
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- Optical signature of quantum coherence in fully dark exciton condensates
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- From hybrid polariton to dipolariton using non-hermitian Hamiltonians to handle particle lifetimes