Abstract
The order formation and superfluidity are theoretically investigated in a quasi-two-dimensional Bose gas of excitons in a type-II quantum well. In previous work, we have studied the stationary state of the condensed excitons irradiated by a weak laser light at T=0 K , and showed that under the control of the external current, there appears a vortex lattice with a net supercurrent. In this work, we discuss the case of T≠0. At finite temperatures, the melting of the vortex lattice occurs and it destroys the superfluidity of excitons. On the basis of the theory on the formation of vortex lattice studied in previous work, we calculate the melting temperature assuming the Kosterlitz–Thouless-type defect-mediated melting mechanism.
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