Will a bose-condensed exciton gas be superfluid? |
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Authors: | E. Hanamura H. Haug |
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Affiliation: | Institut für Theoretische Physik der Universität Frankfurt, 6 Frankfurt, Fed. Rep. Germany |
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Abstract: | For a system of Bose-condensed Wannier excitons, the second reduced density matrix for electrons and holes is shown to have the property of off-diagonal long-range order (ODLRO). From the equation of motion for this density matrix, we derive the conservation laws which are relevant for a condensed exciton system. These equations are obtained by projecting the electron-hole density matrices into the exciton space. From the conservation laws, a two-fluid model follows, which describes the superfluid flow of the excitation energy. |
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