Repulsive interaction between indirect excitons |
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Indirect excitons are dipoles oriented perpendicular to the QW plane and an interaction between them is repulsive. The interaction-induced energy shift allows estimation of the density of indirect excitons. The repulsive interaction between the indirect excitons is advantageous for the exciton condensation: It stabilizes exciton state against formation of exciton molecules or metallic electron-hole droplets, increases the critical temperature for BEC, and results in a screening of an in-plane disorder potential. L.V. Butov, A. Zrenner, G. Bohm, G. Weimann, Condensation of indirect excitons in coupled AlAs/GaAs quantum wells, J. de Physique 3, 167 (1993). L.V. Butov, A. Zrenner, G. Abstreiter, G. Bohm, G. Weimann, Condensation of indirect excitons in coupled AlAs/GaAs quantum wells, Phys. Rev. Lett. 73, 304 (1994). L.V. Butov, A.A. Shashkin, V.T. Dolgopolov, K.L. Campman, and A.C. Gossard, Magneto-optics of the spatially separated electron and hole layers in GaAs/AlGaAs coupled quantum wells, Phys. Rev. B 60, 8753 (1999). L.V. Butov, A. Imamoglu, K.L. Campman, and A.C. Gossard, Coulomb effects in spatially separated electron and hole layers in coupled quantum wells, Zh. Eksp. Teor. Fiz. 119, 301 (2001) [JETP 92, 260 (2001)]. |
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