Bose-Einstein condensation and superfluidity of excitons in Cu2O

Abstract : It is now well established that the remarkable superfluid properties of liquid helium below 2.17 K are intimately related to the Bose–Einstein condensation (BEC) of 4He atoms (no superfluidity is observed at the same temperature in 3He, a liquid of fermions). Already in the 1960s, it was pointed out that excitons in semiconductors could provide another system where BEC and superfluidity could be observed. S.A. Moskalenko, Soviet Phys. Solid State 4 (1962) 199, I.M. Blatt, K.W. Boer, W. Brandt, Phys. Rev. 126 (1962) 1691, V.A. Gergel, R.F. Kazarinov, R.A. Suris, Soviet Physics JETP 27 (1968) 159. Excitonic superfluidity corresponds to a frictionless transport of electronic energy through the crystal. Motivated by experimental evidence of high Bose–Einstein quantum degeneracy (D. Snoke et al., BEC, Cambridge University Press, Cambridge, 1994), a search for excitonic superfluidity has been undertaken in Cu2O. This paper reports on the current status in this material.
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E. Fortin, André Mysyrowicz. Bose-Einstein condensation and superfluidity of excitons in Cu2O. Journal of Luminescence, Elsevier, 2000, 87-89, pp.12-14. ⟨10.1016/S0022-2313(99)00206-9⟩. ⟨hal-00463714⟩

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