Condensation of excitons in a trap.

High, A A; Leonard, J R; Remeika, M; Butov, L V; Hanson, M; Gossard, A C · Nano Lett · 2012

basic_science · Level V

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Abstract

Condensation is observed in a gas of indirect excitons confined in an electrostatic trap. Imaging and interferometric measurements detect that excitons condense at the trap bottom and exciton spontaneous coherence emerges with lowering temperature. Below a temperature of about 1 K, the direct signature of Bose-Einstein condensation, the extension of coherence over the entire cloud, is observed.