Excitonic instability and electric-field-induced phase transition towards a two dimensional exciton condensate

Details Excitonic instability and electric-field-induced phase transition towards a two dimensional exciton condensate Excitonic instability and electric-field-induced phase transition towards a two dimensional exciton condensate

1996-05-27

arxiv.org/abs/cond-mat/9605166v1

Phys. Rev. Lett. 77, 900 (1996)

Physics

Condensed Matter

LaTex, 11 pages, 3 ps figures, To appear in PRL

Scientific paper

10.1103/PhysRevLett.77.900

We present an InAs-GaSb-based system in which the electric-field tunability of its 2D energy gap implies a transition towards a thermodynamically stable excitonic condensed phase. Detailed calculations show a 3 meV BCS-like gap appearing in a second-order phase transition with electric field. We find this transition to be very sharp, solely due to exchange interaction, and so, the exciton binding energy is greatly renormalized even at small condensate densities. This density gradually increases with external field, thus enabling the direct probe of the Bose-Einstein to BCS crossover.

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