TY - JOUR
T1 - Excitonic instability and electric-field-induced phase transition towards a two-dimensional exciton condensate
AU - Naveh, Y.
AU - Laikhtman, B.
PY - 1996
Y1 - 1996
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0000132993&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.77.900
DO - 10.1103/PhysRevLett.77.900
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AN - SCOPUS:0000132993
SN - 0031-9007
VL - 77
SP - 900
EP - 903
JO - Physical Review Letters
JF - Physical Review Letters
IS - 5
ER -