Journal
PHYSICAL REVIEW B
Volume 84, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.075130
Keywords
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Funding
- Deutsche Forschungsgemeinschaft [FI 1252/1, SFB-TR24, A5]
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Indirect excitons-pairs of electrons and holes spatially separated in semiconductor bilayers or quantum wells-are known to undergo Bose-Einstein condensation and to form a quantum fluid. Here we show that this superfluid may crystallize upon compression. However, further compression results in quantum melting back to a superfluid. This unusual behavior is explained by the effective interaction potential between indirect excitons, which strongly deviates from a dipole potential at small distances due to many-particle and quantum effects. Based on first-principles path-integral Monte Carlo simulations, we compute the complete phase diagram of this system and predict the relevant parameters necessary to experimentally observe exciton crystallization in semiconductor quantum wells.
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