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Quasi-condensation of bilayer excitons in a periodic potential

Abstract : We study two-dimensional excitons confined in a lattice potential, for high fillings of the lattice sites. We show that a quasi-condensate is possibly formed for small values of the lattice depth, but for larger ones the critical phase-space density for quasi-condensation rapidly exceeds our experimental reach, due to the increase of the excitons effective mass. On the other hand, in the regime of a deep lattice potential where excitons are strongly localised at the lattice sites, we show that an array of phase-independent quasi-condensates, different from a Mott insulating phase, is realised.
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https://hal-cnrs.archives-ouvertes.fr/hal-03368562
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Submitted on : Wednesday, October 6, 2021 - 7:02:45 PM
Last modification on : Tuesday, October 19, 2021 - 11:24:31 AM

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PhysRevLett.126.067404.pdf
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Camille Lagoin, Stephan Suffit, Kenneth West, Kirk Baldwin, Loren Pfeiffer, et al.. Quasi-condensation of bilayer excitons in a periodic potential. Physical Review Letters, American Physical Society, 2021, 126 (6), pp.067404. ⟨10.1103/PhysRevLett.126.067404⟩. ⟨hal-03368562⟩

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