2020/09/30 by Camille Lagoin, Stephan Suffit, Kenneth West +4 · 1 citation
Physics and Astronomy · #cond-mat.quant-gas
paper · pdf · doi:10.1103/physrevlett.126.067404
published as Phys. Rev. Lett. 126, 067404 (2021) · 5 pages 4 figures
arxiv created 2020/12/07 · arxiv updated 2021/02/17
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.