Quasicondensation of Bilayer Excitons in a Periodic Potential

We study two-dimensional excitons confined in a lattice potential, for high fillings of the lattice sites. We show that a quasicondensate is possibly formed for small values of the lattice depth, but for larger ones the critical phase-space density for quasicondensation rapidly exceeds our experimental reach, due to an increase of the exciton effective mass. On the other hand, in the regime of a deep lattice potential where excitons are strongly localized at the lattice sites, we show that an array of phase-independent quasicondensates, different from a Mott insulator, is realized.

Automated summary

The study investigates two-dimensional excitons in a lattice potential with high fillings of lattice sites. It is found that a quasicondensate may form for small lattice depths, but as the lattice depth increases, the critical phase-space density for quasicondensation exceeds experimental reach due to an increase in exciton effective mass. On the other hand, in a deep lattice potential regime where excitons are strongly localized at lattice sites, an array of phase-independent quasicondensates, different from a Mott insulator, is realized.