Quasi-condensation 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 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 experim...

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Bibliographic Details
Published in:arXiv.org 2020-12
Main Authors: Lagoin, Camille, Suffit, Stephan, West, Kenneth, Baldwin, Kirk, Pfeiffer, Loren, Holzmann, Markus, Dubin, Francois
Format: Article
Language:English
Subjects:
Condensates
Excitons
Lattice sites
Space density
Online Access:Get full text
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.2009.07566