Journal
NATURE PHYSICS
Volume 18, Issue 2, Pages 149-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41567-021-01440-8
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Funding
- French Agency for Research [ANR-20-CE30-0032-01]
- Gordon and Betty Moore Foundation through the EPiQS initiative Grant [GBMF4420]
- National Science Foundation MRSEC Grant [DMR 1420541]
- Agence Nationale de la Recherche (ANR) [ANR-20-CE30-0032] Funding Source: Agence Nationale de la Recherche (ANR)
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In this research, the existence of a Mott phase was observed by exploring the Bose-Hubbard model with semiconductor excitons confined in a two-dimensional lattice. This provides a potential pathway for studying many-body phases that break lattice symmetry.
In condensed-matter physics, Mott insulators are an important phase involving strongly interacting electrons because of their intricate relationship with high-temperature superconductors(1,2). Mott phases were recently observed for both bosonic and fermionic species in atomic systems(3-9). However, in the solid state, the fingerprint of a Mott insulator implemented with bosons has yet to be found. Here we demonstrate such signature by exploring the Bose-Hubbard model using semiconductor excitons confined in a two-dimensional lattice. We emphasize the regime where on-site interactions are comparable to the energy separation between lattice-confined states. We then observe that a Mott phase is accessible, with at most two excitons uniformly occupying each lattice site. The technology introduced here allows us to programme the geometry of the lattice that confines the excitons. This versatility, combined with the long-range nature of dipolar interactions between excitons, provides a route to explore many-body phases that spontaneously break the lattice symmetry(10,11).
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