Phases, instabilities and excitations in a two-component lattice model with photon-mediated interactions
Abstract
Engineering long-range interacting spin systems with ultracold atoms offers the possibility to explore exotic magnetically ordered phases in strongly-correlated scenarios. Quantum gases in optical cavities provide a versatile experimental platform to further engineer photon-mediated interactions and access the underlying microscopic processes by probing the cavity field. Here, we study a two-component spin Bose-Hubbard system with cavity-mediated interactions. We provide a comprehensive overview of its phase diagram and transitions in experimentally relevant regimes. The interplay of different energy scales yields a rich phase diagram with superfluid and insulating phases exhibiting density modulation or spin ordering. In particular, the combined effect of contact and global-range interactions gives rise to an antiferromagnetically ordered phase for arbitrarily small spin-dependent light-matter coupling, while global-range and inter-spin contact interactions introduce regions of instability and phase separation in the phase diagram. We further study the low energy excitations above the antiferromagnetic phase. Besides particle-hole branches, it hosts spin-exchange excitations with a tunable energy gap. The studied lattice model can be readily realized in cold-atom experiments with optical cavities. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000624490Publication status
publishedExternal links
Journal / series
Physical Review ResearchVolume
Pages / Article No.
Publisher
American Physical SocietyOrganisational unit
03599 - Esslinger, Tilman / Esslinger, Tilman
08714 - Gruppe Huber
Funding
212168 - Tailoring interactions in quantum matter (SNF)
205584 - Next Generation Quantum Simulators: From DYNAMIical Gauge Fields to Lattice Gauge ThEory (SNF)
185902 - QSIT - Quantum Science and Technology (SNF)
742579 - Mass, heat and spin transport in interlinked quantum gases (EC)
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Is supplemented by: https://doi.org/10.3929/ethz-b-000627559
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