Magnetic orders in a Fermi gas induced by cavity-field fluctuations

Abstract

We study magnetic orders of fermions under cavity-assisted Raman couplings in a one-dimensional lattice at half filling. The cavity-enhanced atom-photon coupling introduces a dynamic long-range interaction between the fermions, which competes with the short-range on-site interaction and leads to a variety of magnetic orders. Adopting a numerical density-matrix-renormalization-group method, we investigate the various magnetic orders and map out the steady-state phase diagram. Interestingly, as all the phase transitions take place outside the superradiant regime, the magnetic orders are associated with cavity-field fluctuations with a vanishing number of photons on the mean-field level.

8 pages, 6 figures

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Cited by in corpus (13)

• Cavity QED with Quantum Gases: New Paradigms in Many-Body Physics
• Photo-induced electron pairing in a driven cavity
• Non-Hermitian Squeezed Polarons
• Cavity-mediated unconventional pairing in ultracold fermionic atoms
• Atomic self-organization emerging from tunable quadrature coupling
• Antiferromagnetic self-ordering of a Fermi gas in a ring cavity
• Cavity-induced emergent topological spin textures in a Bose Einstein condensate
• Cavityless self-organization of ultracold atoms due to the feedback-induced phase transition
• Fluctuation-Induced Bistability of Fermionic Atoms Coupled to a Dissipative Cavity
• Cavity-induced Fulde-Ferrell-Larkin-Ovchinnikov superfluids of ultracold Fermi gases
• Quantum phases of the biased two-chain-coupled Bose-Hubbard Ladder
• Higgs mode stabilization by photo-induced long-range interactions in a superconductor
• Tuning Density and Spin Ordering of Degenerate Fermi Gases in an Optical Cavity