Cavity-induced Fulde-Ferrell-Larkin-Ovchinnikov superfluids of ultracold Fermi gases

Zheng, Zhen; Wang, Z. D.

doi:10.1103/physreva.101.023612

Cited by 4 publications

(2 citation statements)

References 56 publications

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“…In Ref. [221], the possibility of generating the more exotic Fulde-Ferrel-Larkin-Ovchinnikov type of pairing-where the fermion pair has a net center-of-mass momentum-is discussed. As we discussed previously, for positive D 0 > 0 corresponding to ∆ c > 0, superradiance is strongly suppressed.…”

Section: Cavity-induced Superfluid Pairing Without Superradiancementioning

confidence: 99%

Cavity QED with Quantum Gases: New Paradigms in Many-Body Physics

Mivehvar,

Piazza,

Donner

et al. 2021

Preprint

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We review the recent developments and the current status in the field of quantum-gas cavity QED. Since the first experimental demonstration of atomic self-ordering in a system composed of a Bose-Einstein condensate coupled to a quantized electromagnetic mode of a high-Q optical cavity, the field has rapidly evolved over the past decade. The composite quantum-gas-cavity systems offer the opportunity to implement, simulate, and experimentally test fundamental solid-state Hamiltonians, as well as to realize non-equilibrium many-body phenomena beyond conventional condensed-matter scenarios. This hinges on the unique possibility to design and control in open quantum environments photon-induced tunable-range interaction potentials for the atoms using tailored pump lasers and dynamic cavity fields. Notable examples range from Hubbard-like models with long-range interactions exhibiting a lattice-supersolid phase, over emergent magnetic orderings and quasicrystalline symmetries, to the appearance of dynamic gauge potentials and nonequilibrium topological phases. Experiments have managed to load spin-polarized as well as spinful quantum gases into various cavity geometries and engineer versatile tunablerange atomic interactions. This led to the experimental observation of spontaneous discrete and continuous symmetry breaking with the appearance of soft-modes as well as supersolidity, density and spin self-ordering, dynamic spin-orbit coupling, and non-equilibrium dynamical self-ordered phases among others. In addition, quantum-gas-cavity setups offer new platforms for quantum-enhanced measurements. In this review, starting from an introduction to basic models, we pedagogically summarize a broad range of theoretical developments and put them in perspective with the current and near future state-of-art experiments.

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Section: Cavity-induced Superfluid Pairing Without Superradiancementioning

confidence: 99%

Cavity QED with Quantum Gases: New Paradigms in Many-Body Physics

Mivehvar,

Piazza,

Donner

et al. 2021

Preprint

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“…By exploiting more atomic internal levels and many cavity modes, a variety of rich phenomena ranging from magnetic ordering 20 , 21 to dynamic gauge fields 22 and self-ordering in elastic optical lattices 23 were observed in bosonic systems. Even more intriguing phenomena ranging from threshold-less self-ordering in low dimensions to cavity-induced superconducting pairing and topological states have been predicted for fermions 24 – 32 .…”

Section: Mainmentioning

confidence: 99%

Density-wave ordering in a unitary Fermi gas with photon-mediated interactions

Helson

Zwettler

Mivehvar

et al. 2023

Nature

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A density wave (DW) is a fundamental type of long-range order in quantum matter tied to self-organization into a crystalline structure. The interplay of DW order with superfluidity can lead to complex scenarios that pose a great challenge to theoretical analysis. In the past decades, tunable quantum Fermi gases have served as model systems for exploring the physics of strongly interacting fermions, including most notably magnetic ordering1, pairing and superfluidity2, and the crossover from a Bardeen–Cooper–Schrieffer superfluid to a Bose–Einstein condensate3. Here, we realize a Fermi gas featuring both strong, tunable contact interactions and photon-mediated, spatially structured long-range interactions in a transversely driven high-finesse optical cavity. Above a critical long-range interaction strength, DW order is stabilized in the system, which we identify via its superradiant light-scattering properties. We quantitatively measure the variation of the onset of DW order as the contact interaction is varied across the Bardeen–Cooper–Schrieffer superfluid and Bose–Einstein condensate crossover, in qualitative agreement with a mean-field theory. The atomic DW susceptibility varies over an order of magnitude upon tuning the strength and the sign of the long-range interactions below the self-ordering threshold, demonstrating independent and simultaneous control over the contact and long-range interactions. Therefore, our experimental setup provides a fully tunable and microscopically controllable platform for the experimental study of the interplay of superfluidity and DW order.

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