Tuning Feshbach resonances in cold atomic gases with interchannel coupling

Deng, Tian-Shu; Zhang, Wei; Wu, Yi

doi:10.1103/physreva.96.050701

Cited by 8 publications

(7 citation statements)

References 45 publications

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“…This forces us to take into account the scattering state in the closed channel, that is to say, the so-called closed channel is not really "closed". The multi-orbital nature brings the physics into a new parameter regime that has not been explored before [39,[58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73]. Here we simply give couple examples.…”

Section: Discussionmentioning

confidence: 99%

Controlling the interaction of ultracold alkaline-earth atoms

et al. 2020

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Ultracold alkaline-earth atoms have now been widely explored for precision measurements and quantum simulation. Because of its unique atomic structure, alkaline earth atoms possess great advantages for quantum simulation and studying quantum many-body matters, such as simulating synthetic gauge field, Kondo physics and SU (N ) physics. To fully explore the potential of ultracold alkaline-earth atoms, these systems also need to be equipped with the capability of tuning the interatomic interaction to the strongly interacting regime. Recently several theoretical proposals and experimental demonstrations have shown that both spin-independent and spin-exchanging interaction can be tuned to resonance. In this perspective, we will review these progress and discuss the new opportunities brought by these interaction control tools for future quantum simulation studies with ultracold alkaline-earth atoms. arXiv:1908.04973v1 [cond-mat.quant-gas]

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Section: Discussionmentioning

confidence: 99%

Controlling the interaction of ultracold alkaline-earth atoms

et al. 2020

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“…In a previous study by one of the authors [19], we found that the optical field could dress the OFR and tune the scattering resonance location. We have given two different schemes, Raman scheme and Rabi scheme.…”

Section: Introductionmentioning

confidence: 73%

“…We considered the short-range interaction in two channels, + and -channels, in most part of our calculation in this work and previous work of one of the authors [19]. In fact, a more complete consideration of interaction should include all four channels , having the form of g [15].…”

Section: B Bound State Energy and Wavefunctionmentioning

confidence: 99%

Dressing the Orbital Feshbach Resonance using single-manifold Raman scheme

Han,

Deng

2018

Preprint

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The recently discovered Orbital Feshbach Resonance (OFR) offers the possibility of tuning the interaction between alkaline earth(-like) metal atoms with magnetic field. Here, we introduce a single-manifold Raman scheme to dress the OFR, which allows us to tune the interaction with the optical field and it is readily realizable in experiment. We demonstrate the scattering resonance could be shifted by the dressing Raman laser using few-body and many-body mean-field calculation, which give rise to an optical dependent two-body bound state and Raman coupling induced BCS-BEC crossover in the BCS-type mean field theory. Besides, we also discuss the application of single-manifold Raman scheme in Kondo research by writing down a Kondo lattice model.

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“…We can conclude that strong-coupling two-band Fermi superfluids, particularly near the orbital Feshbach resonance, are favorable for the experimental observation of Leggett collective excitations. At present, only the BEC case has been experimentally achieved for two-band atomic gases, but coupling parameters of a Fermi gas close to OFR can be experimentally tuned through the whole BCS-BEC crossover region and even into the BCS regime [28]. This makes the present study relevant for subsequent experiments.…”

Section: Discussionmentioning

confidence: 98%

Leggett collective excitations in a two-band Fermi superfluid at finite temperatures

2019

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The Leggett collective excitations for a two-band Fermi gas with s-wave pairing and Josephson interband coupling in the BCS-BEC crossover at finite temperatures are investigated within the Gaussian pair fluctuation approach. Eigenfrequencies and damping factors for Leggett modes are determined in a nonperturbative way, using the analytic continuation of the fluctuation propagator through a branch cut in the complex frequency plane, as in Kurkjian et al (2019 Phys. Rev. Lett. 122 093403). The treatment is performed beyond the low-energy expansion, which is necessary when the collective excitation energy reaches the pair-breaking continuum edge. The results are applied in particular to cold atomic gases at the orbital Feshbach resonance and in a regime far from BEC, which can be relevant for future experiments.

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Tuning Feshbach resonances in cold atomic gases with interchannel coupling

Cited by 8 publications

References 45 publications

Controlling the interaction of ultracold alkaline-earth atoms

Controlling the interaction of ultracold alkaline-earth atoms

Dressing the Orbital Feshbach Resonance using single-manifold Raman scheme

Leggett collective excitations in a two-band Fermi superfluid at finite temperatures

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