Long-lived fermionic Feshbach molecules with tunable $p$-wave interactions

Duda, Marcel; Bause, Roman; Schindewolf, Andreas; Bloch, Immanuel; Luo, Xinyu

doi:10.48550/arxiv.2202.06940

Cited by 4 publications

(6 citation statements)

References 31 publications

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“…clean uniform settings, e.g. multi-component gases [62][63][64], mass-imbalanced mixtures [65][66][67][68][69], and molecules [70,71]. A future work could leverage uniform Fermi gases to explore the regime b kin , where K 3 ∝ kin a 6 should no longer hold, and at low temperature many-body pairing mechanisms are expected to take over [19,20].…”

Section: (B)) [57]mentioning

confidence: 99%

On the Stability of the Repulsive Fermi Gas with Contact Interactions

Ji¹,

L.²,

Assumpção³

et al. 2022

Preprint

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We report the creation and the study of the stability of a repulsive quasi-homogeneous spin-1/2 Fermi gas with contact interactions. For the range of scattering lengths a explored, the dominant mechanism of decay is a universal three-body recombination towards a Feshbach bound state. We observe that the recombination coefficient K3 ∝ kina 6 , where the first factor, the average kinetic energy per particle kin, arises from a three-body threshold law, and the second one from the universality of recombination. Both scaling laws are consequences of Pauli blocking effects in three-body collisions involving two identical fermions. As a result of the interplay between Fermi statistics and the momentum dependence of the recombination process, the system exhibits non-trivial temperature dynamics during recombination, alternatively heating or cooling depending on its initial quantum degeneracy. The measurement of K3 provides an upper bound for the interaction strength achievable in equilibrium for a uniform repulsive Fermi gas.

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Section: (B)) [57]mentioning

confidence: 99%

On the Stability of the Repulsive Fermi Gas with Contact Interactions

Ji¹,

L.²,

Assumpção³

et al. 2022

Preprint

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“…On the contrary, one may expect that the resonance-to-bound transition can also be found in ultracold atomic systems (e.g., a Bose-Fermi mixture recently observed in Refs. [23,35]) by measuring the spectral function of the in-medium Feshbach molecule in the so-called weak-coupling Bardeen-Cooper-Schrieffer regime (a < 0). Indeed, the spectral function of the Feshbach molecules can be measured by the radio-frequency spectroscopy (e.g., Refs.…”

Section: In-medium 5 He Statementioning

confidence: 99%

“…Moreover, the polaron-molecule transition for a narrow s-wave resonance has also been investigated in the literature [20,21]. In this work, by describing the in-medium 5 He state within a two-channel model, which is well established for the study of manybody atomic systems near the Feshbach resonance, we draw an analogy of the resonance-to-bound transition of 5 He in neutron matter with heteronuclear Feshbach molecules coexisting with a Fermi sea in a Bose-Fermi mixture, where the transition from polaronic condensates to heteronuclear Feshbach molecules were recently observed [22,23].…”

Section: Introductionmentioning

confidence: 99%

Resonance-to-bound transition of $^5$He in neutron matter and its analogy with heteronuclear Feshbach molecule

Tajima¹,

Moriya²,

Horiuchi³

et al. 2022

Preprint

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We theoretically investigate the fate of a neutron-alpha p-wave resonance in dilute neutron matter, which may be encountered in neutron stars and supernova explosions. While 5 He is known as a resonant state that decays to a neutron and an alpha particle in vacuum, this unstable state turns into a stable bound state in the neutron Fermi sea because the decay process is forbidden by the Pauli-blocking effect of neutrons. Such a resonance-to-bound transition assisted by the Pauli-blocking effect can be realized in cold atomic experiments for a quantum mixture near the heteronuclear Feshbach resonance.

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“…Furthermore, degenerate Bose-Fermi mixtures such as 23 Na- 6 Li [2], 87 Rb-40 K [3,4], 173 Yb-174 Yb [5], 84 Sr-87 Sr [6], 41 K-40 K [7], and 7 Li- 6 Li [8,9] have been realized, and the Feshbach resonance in a 23 Na-40 K mixture has also been observed [10]. The strong interaction between a fermion and a boson in such systems may lead to unique quantum phenomena such as the quantum phase transition from a polaronic to a molecular phase [11] and the realization of longlived Bose-Fermi Feshbach molecules with the p-wave interaction in a 23 Na-40 K mixture [12]. Moreover, the field-linked resonance [13], which enables us to tune the molecule-molecule interaction, has been realized in a 23 Na- 40 K mixture towards the realization of molecular superfluid [14].…”

Section: Introductionmentioning

confidence: 99%

“…III, the numerical results are presented for the purpose of demonstration of the continuity picture in this system. For the numerical calculations, we consider m F /m f = (40 + 23)/40 = 1.575, which is relevant to the recent experiments of 23 Na-40 K mixture [11,12]. In Sec.…”

Section: Introductionmentioning

confidence: 99%

BCS-BCS crossover between atomic and molecular superfluids in a Bose-Fermi mixture

Guo¹,

Tajima²,

Hatsuda³

et al. 2023

Preprint

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We theoretically examine a continuity between atomic and molecular Fermi superfluids in a Bose-Fermi mixture near the Feshbach resonance. Considering a two-channel model describing the Feshbach resonance between Fermi and Bose atoms, we have constructed the mean-field framework based on the perturbative expansion of the Feshbach atom-dimer coupling. The resulting effective Hamiltonian exhibits not only the continuity between atom-atom to molecule-molecule Cooper pairings but also becomes equivalent to the two-band-superconductor model with Suhl-Matthias-Walker type pair-exchange coupling. We demonstrate how these atomic and molecular Fermi superfluids coexist within the two-band-like superfluid theory. The pair-exchange coupling and resulting superfluid gaps are found to be strongly enhanced near the Feshbach resonance due to the interplay between the infrared singularity of Bogoliubov phonons and their Landau damping arising from the coupling with fermions. The pair-exchange coupling can be probed via the observation of the intrinsic Josephson effect between atomic and molecular superfluids.

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Long-lived fermionic Feshbach molecules with tunable $p$-wave interactions

Cited by 4 publications

References 31 publications

On the Stability of the Repulsive Fermi Gas with Contact Interactions

On the Stability of the Repulsive Fermi Gas with Contact Interactions

Resonance-to-bound transition of $^5$He in neutron matter and its analogy with heteronuclear Feshbach molecule

BCS-BCS crossover between atomic and molecular superfluids in a Bose-Fermi mixture

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