La vitesse critique de Landau d'une particule dans un superfluide de fermions

Castin, Yvan; Ferrier-Barbut, Igor; Salomon, Christophe

doi:10.1016/j.crhy.2015.01.005

Cited by 36 publications

(50 citation statements)

References 23 publications

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“…Recently, superfluidity was observed in an elongated 6 Li gas oscillating with respect to a 7 Li BEC [8]. Here, the onset of heating is predicted to occur for a relative velocity that equals the sum of the individual sound velocities [9]. In addition to these studies, superfluidity in BECs has been studied in a number of theoretical works based on the Gross-Pitaevskii equation [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Probing superfluidity of Bose-Einstein condensates via laser stirring

et al. 2016

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We investigate the superfluid behavior of a Bose-Einstein condensate of 6 Li molecules. In the experiment by Weimer et al., Phys. Rev. Lett. 114, 095301 (2015) a condensate is stirred by a weak, red-detuned laser beam along a circular path around the trap center. The rate of induced heating increases steeply above a velocity vc, which we define as the critical velocity. Below this velocity, the moving beam creates almost no heating. In this paper, we demonstrate a quantitative understanding of the critical velocity. Using both numerical and analytical methods, we identify the non-zero temperature, the circular motion of the stirrer, and the density profile of the cloud as key factors influencing the magnitude of vc. A direct comparison to the experimental data shows excellent agreement.

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Section: Introductionmentioning

confidence: 99%

Probing superfluidity of Bose-Einstein condensates via laser stirring

et al. 2016

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confidence: 99%

“…While the goal of simultaneous superfluidity in mixtures of 4 He-3 He still remains elusive due to strong inter-isotope interactions [5,6], Bose-Fermi superfluidity in an atomic gas isotopic mixture of 7 Li-6 Li has recently been realized [7]. The original interest [8,9] in such dual superfluid systems is now strongly intensified [10][11][12][13][14][15][16].The extension of Bose-Fermi superfluidity to mixtures of different elements is experimentally challenging, but holds the potential to open a larger arena of scientific studies. A large mass ratio between the components is predicted to alter the interaction energy between the superfluids [12] as well as the character of excitations across the Bose-Einstein condensate to Bardeen-CooperSchreiffer (BEC-BCS) crossover for the fermion pairs [15].…”

mentioning

confidence: 99%

“…The original interest [8,9] in such dual superfluid systems is now strongly intensified [10][11][12][13][14][15][16].…”

mentioning

confidence: 99%

“…A large mass ratio between the components is predicted to alter the interaction energy between the superfluids [12] as well as the character of excitations across the Bose-Einstein condensate to Bardeen-CooperSchreiffer (BEC-BCS) crossover for the fermion pairs [15]. Specific interaction strengths and mass ratios can aid the detection of exotic states such as the FuldeFerrell-Larkin-Ovchinnikov (FFLO) phase [10] and darkbright solitons [16].…”

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confidence: 99%

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Two-Element Mixture of Bose and Fermi Superfluids

et al. 2017

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We report on the production of a stable mixture of bosonic and fermionic superfluids composed of the elements 174 Yb and 6 Li which feature a strong mismatch in mass and distinct electronic properties. We demonstrate elastic coupling between the superfluids by observing the shift in dipole oscillation frequency of the bosonic component due to the presence of the fermions. The measured magnitude of the shift is consistent with a mean-field model and its direction determines the previously unknown sign of the interspecies scattering length to be positive. We also observe the exchange of angular momentum between the superfluids from the excitation of a scissors mode in the bosonic component through interspecies interactions. We explain this observation using an analytical model based on superfluid hydrodynamics.Ultracold atomic gases offer excellent opportunities to produce and investigate quantum matter, allowing fundamental studies in many-body physics and quantum simulation [1]. Beginning with the cooling of atoms to BoseEinstein condensation [2,3] and later followed by the achievement of superfluidity in atomic Fermi gases [4], such studies have found many parallels with the analogous superfluids of bosonic 4 He and fermionic 3 He as well as superconductors, familiar from condensed matter physics. While the goal of simultaneous superfluidity in mixtures of 4 He-3 He still remains elusive due to strong inter-isotope interactions [5,6], Bose-Fermi superfluidity in an atomic gas isotopic mixture of 7 Li-6 Li has recently been realized [7]. The original interest [8,9] in such dual superfluid systems is now strongly intensified [10][11][12][13][14][15][16].The extension of Bose-Fermi superfluidity to mixtures of different elements is experimentally challenging, but holds the potential to open a larger arena of scientific studies. A large mass ratio between the components is predicted to alter the interaction energy between the superfluids [12] as well as the character of excitations across the Bose-Einstein condensate to Bardeen-CooperSchreiffer (BEC-BCS) crossover for the fermion pairs [15]. Specific interaction strengths and mass ratios can aid the detection of exotic states such as the FuldeFerrell-Larkin-Ovchinnikov (FFLO) phase [10] and darkbright solitons [16]. Furthermore, species-selective potentials for relative positioning and selective addressing make two-element systems more amenable for systematic studies.In this paper, we report on the realization of a twoelement Bose-Fermi superfluid mixture of 174 Yb-6 Li. We measure their coupling by observing the interactioninduced frequency shift of the bosonic dipole mode. We also detect transfer of angular momentum between the superfluids through the excitation of a scissors mode in the bosonic component. The scattering length a F of the two-spin alkali 6 Li fermionic system is tunable across the BEC-BCS crossover through a Feshbach resonance centered at 832 G, while the scattering length a B of the alkaline-earth-like bosonic Yb remains constant throughout. The...

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Correlations in Low-Dimensional Quantum Gases

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2018

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La vitesse critique de Landau d'une particule dans un superfluide de fermions

Cited by 36 publications

References 23 publications

Probing superfluidity of Bose-Einstein condensates via laser stirring

Probing superfluidity of Bose-Einstein condensates via laser stirring

Two-Element Mixture of Bose and Fermi Superfluids

Correlations in Low-Dimensional Quantum Gases

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