Moment of inertia and quadrupole response function of a trapped superfluid
F. Zambelli,Sandro Stringari +1 more
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In this paper, the authors derived an explicit relationship between the moment of inertia and the quadrupole response function of an interacting gas confined in a harmonic trap and showed that the relationship holds for both Bose and Fermi systems and is well suited to reveal the effects of irrotationality of the superfluid motion.Abstract:
We derive an explicit relationship between the moment of inertia and the quadrupole response function of an interacting gas confined in a harmonic trap. The relationship holds for both Bose and Fermi systems and is well-suited to reveal the effects of irrotationality of the superfluid motion. Recent experimental results on the scissors mode are used to extract the value of the moment of inertia of a trapped Bose gas and to point out the deviations from the rigid value due to superfluidity.read more
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Temperature dependence of damping and frequency shifts of the scissors mode of a trapped Bose-Einstein condensate.
TL;DR: From the frequency measurements, the moment of inertia of the gas is deduced and it is shown that it is quenched below the transition point, because of the superfluid nature of the condensed gas.
Journal ArticleDOI
Helium nanodroplets and trapped Bose–Einstein condensates as prototypes of finite quantum fluids
Franco Dalfovo,Sandro Stringari +1 more
TL;DR: In this article, the authors discuss analogies and differences of quantum many-body systems and briefly review some relevant concepts, such as the meaning of superfluidity in finite systems, the behavior of elementary excitations and collective modes, as well as rotational properties and quantized vorticity.
Journal ArticleDOI
Collisionless sound in a uniform two-dimensional Bose gas
Miki Ota,Fabrizio Larcher,Fabrizio Larcher,Franco Dalfovo,Lev P. Pitaevskii,Lev P. Pitaevskii,Nick P. Proukakis,Sandro Stringari +7 more
TL;DR: It is shown that the sudden removal of a static density perturbation produces a damped oscillatory behavior revealing that sound can propagate also in the absence of collisions, due to mean-field interaction effects.
Journal ArticleDOI
Helium nanodroplets and trapped Bose-Einstein condensates as prototypes of finite quantum fluids
Franco Dalfovo,Sandro Stringari +1 more
TL;DR: In this article, the authors discuss analogies and differences of quantum many-body systems and briefly review some relevant concepts, such as the meaning of superfluidity in finite systems, the behavior of elementary excitations and collective modes, as well as rotational properties and quantized vorticity.
Journal ArticleDOI
Evidence of superfluidity in a dipolar supersolid from nonclassical rotational inertia
TL;DR: In this paper, the scissors mode in a dipolar gas of dysprosium atoms has been investigated in the context of the elusive supersolid phase of matter, in which superfluidity coexists with a lattice structure.
References
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Quantized Vortices in Helium II
TL;DR: In this paper, the structure of quantized vortices is described and a nucleation procedure for quantized V2V arrays is proposed, which is based on quantum turbulence and mutual friction.
Journal ArticleDOI
Quantized Vortices in Helium II
TL;DR: In this paper, the structure of quantized vortices is described and a nucleation procedure for quantized V2V arrays is proposed, which is based on quantum turbulence and mutual friction.