Zobrazeno 1 - 10
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pro vyhledávání: '"Massignan A"'
Quantum vortices are commonly described as funnel-like objects around which the superfluid swirls, and their motion is typically modeled in terms of massless particles. Here, we show that, in Fermi superfluids, the normal component confined in the vo
Externí odkaz:
http://arxiv.org/abs/2410.12417
Autor:
Lokmanoglu, Ayse D., Winkler, Carol K., Damanhoury, Kareem El, Massignan, Virginia, Villa-Turek, Esteban, Chen, Keyu Alexander
With globalization's rise, economic interdependence's impacts have become a prominent factor affecting personal lives, as well as national and international dynamics. This study examines RT's public diplomacy efforts on its non-Russian Facebook accou
Externí odkaz:
http://arxiv.org/abs/2405.01798
Publikováno v:
SciPost Phys. 17, 076 (2024)
We characterize the dynamical instability responsible for the breakdown of regular rows and necklaces of quantized vortices that appear at the interface between two superfluids in relative motion. Making use of a generalized point-vortex model, we id
Externí odkaz:
http://arxiv.org/abs/2403.11987
The superfluid fraction $f$ of a quantum fluid is defined in terms of the response of the system to a weak and constant drag. Notably, Leggett long ago derived two simple expressions providing a rigorous upper bound and a heuristic lower bound for $f
Externí odkaz:
http://arxiv.org/abs/2403.08416
Publikováno v:
Phys. Rev. A 110, 023310 (2024)
We consider the problem of unitary Bose polarons, i.e., impurities interacting via a potential with infinite scattering length with a bath of weakly interacting bosons. We provide an analytic expression for the energy of a heavy impurity whose intera
Externí odkaz:
http://arxiv.org/abs/2311.14313
Publikováno v:
SciPost Phys. 17, 039 (2024)
Recent advances in cold-atom platforms have made real-time dynamics accessible, renewing interest in the motion of superfluid vortices in two-dimensional domains. Here we show that the energy and the trajectories of arbitrary vortex configurations ma
Externí odkaz:
http://arxiv.org/abs/2311.13545
Autor:
Baroni, Cosetta, Huang, Bo, Fritsche, Isabella, Dobler, Erich, Anich, Gregor, Kirilov, Emil, Grimm, Rudolf, Bastarrachea-Magnani, Miguel A., Massignan, Pietro, Bruun, Georg
Publikováno v:
Nat.Phys. 20 (2024) 68-73
The notion of quasi-particles is essential for understanding the behaviour of complex many-body systems. A prototypical example of a quasi-particle, a polaron, is an impurity strongly interacting with a surrounding medium. Fermi polarons, created in
Externí odkaz:
http://arxiv.org/abs/2305.04915
Publikováno v:
SciPost Phys. 15, 057 (2023)
We study a superfluid in a planar annulus hosting vortices with massive cores. An analytical point-vortex model shows that the massive vortices may perform radial oscillations on top of the usual uniform precession of their massless counterpart. Beyo
Externí odkaz:
http://arxiv.org/abs/2301.08493
Publikováno v:
Phys. Rev. A 106, 063307 (2022)
We study the motion of a superfluid vortex in condensates having different background density profiles, ranging from parabolic to uniform. The resulting effective point-vortex model for a generic power-law potential $\propto r^k$ can be experimentall
Externí odkaz:
http://arxiv.org/abs/2208.03172
Autor:
Cayla, Hugo, Massignan, Pietro, Giamarchi, Thierry, Aspect, Alain, Westbrook, Christoph I., Clément, David
Publikováno v:
Phys. Rev. Lett. 130, 153401 (2023)
We measure the momentum density in a Bose-Einstein condensate (BEC) with dilute spin impurities after an expansion in the presence of interactions. We observe tails decaying as $1/k^4$ at large momentum $k$ in the condensate and in the impurity cloud
Externí odkaz:
http://arxiv.org/abs/2204.10697