Zobrazeno 1 - 10
of 150
pro vyhledávání: '"Massignan, Pietro"'
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
The theory of quantum Brownian motion describes the properties of a large class of open quantum systems. Nonetheless, its description in terms of a Born-Markov master equation, widely used in the literature, is known to violate the positivity of the
Externí odkaz:
http://hdl.handle.net/10150/622483
http://arizona.openrepository.com/arizona/handle/10150/622483
http://arizona.openrepository.com/arizona/handle/10150/622483
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
Publikováno v:
Atoms 10, 55 (2022)
Polaron quasiparticles are formed when a mobile impurity is coupled to the elementary excitations of a many-particle background. In the field of ultracold atoms, the study of the associated impurity problem has attracted a growing interest over the l
Externí odkaz:
http://arxiv.org/abs/2204.06984