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pro vyhledávání: '"Castin, Yvan"'
Autor:
Endo, Shimpei, Castin, Yvan
Publikováno v:
Comptes Rendus. Physique, Vol 23, Iss G1, Pp 41-110 (2022)
We calculate the fourth cluster coefficients of the homogeneous unitary spin 1/2 Fermi gas as functions of the internal-state mass ratio, over intervals constrained by the 3- or 4-body Efimov effect. For this we use our 2016 conjecture (validated for
Externí odkaz:
https://doaj.org/article/78e8e76652564fb3a12fd5d317bc112a
Publikováno v:
Comptes Rendus. Physique, Vol 22, Iss 1, Pp 1-35 (2021)
We propose to take advantage of the very weak coupling of the ground-state helium-3 nuclear spin to its environment to produce very long-lived macroscopic quantum states, here nuclear spin squeezed states, in a gas cell at room temperature. To perfor
Externí odkaz:
https://doaj.org/article/954a68005b074a68ba5f20c5a8f89afc
Autor:
Castin, Yvan
Publikováno v:
Comptes Rendus. Physique, Vol 21, Iss 6, Pp 571-618 (2021)
We consider in dimension 3 a homogeneous superfluid at very low temperature $T$ having two types of excitations, (i) gapless acoustic phonons with a linear dispersion relation at low wave number, and (ii) gapped $\gamma $ quasiparticles with a quadra
Externí odkaz:
https://doaj.org/article/3ee2109e1f0a4303bf121c236aaa18c8
Autor:
Castin, Yvan
Publikováno v:
Comptes Rendus. Physique, Vol 21, Iss 3, Pp 203-219 (2020)
The superfluid, pair condensed spin-$1/2$ Fermi gases are supposed to exhibit at nonzero wave vector a still unobserved collective excitation mode in their pair-breaking continuum. Using BCS theory at zero temperature and in the long wavelength limit
Externí odkaz:
https://doaj.org/article/5761feac0c1b4362ab7e6602c600a496
Autor:
Castin, Yvan, Kurkjian, Hadrien
Publikováno v:
Comptes Rendus. Physique, Vol 21, Iss 3, Pp 253-310 (2020)
The pair-condensed unpolarized spin-$1/2$ Fermi gases have a collective excitation branch in their pair-breaking continuum (V.A. Andrianov, V.N. Popov, 1976). We study it at zero temperature, with the eigenenergy equation deduced from the linearized
Externí odkaz:
https://doaj.org/article/fa89b2b371554b59829b2d94eee7ab64
Autor:
Castin, Yvan
Publikováno v:
Physical Review Letters, 2024, 133, pp.109301
We present simple arguments suggesting that H. Biss et al [PRL 128, 100401 (2022)] did not measure with the required accuracy the low-wavenumber curvature of the acoustic excitation branch of the ground-state unitary Fermi gas. This difficult-to-calc
Externí odkaz:
http://arxiv.org/abs/2312.07994
Publikováno v:
Comptes Rendus. Physique, 2023, 24 (S3), pp.187-239
It is generally accepted that the phonon gas of a superfluid always enters a weak coupling regime at sufficiently low temperatures, whatever the strength of the interactions between the underlying particles (constitutive of the superfluid). Thus, in
Externí odkaz:
http://arxiv.org/abs/2307.12705
Autor:
Endo, Shimpei, Castin, Yvan
Publikováno v:
Comptes Rendus. Physique, Acad{\'e}mie des sciences (Paris), 2022, 23, pp.41
We calculate the fourth cluster coefficients of the homogeneous unitary spin 1/2 Fermi gas as functions of the internal-state mass ratio, over intervals constrained by the 3- or 4-body Efimov effect. For this we use our 2016 conjecture (validated for
Externí odkaz:
http://arxiv.org/abs/2203.00916
We propose to take advantage of the weak coupling of ground-state helium-3 nuclear spin to its environment to produce long-lived macroscopic quantum states, nuclear spin squeezed states, in a gas cell at room temperature. To perform a quantum non-dem
Externí odkaz:
http://arxiv.org/abs/2012.14686
Autor:
Castin, Yvan
Publikováno v:
Comptes Rendus Physique, Centre Mersenne, 2021, 21, pp.571
We consider a 3D homogeneous superfluid at low temperature $T$ with 2 types of excitations, gapless phonons with a linear dispersion relation at low wavenumber, and gapped quasiparticles with a quadratic dispersion relation around extrema. We calcula
Externí odkaz:
http://arxiv.org/abs/2007.10678