Marche au hasard d’une quasi-particule massive dans le gaz de phonons d’un superfluide à très basse température

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

Branche d’excitation collective du continuum dans les gaz de fermions condensés par paires : étude analytique et lois d’échelle

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

Random walk of a massive quasiparticle in the phonon gas of an ultralow temperature superfluid

Autor: Castin, Yvan

Publikováno v: Comptes Rendus. Physique
Comptes Rendus. Physique, Académie des sciences (Paris), 2021, 21, pp.571

final (published) version, in English (38 pages) and in French (38 pages); International audience; We consider a 3D homogeneous superfluid at low temperature $T$ with 2 types of excitations, gapless phonons with a linear dispersion relation at low wa

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::afe0e66e1e2e185e4a122793071fa32b
https://hal.archives-ouvertes.fr/hal-02895083v2/file/francais.pdf

Collective excitation branch in the continuum of pair-condensed Fermi gases : analytical study et scaling laws

Autor: Castin, Yvan, Kurkjian, Hadrien

47 pages, in French; The pair-condensed unpolarized spin-1/2 Fermi gases have a collective excitation branch in their pair-breaking continuum (VA Andrianov, VN Popov, 1976). We study it at zero temperature, with the eigenenergy equation deduced from

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od_______212::b4a6eb15eadae9b35cf9bd755fb514d8
https://hal.archives-ouvertes.fr/hal-02196152/file/francais.pdf

Landau phonon-roton theory revisited for superfluid helium 4 and Fermi gases

Autor: Castin, Yvan, Sinatra, Alice, Kurkjian, Hadrien

Publikováno v: Physical Review Letters
Physical Review Letters, American Physical Society, 2017, 119, pp.260402. ⟨10.1103/PhysRevLett.119.260402⟩
Physical Review Letters, 2017, 119, pp.260402. ⟨10.1103/PhysRevLett.119.260402⟩

Augmented-corrected version in English (8 pages) and in French (9 pages); International audience; Liquid helium and spin-1/2 cold-atom Fermi gases both exhibit in their superfluid phase two distinct types of excitations, gapless phonons and gapped ro

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::deaf7b158b77b717d4a455ff0ae0d571
https://hal.archives-ouvertes.fr/hal-01570314v3/file/english.pdf