Zobrazeno 1 - 10
of 281
pro vyhledávání: '"Pitaevskii, L. P."'
Publikováno v:
Phys. Rev. A 97, 063615 (2018)
When the spectrum of magnetic excitations of a quantum mixture is much softer than the density spectrum, the system becomes effectively incompressible and can host magnetic defects. These are characterized by the presence of a topological defect in o
Externí odkaz:
http://arxiv.org/abs/1804.03937
Autor:
Pitaevskii, L. P.
Publikováno v:
Phys. Usp. 59, 1028 (2016); Usp. Fiz. Nauk 186, 1127 (2016)
A variety of solitary waves, such as solitons, vortex rings, solitonic vortices, and more complex entities, have recently been predicted to exist. They can move in superfluid ultracold gases along elongated traps. The theoretical description of this
Externí odkaz:
http://arxiv.org/abs/1702.04169
Publikováno v:
Phys. Rev. A 94, 023622 (2016)
We analyze theoretically the quantization of conductance occurring with cold bosonic atoms trapped in two reservoirs connected by a constriction with an attractive gate potential. We focus on temperatures slightly above the condensation threshold in
Externí odkaz:
http://arxiv.org/abs/1510.02618
Autor:
Pitaevskii, L. P.
This paper is devoted to the calculation of the momentum of localized excitations, such as solitons and vortex rings, moving in a superfluid. The direct calculation of the momentum by integration of the mass flux density results in a badly-converging
Externí odkaz:
http://arxiv.org/abs/1407.8081
We analyze theoretically the transport properties of a weakly-interacting ultracold Bose gas enclosed in two reservoirs connected by a constriction. We assume that the transport of the superfluid part is hydrodynamic, and we describe the ballistic tr
Externí odkaz:
http://arxiv.org/abs/1405.6026
Publikováno v:
Phys. Rev. A 88, 043639 (2013)
We present numerical calculations of the snake instability in a Fermi superfluid within the Bogoliubov-de Gennes theory of the BEC to BCS crossover using the random phase approximation complemented by time-dependent simulations. We examine the snakin
Externí odkaz:
http://arxiv.org/abs/1307.3717
Publikováno v:
EPL 102, 30004 (2013)
We study the solitonic Lieb II branch of excitations in one-dimensional Bose-gas in homogeneous and trapped geometry. Using Bethe-ansatz Lieb's equations we calculate the "effective number of atoms" and the "effective mass" of the excitation. The equ
Externí odkaz:
http://arxiv.org/abs/1210.8337
We investigate the response of superfluid Fermi gases to rapid changes of the three-dimensional s-wave scattering length a by solving the time-dependent Bogoliubov-de Gennes equations. In general the magnitude of the order parameter |\Delta| performs
Externí odkaz:
http://arxiv.org/abs/1209.2025
We consider a uniform superfluid confined in two compartments connected by a superleak and initially held at equal temperatures. If one of the two compartments is heated, a fraction of the superfluid will flow through the superleak. We show that, und
Externí odkaz:
http://arxiv.org/abs/1207.5137
Publikováno v:
New J. Phys. 14, 023044 (2012)
We study soliton collisions and the decay of solitons into sound in superfluid Fermi gases across the Bose-Einstein condensate to Bardeen-Cooper-Schrieffer (BEC-BCS) crossover by performing numerical simulations of the time-dependent Bogoliubov-de Ge
Externí odkaz:
http://arxiv.org/abs/1109.6444