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Vortex pseudomomentum and dissipation in a superfluid vortex lattice
(IOP Publishing, 2008-07)
We propose an alternative approach to the dissipative vortex dynamics occurring in a superfluid vortex lattice at finite temperatures. Focusing upon the pseudomomentum of a vortex and its surrounding quasiparticles, we ...
Transition to quantum turbulence in finite-size superfluids
(WILEY-BLACKWELL, 2011)
A novel concept of quantum turbulence in finite size superfluids, such as trapped bosonic atoms, is discussed. We have used an atomic (87)Rb Bose-Einstein condensate (BEC) to study the emergence of this phenomenon. In our ...
Dual cascade and dissipation mechanisms in helical quantum turbulence
(American Physical Society, 2017-05)
While in classical turbulence helicity depletes nonlinearity and can alter the evolution of turbulent flows, in quantum turbulence its role is not fully understood. We present numerical simulations of the free decay of a ...
Stationary Vortices and Pair Currents in a Trapped Fermion Superfluid
(Springer/Plenum Publishers, 2015-05)
We examine the effects of stationary vortices in superfluid Li atoms at
zero temperature in the frame of the recently developed fluiddynamical scheme, that
includes the pair density and its associated pair current and ...
Superfluid 4He: brief notes on collective energy excitations and specific heat.
(Instituto de Física USPSão Paulo, 2013)
These brief notes about some amazing properties of the helium superfluid have been written to graduate and postgraduate students of physics. We have estimated some collective energy excitations (linear vortices, energy ...
Vortex dynamics in Bose-Einstein condensates: Numerical calculations
(SP MAIK Nauka/Interperiodica, 2009-04)
We numerically study properties of the dynamics of vortices in nonrotating Bose-Einstein condensates in the Thomas-Fermi regime. On the one hand, we compute the vortex energy as a function of its position and we predict, ...
Structure of vortices in two-component Bose-Einstein condensates
(American Physical Society, 2001-07)
We develop a three-dimensional analysis of the phase separation of two-species Bose-Einstein condensates in the presence of vorticity within the Thomas-Fermi approximation. We find different segregation features according ...
Nonlinear Schrodinger equation for a superfluid Bose gas from weak coupling to unitarity: Study of vortices
(Amer Physical Soc, 2008-03-01)
We introduce a nonlinear Schrodinger equation to describe the dynamics of a superfluid Bose gas in the crossover from the weak-coupling regime, where an(1/3)<<1 with a the interatomic s-wave scattering length and n the ...
Nonlinear Schrödinger equation for a superfluid Bose gas from weak coupling to unitarity: Study of vortices
(2008-03-18)
We introduce a nonlinear Schrödinger equation to describe the dynamics of a superfluid Bose gas in the crossover from the weak-coupling regime, where a n1/3 1 with a the interatomic s -wave scattering length and n the ...
Mutual friction in helium II: A microscopic approach
(American Institute of Physics, 2009-12)
We develop a microscopic model of mutual friction represented by the dissipative dynamics of a normal fluid flow which interacts with the helical normal modes of vortices comprising a lattice in thermal equilibrium. Such ...