5,716 research outputs found
Critical Temperature for Bose-Einstein condensation in quartic potentials
The quartic confining potential has emerged as a key ingredient to obtain
fast rotating vortices in BEC as well as observation of quantum phase
transitions in optical lattices. We calculate the critical temperature of
bosons at which normal to BEC transition occurs for the quartic confining
potential. Further more, we evaluate the effect of finite particle number on
and find that is larger in quartic potential as compared
to quadratic potential for number of particles . Interestingly, the
situation is reversed if the number of particles is .Comment: 2 figures, 5 pages, accepted for publication in Euro. Phys. J.
Isospin effects on the mass dependence of balance energy
We study the effect of isospin degree of freedom on balance energy throughout
the mass range between 50 and 350 for two sets of isotopic systems with N/Z =
1.16 and 1.33 as well as isobaric systems with N/Z = 1.0 and 1.4. Our findings
indicate that different values of balance energy for two isobaric systems may
be mainly due to the Coulomb repulsion. We also demonstrate clearly the
dominance of Coulomb repulsion over symmetry energy.Comment: 5 pages, 3 figures In this version the discussion is in terms of N/Z
whereas in the journal the whole discussion is in terms of N/A. The
conclusions remain unaffecte
Isospin effects on the system size dependence of balance energy in heavy-ion collisions
We study the effect of isospin degree of freedom on balance energy throughout
the mass range between 50 and 350 for two sets of isobaric systems with N/A =
0.5 and 0.58. Our fndings indicate that different values of balance energy for
two isobaric systems may be mainly due to the Coulomb repulsion. We also
demonstrate clearly the dominance of Coulomb repulsion over symmetry energy.Comment: EFB 2010, August29-september03, 2010 Salamanca, SPAI
Impact parameter dependence of isospin effects on the mass dependence of balance energy
We study the effect of isospin degree of freedom on the balance energy as
well as its mass dependence throughout the mass range 48-270 for two sets of
isobaric systems with N/Z = 1 and 1.4 using isospin-dependent quantum molecular
dynamics (IQMD) model. Our fndings reveal the dominance of Coulomb repulsion in
isospin effects on balance energy as well as its mass dependence throughout the
range of the colliding geometry.Comment: International Symposium on Quasifission Process in Heavy Ion
Reactions, Messina (ITLAY) November 8-9, 201
Phase separation of binary condensates in harmonic and lattice potentials
We propose a modified Gaussian ansatz to study binary condensates, trapped in
harmonic and optical lattice potentials, both in miscible and immiscible
domains. The ansatz is an apt one as it leads to the smooth transition from
miscible to immiscible domains without any {\em a priori} assumptions. In
optical lattice potentials, we analyze the squeezing of the density profiles
due to the increase in the depth of the optical lattice potential. For this we
develop a model with three potential wells, and define the relationship between
the lattice depth and profile of the condensate.Comment: 13 pages, 11 figures, additional references adde
Vortex reconnections between coreless vortices in binary condensates
Vortex reconnections plays an important role in the turbulent flows
associated with the superfluids. To understand the dynamics, we examine the
reconnections of vortex rings in the superfluids of dilute atomic gases
confined in trapping potentials using Gross-Petaevskii equation. Furthermore we
study the reconnection dynamics of coreless vortex rings, where one of the
species can act as a tracer.Comment: 9 pages, Proceeding from International Conference On Complex
Processes in Plasmas and Nonlinear Dynamical Systems, Gandhinagar, India
(November 2012
Evolution of Goldstone mode in binary condensate mixtures
We show that the third Goldstone mode in the two-species condensate mixtures,
which emerges at phase-separation, gets hardened when the confining potentials
have separated trap centers. The {\em sandwich} type condensate density
profiles, in this case, acquire a {\em side-by-side} density profile
configuration. We use Hartree-Fock-Bogoliubov theory with Popov approximation
to examine the mode evolution and density profiles for these phase transitions
at .Comment: 5 pages, 2 figures. Some part of the theory is common to
arXiv:1307.5716 and arXiv:1405:6459, so that the article is self-contained
for the benefit of the reader
Position swapping and pinching in Bose-Fermi mixtures with two-color optical Feshbach resonances
We examine the density profiles of the quantum degenerate Bose-Fermi mixture
of Yb-Yb, experimental observed recently, in the mean field
regime. In this mixture there is a possibility of tuning the Bose-Bose and
Bose-Fermi interactions simultaneously using two well separated optical
Feshbach resonances, and it is a good candidate to explore phase separation in
Bose-Fermi mixtures. Depending on the Bose-Bose scattering length a_\BB, as
the Bose-Fermi interaction is tuned the density of the fermions is pinched or
swapping with bosons occurs.Comment: 8 pages, 7 figure
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