405 research outputs found
Time-Dependent Dynamics of the Bose-Fermi Mixed Condensed System
We study the monopole oscillation in the bose-fermi mixed condensed system by
performing the time-dependent Gross-Pitaevsky (GP) and Vlasov equations. We
find that the big damping exists for the fermion oscillation in the mixed
system even at zero temperatureComment: 5pages, 2 figure
Atomic Bose-Fermi mixed condensates with Boson-Fermion quasi-bound cluster states
The boson-fermion atomic bound states (composite fermion) and their roles for
the phase structures are studied in a bose-fermi mixed condensate of atomic gas
in finite temperature and density. The two-body scattering equation is
formulated for a boson-fermion pair in the mixed condensate with the
Yamaguchi-type potential. By solving the equation, we evaluate the binding
energy of a composite fermion, and show that it has small T-dependence in the
physical region, because of the cancellation of the boson- and fermion-
statistical factors in the equation. We also calculate the phase structure of
the BF mixed condensate under the equilibrium B+F -> BF, and discuss the role
of the composite fermions: the competitions between the degenerate state of the
composite fermions and the Bose-Einstein condensate (BEC) of isolated bosons.
The criterion for the BEC realization is obtained from the
algebraically-derived phase diagrams at T=0.Comment: 5 pages, 3 figure
Breathing Oscillations in Bose - Fermi Mixing Gases with Yb atoms in the Largely Prolate Deformed Traps
We study the breathing oscillations in bose-fermi mixtures with Yb isotopes
in the largely prolate deformed trap, which are realized by Kyoto group. We
choose the three combinations of the Yb isotopes, Yb170-Yb171, Yb170-Yb173 and
Yb174-Yb173, whose boson-fermion interactions are weakly repulsive, strongly
attractive and strongly repulsive. The collective oscillations in the deformed
trap are calculated in the dynamical time-development approach, which is
formulated with the time-dependent Gross-Pitaevskii and the Vlasov equations.
We analyze the results in the time-development approach with the intrinsic
oscillation modes of the deformed system, which are obtained using the scaling
method, and show that the damping and forced-oscillation effects of the
intrinsic modes give time-variation of oscillations, especially, in the fermion
transverse mode.Comment: 27 pages, 12 figure
The deformation of the interacting nucleon in the Skyrme model
Changes in the nucleon shape are investigated by letting the nucleon deform
under the strong interactions with another nucleon. The parameters of the axial
deformations are obtained by minimizing the static energy of the two nucleon
system at each internucleon distance . It is shown that the intrinsic
quadrupole moment of the interacting proton, , is about at
distances near fm.Comment: 11 pages, uudecode, gzip, tar, latex, 3 eps figures, accepted for the
publication by Phys.Lett.
Boson-Fermion pairing in a Boson-Fermion environment
Propagation of a Boson-Fermion (B-F) pair in a B-F environment is considered.
The possibility of formation of stable strongly correlated B-F pairs, embedded
in the continuum, is pointed out. The new Fermi gas of correlated B-F pairs
shows a strongly modified Fermi surface. The interaction between like particles
is neglected in this exploratory study. Various physical situations where our
new pairing mechanism could be of importance are invoked.Comment: 8 pages, 8 figers, to be published in Phys. Rev.
Peierls instability, periodic Bose-Einstein condensates and density waves in quasi-one-dimensional boson-fermion mixtures of atomic gases
We study the quasi-one-dimensional (Q1D) spin-polarized bose-fermi mixture of
atomic gases at zero temperature. Bosonic excitation spectra are calculated in
random phase approximation on the ground state with the uniform BEC, and the
Peierls instabilities are shown to appear in bosonic collective excitation
modes with wave-number by the coupling between the Bogoliubov-phonon
mode of bosonic atoms and the fermion particle-hole excitations. The
ground-state properties are calculated in the variational method, and,
corresponding to the Peierls instability, the state with a periodic BEC and
fermionic density waves with the period are shown to have a lower
energy than the uniform one. We also briefly discuss the Q1D system confined in
a harmonic oscillator (HO) potential and derive the Peierls instability
condition for it.Comment: 9 pages, 3figure
- …