7,198 research outputs found
P-T phase diagram of a holographic s+p model from Gauss-Bonnet gravity
In this paper, we study the holographic s+p model in 5-dimensional bulk
gravity with the Gauss-Bonnet term. We work in the probe limit and give the
-T phase diagrams at three different values of the Gauss-Bonnet
coefficient to show the effect of the Gauss-Bonnet term. We also construct the
P-T phase diagrams for the holographic system using two different definitions
of the pressure and compare the results.Comment: 17 pages, 5 figures, we have added new P-T phase diagrams with the
pressure defined in boundary stress-energy tenso
Spin-Orbit Coupled Fermi Gases across a Feshbach Resonance
In this letter we study both ground state properties and the superfluid
transition temperature of a spin-1/2 Fermi gas across a Feshbach resonance with
a synthetic spin-orbit coupling, using mean-field theory and exact solution of
two-body problem. We show that a strong spin-orbit coupling can significantly
enhance the pairing gap for 1/(k_F a_s)<=0 due to increased density-of-state.
Strong spin-orbit coupling also significantly enhances the superfluid
transition temperature when 1/(k_F a_s)<=0, while suppresses it slightly when
1/(k_F a_s)>0. The universal interaction energy and pair size at resonance are
also discussed.Comment: 4+3 pages, 4 figures, supplementary material adde
Split degenerate states and stable p+ip phases from holography
In this paper, we investigate the p+p superfluid phases in the complex
vector field holographic p-wave model. We find that in the probe limit, the
p+p phase and the p-wave phase are equally stable, hence the p and p
orders can be mixed with an arbitrary ratio to form more general p+p
phases, which are also equally stable with the p-wave and p+p phases. As a
result, the system possesses a degenerate thermal state in the superfluid
region. We further study the case with considering the back reaction on the
metric, and find that the degenerate ground states will be separated into
p-wave and p+p phases, and the p-wave phase is more stable. Finally, due to
the different critical temperature of the zeroth order phase transitions from
p-wave and p+p phases to the normal phase, there is a temperature region
where the p+p phase exists but the p-wave phase doesn't. In this region we
find the stable p+p phase for the first time.Comment: 16 pages, 5 figures; typos correcte
Stability Condition of a Strongly Interacting Boson-Fermion Mixture across an Inter-Species Feshbach Resonance
We study the properties of dilute bosons immersed in a single component Fermi
sea across a broad boson-fermion Feshbach resonance. The stability of the
mixture requires that the bare interaction between bosons exceeds a critical
value, which is a universal function of the boson-fermion scattering length,
and exhibits a maximum in the unitary region. We calculate the quantum
depletion, momentum distribution and the boson contact parameter across the
resonance. The transition from condensate to molecular Fermi gas is also
discussed.Comment: 4 pages, 4 figure
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