7 research outputs found
Quartetting in Nuclear Matter
A general theory for the condensation of strongly bound quartets in infinite
nuclear matter is presented. Critical temperatures for symmetric and asymmetric
nuclear matter are evaluated. A fully nonlinear theory for the quartet order
parameter, based on an analogy of the Gorkov approach to pairing, is presented
and solved. The strong qualitative difference with pairing is pointed out
Phase space deformation of a trapped dipolar Fermi gas
We consider a system of quantum degenerate spin polarized fermions in a
harmonic trap at zero temperature, interacting via dipole-dipole forces. We
introduce a variational Wigner function to describe the deformation and
compression of the Fermi gas in phase space and use it to examine the stability
of the system. We emphasize the important roles played by the Fock exchange
term of the dipolar interaction which results in a non-spherical Fermi surface.Comment: 5 pages, 5 figure
Density wave instability in a 2D dipolar Fermi gas
We consider a uniform dipolar Fermi gas in two-dimensions (2D) where the
dipole moments of fermions are aligned by an orientable external field. We
obtain the ground state of the gas in Hartree-Fock approximation and
investigate RPA stability against density fluctuations of finite momentum. It
is shown that the density wave instability takes place in a broad region where
the system is stable against collapse. We also find that the critical
temperature can be a significant fraction of Fermi temperature for a realistic
system of polar molecules.Comment: 10 figure