Publications (3)0 Total impact
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ABSTRACT: In a dipolar Fermi gas, the anisotropic interaction between electric dipoles
can be turned into an effectively attractive interaction in the presence of a
rotating electric field. We show that the topological $p_{x}+ip_{y}$ superfluid
phase can be realized in a single-component dipolar Fermi gas trapped in a 2D
square optical lattice with this attractive interaction at low temperatures.
The $p_{x}+ip_{y}$ superfluid state has potential applications for topological
quantum computing. We obtain the phase diagram of this system at zero
temperature. In the weak-coupling limit, the p-wave superfluid phase is stable
for all filling factors. As the interaction strength increases, it is stable
close to filling factors $n=0$ or $n=1$, and phase separation takes place in
between. When the interaction strength is above a threshold, the system is
phase separated for any $0<n<1$. The transition temperature of the
$p_{x}+ip_{y}$ superfluid state is estimated and the implication for
experiments is discussed.
02/2012;
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ABSTRACT: We study the normal state of a 3-$d$ homogeneous dipolar Fermi gas beyond the
Hartree-Fock approximation. The correlation energy is found of the same order
as the Fock energy, unusually strong for a Fermi-liquid system. As a result,
the critical density of mechanical collapse is smaller than that estimated in
the Hartree-Fock approximation. With the correlation energy included, a new
energy functional is proposed for the trapped system, and its property is
explored.
10/2011;
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ABSTRACT: In a dipolar Fermi gas, the dipole-dipole interaction between fermions can be
turned into a dipolar Ising interaction between pseduospins in the presence of
an AC electric field. When trapped in a 2D optical lattice, such a dipolar
Fermi gas has a very rich phase diagram at zero temperature, due to the
competition between antiferromagnetism and superfluidity. At half filling, the
antiferromagnetic state is the favored ground state. The superfluid state
appears as the ground state at a smaller filling factor. In between there is a
phase-separated region. The order parameter of the superfluid state can display
different symmetries depending on the filling factor and interaction strength,
including d-wave ($d$), extend s-wave ($xs$), or their linear combination
($xs+i\times d$). The implication for the current experiment is discussed.
06/2011;
