95 research outputs found
Topologically Stratified Energy Minimizers in a Product Abelian Field Theory
We study a recently developed product Abelian gauge field theory by Tong and
Wong hosting magnetic impurities. We first obtain a necessary and sufficient
condition for the existence of a unique solution realizing such impurities in
the form of multiple vortices. We next reformulate the theory into an extended
model that allows the coexistence of vortices and anti-vortices. The two
Abelian gauge fields in the model induce two species of magnetic vortex-lines
resulting from vortices and anti-vortices () realized as the
zeros and poles of two complex-valued Higgs fields, respectively. An existence
theorem is established for the governing equations over a compact Riemann
surface which states that a solution with prescribed vortices
and anti-vortices of two designated species exists if and only if the
inequalities hold simultaneously, which
give bounds for the `differences' of the vortex and anti-vortex numbers in
terms of the total surface area of . The minimum energy of these solutions
is shown to assume the explicit value given in
terms of several topological invariants, measuring the total tension of the
vortex-lines.Comment: 22 page
BCS-BEC Crossover in Mix-dimensional Fermi Gases
We investigate a mix-dimensional Fermi-Fermi mixture in which one species is
confined in two-dimensional(2D) space while the other is free in
three-dimensional space(3D). We determine the superfluid transition temperature
for the entire BCS-BEC crossover including the important effects of
noncondensed pairs. We find that the transition temperature reduces while the
imbalance of mass is increased or lattice constant () is reduced. In
population imbalance case, the stability of superfluid is sharply destroyed by
increasing the polarization.Comment: 7 pages, 5 figure
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