95 research outputs found

    Topologically Stratified Energy Minimizers in a Product Abelian Field Theory

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    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 NsN_s vortices and PsP_s anti-vortices (s=1,2s=1,2) 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 SS which states that a solution with prescribed N1,N2N_1, N_2 vortices and P1,P2P_1,P_2 anti-vortices of two designated species exists if and only if the inequalities ∣N1+N2βˆ’(P1+P2)∣<∣Sβˆ£Ο€,∣N1+2N2βˆ’(P1+2P2)∣<∣Sβˆ£Ο€, \left|N_1+N_2-(P_1+P_2)\right|<\frac{|S|}{\pi},\quad \left|N_1+2N_2-(P_1+2P_2)\right|<\frac{|S|}{\pi}, hold simultaneously, which give bounds for the `differences' of the vortex and anti-vortex numbers in terms of the total surface area of SS. The minimum energy of these solutions is shown to assume the explicit value E=4Ο€(N1+N2+P1+P2), E= 4\pi (N_1+N_2+P_1+P_2), 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

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    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 TcT_{c} 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 (dzdz) 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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