Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Orbital Feshbach Resonance in Alkali-Earth Atoms   For a mixture of alkali-earth atomic gas in the long-lived excited state
${}^3P_0$ and ground state ${}^1S_0$, in addition to nuclear spin, another
"orbital" index is introduced to distinguish these two internal states. In this
letter we propose a mechanism to induce Feshbach resonance between two atoms
with different orbital and nuclear spin quantum numbers. Two essential
ingredients are inter-orbital spin-exchanging scattering and orbital dependence
of the Land\'e g-factors. Here the orbital degrees of freedom plays similar
role as electron spin degree of freedom in magnetic Feshbach resonance in
alkali-metal atoms. This resonance is particularly accessible for ${}^{173}$Yb
system. The BCS-BEC crossover in this system requires two fermion pairing order
parameters, and displays significant difference comparing to that in
alkali-metal system.

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The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: alg-geom