Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical Control of Exchange Interaction and Kondo Temperature in cold
  Atom Gas   The relevance of magnetic impurity problems in cold atom systems depends
crucially on the nature of exchange interaction between itinerant fermionic
atoms and a localized impurity atom. In particular, Kondo physics occurs only
if the exchange interaction is anti-ferromagnetic, and strong enough to yield
high enough Kondo temperature ($T_K/T_F \ge 0.1$). Focusing, as an example, on
the experimentally accessible system of ultra-cold $^{173}$Yb atoms, it is
shown that the sign and strength of an exchange interaction between an
itinerant Yb($^{1}$S$_{0}$) atom and a trapped Yb($^{3}$P$_{0}$) atom can be
optically controlled. Explicitly, as the light intensity increases (from zero),
the exchange interaction changes from ferromagnetic to anti-ferromagnetic. When
the light intensity is just below a singlet Feshbach resonance, the singlet
scattering length $a_S$ is large and negative, and the Kondo temperature
increases sharply.

25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex