Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kondo Effect of a Jahn-Teller Ion Vibrating in a Cubic Anharmonic
  Potential   We discuss the Kondo effect in a spinless two-orbital conduction electron
system coupled with anharmonic Jahn-Teller vibration by employing a numerical
renormalization group technique. When a temperature $T$ is decreased, we
encounter a plateau of $\log 3$ entropy due to quasi-triple degeneracy of local
low-energy states, composed of vibronic ground states and the first excited
state with an excitation energy of $\Delta E$. Around at $T$$\approx$$\Delta
E$, we observe an entropy change from $\log 3$ to $\log 2$. This $\log 2$
entropy originates from the rotational degree of freedom of the vibronic state
and it is eventually released due to the screening by orbital moments of
conduction electrons, leading to the Kondo effect of a Jahn-Teller ion. The
Kondo temperature is explained by the effective $s$-$d$ model with anisotropic
exchange interactions.

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The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: mtrl-th
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: nlin