Enhanced Kondo effect in an electron system dynamically coupled with local optical phonon

Hotta, Takashi

We discuss Kondo behavior of a conduction electron system coupled with local optical phonon by analyzing the Anderson-Holstein model with the use of a numerical renormalization group method. For $U_{rm ee}>U_{rm ph}$ with Coulomb interaction $U_{rm ee}$ and phonon-mediated attraction $U_{rm ph}$ , we observe the standard Kondo effect concerning spin degree of freedom and the Kondo temperature $T_{rm K}$ is increased when $U_{rm ph}$ is increased. On the other hand, for $U_{rm ee}<U_{rm ph}$ , there occurs the Kondo effect concerning charge degree of freedom and $T_{rm K}$ is decreased with the increase of $U_{rm ph}$ . Namely, $T_{rm K}$ should be maximized for $U_{rm ee}=U_{rm ph}$ . Then, we analyze in detail the Kondo behavior at $U_{rm ee}=U_{rm ph}$ , which is found to be explained by the polaron Anderson model. By comparing the results of the polaron Anderson model with those of the original Anderson-Holstein model, we clarify the Kondo behavior in the competing region of $U_{rm ee}=U_{rm ph}$ .

Language	:	English
Journal	:	Journal of the Physical Society of Japan
Volume	:	76
Number	:	8
Pages	:	p.084702_1 - 084702_8
Publication Year/Month	:	2007/08
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Paper URL	:	https://doi.org/10.1143/JPSJ.76.084702
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Registration No. : AA20070230
JAEA Abstracts No. : 35001485
Paper Submission No. : 3071

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