Enhanced Kondo Effect in an Electron System Dynamically Coupled with Local Optical Phonon

Details Enhanced Kondo Effect in an Electron System Dynamically Coupled with Local Optical Phonon Enhanced Kondo Effect in an Electron System Dynamically Coupled with Local Optical Phonon

2007-04-30

arxiv.org/abs/0704.3874v1

J. Phys. Soc. Jpn. 76, 084702 (2007).

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 8 figures

Scientific paper

10.1143/JPSJ.76.084702

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 (NRG) method. There appear three typical regions due to the balance between Coulomb interaction $U_{\rm ee}$ and phonon-mediated attraction $U_{\rm ph}$. For $U_{\rm ee}>U_{\rm ph}$, we observe the standard Kondo effect concerning spin degree of freedom. Since the Coulomb interaction is effectively reduced as $U_{\rm ee}-U_{\rm ph}$, the Kondo temperature $T_{\rm K}$ is increased when $U_{\rm ph}$ is increased. On the other hand, for $U_{\rm ee}

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