Exotic Kondo effects in electron–phonon systems

✍ Scribed by Takashi Hotta

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 125 KB
• Volume: 403
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2007.10.153

✦ Synopsis

We discuss the Kondo effect in the Anderson model dynamically coupled with two different types of local phonons by using a numerical renormalization group method. For Jahn-Teller phonon, a characteristic temperature T Ã is found to be monotonically decreased with increasing electron-phonon coupling constant a, while for Holstein phonon, T Ã is increased with the increase of a and it takes maximum when the Coulomb interaction competes with the phonon-mediated attraction. The Kondo behavior in such a competing region is discussed in detail.