Phonon-assisted tunneling and two-channel Kondo physics in molecular junctions
| Autor: | da Silva, Luis G. Dias, Dagotto, Elbio |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 79 155302 (2009) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.79.155302 |
| Popis: | The interplay between vibrational modes and Kondo physics is a fundamental aspect of transport properties of correlated molecular conductors. We present theoretical results for a single molecule in the Kondo regime connected to left and right metallic leads, creating the usual coupling to a conduction channel with left-right parity ("even"). A center-of-mass vibrational mode introduces an additional, phonon-assisted, tunneling through the antisymmetric ("odd") channel. A non-Fermi liquid fixed point, reminiscent of the two-channel Kondo effect, appears at a critical value of the phonon-mediated coupling strength. Our numerical renormalization-group calculations for this system reveal non-Fermi-liquid behavior at low temperatures over lines of critical points. Signatures of this strongly correlated state are prominent in the thermodynamic properties and in the linear conductance. Comment: 5 pages, 4 figures; to appear in Phys. Rev. B |
| Databáze: | arXiv |
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