Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-02-18
Phys. Rev. B 79 155302 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 4 figures; to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.79.155302
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.
da Silva Luis G. Dias
Dagotto Elbio
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