Stable two-channel Kondo fixed point of an SU(3) quantum defect in a metal: renormalization group analysis and conductance spikes

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dc.creatorArnold, Michael
dc.creatorLangenbruch, Tobias
dc.creatorKroha, Johann
dc.date2007-07-27
dc.date2007-09-29
dc.date.accessioned2026-07-07T09:18:07Z
dc.date.available2026-07-07T09:18:07Z
dc.descriptionWe propose a physical realization of the two-channel Kondo (2CK) effect, where a dynamical defect in a metal has a unique ground state and twofold degenerate excited states. In a wide range of parameters the interactions with the electrons renormalize the excited double downward below the bare defect ground state, thus stabilizing the 2CK fixed point. In addition to the Kondo temperature T_K the three-state defect exhibits another low-energy scale, associated with ground-to-excited-state transitions, which can be exponentially smaller than T_K. Using the perturbative nonequilibrium renormalization group we demonstrate explicitly that this can provide the long-sought explanation of the sharp conductance spikes observed by Ralph and Buhrman in ultrasmall metallic point contacts.
dc.description4 pages, 4 figures, published version, to appear in PRL
dc.identifierhttps://arxiv.org/abs/0707.4152
dc.identifierhttp://arxiv.org/abs/0707.4152
dc.identifierPhys. Rev. Lett. 99, 186601 (2007)
dc.identifierdoi:10.1103/PhysRevLett.99.186601
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/153910
dc.subjectMesoscale and Nanoscale Physics
dc.subjectStrongly Correlated Electrons
dc.titleStable two-channel Kondo fixed point of an SU(3) quantum defect in a metal: renormalization group analysis and conductance spikes
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