Two channel orbital Kondo effect in quantum dot with SO(n) symmetry
Abstract
A scenario for the formation of symmetry protected non-Fermi-liquid (NFL) Kondo effect (KE) with spin variable enumerating Kondo channels is suggested and worked out. In doubly occupied symmetric triple quantum dot within parallel geometry, the NFL low-energy regime arises provided the device possesses both source-drain and left-right parity. Kondo screening follows a multistage renormalization group mechanism: reduction of the energy scale is accompanied by the change of the relevant symmetry group from SO(8) to SO(5). At low energy, three phases compete: 1) under-screening spin triplet (conventional) KE; 2) spin singlet potential scattering; 3) NFL phase where the roles of spin and orbital degrees of freedom are swapped.
Keywords
Cite
@article{arxiv.1210.4625,
title = {Two channel orbital Kondo effect in quantum dot with SO(n) symmetry},
author = {T. Kuzmenko and K. Kikoin and Y. Avishai},
journal= {arXiv preprint arXiv:1210.4625},
year = {2015}
}
Comments
9 two column pages, 4 .eps figures. Phys. Rev. B (published version)