Mantelli, Davide and Moca, Catalin Pascu and Zarand, Gergely and Grifoni, Milena (2016) Kondo effect in a carbon nanotube with spin-orbit interaction and valley mixing: A DM-NRG study. PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 77. pp. 180-190. ISSN 1386-9477, 1873-1759
Full text not available from this repository. (Request a copy)Abstract
We investigate the effects of spin-orbit interaction (SOI) and valley mixing on the transport and dynamical properties of a carbon nanotube (CNT) quantum dot in the Kondo regime. As these perturbations break the pseudo-spin symmetry in the CNT spectrum but preserve time-reversal symmetry, they induce a finite splitting Delta between formerly degenerate Kramers pairs. Correspondingly, a crossover from the SU (4) to the SU(2)-Kondo effect occurs as the strength of these symmetry breaking parameters is varied. Clear signatures of the crossover are discussed both at the level of the spectral function as well as of the conductance. In particular, we demonstrate numerically and support with scaling arguments that the Kondo temperature scales inversely with the splitting Delta in the crossover regime. In presence of a finite magnetic field, time reversal symmetry is also broken. We investigate the effects of both parallel and perpendicular fields (with respect to the tube's axis) and discuss the conditions under which Kondo revivals may be achieved. (C) 2015 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | NUMERICAL RENORMALIZATION-GROUP; IMPURITY; MODEL; Kondo effect; Carbon nanotubes; Strong coupling; Density matrix numerical renormalization group |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 12 Mar 2019 08:24 |
| Last Modified: | 12 Mar 2019 08:24 |
| URI: | https://pred.uni-regensburg.de/id/eprint/2381 |
Actions (login required)
 |
View Item |
