Spin-orbit interaction and asymmetry effects on Kondo ridges at finite magnetic field
Abstract
We study electron transport through a serial double quantum dot with Rashba spin-orbit interaction (SOI) and Zeeman field of amplitude B in presence of local Coulomb repulsion. The linear conductance as a function of a gate voltage Vg equally shifting the levels on both dots shows two B=0 Kondo ridges which are robust against SOI as time-reversal symmetry is preserved. Resulting from the crossing of a spin-up and a spin-down level at vanishing SOI two additional Kondo plateaus appear at finite B. They are not protected by symmetry and rapidly vanish if the SOI is turned on. Left-right asymmetric level-lead couplings and detuned on-site energies lead to a simultaneous breaking of left-right and bonding-anti-bonding state symmetry. In this case the finite-B Kondo ridges in the Vg-B plane are bent with respect to the Vg-axis. For the Kondo ridge to develop different level renormalizations must be compensated by adjusting B.
Keywords
Cite
@article{arxiv.1011.5916,
title = {Spin-orbit interaction and asymmetry effects on Kondo ridges at finite magnetic field},
author = {S. Grap and S. Andergassen and J. Paaske and V. Meden},
journal= {arXiv preprint arXiv:1011.5916},
year = {2011}
}
Comments
8 pages, 5 figures, revised version as published