Sequential magnetotunneling in a vertical Quantum Dot tuned at the crossing to higher spin states
Mesoscale and Nanoscale Physics
2016-08-31 v1
Abstract
We have calculated the linear magnetoconductance across a vertical parabolic Quantum Dot with a magnetic field in the direction of the current. Gate voltage and magnetic field are tuned at the degeneracy point between the occupancies N=2 and N=3, close to the Singlet-Triplet transition for N=2. We find that the conductance is enhanced prior to the transition by nearby crossings of the levels of the 3 particle dot. Immediately after it is depressed by roughly 1/3, as long as the total spin S of the 3 electron ground state doesn't change from S=1/2 to S=3/2, due to spin selection rule. At low temperature this dip is very sharp, but the peak is recovered by increasing the temperature.
Keywords
Cite
@article{arxiv.cond-mat/9911224,
title = {Sequential magnetotunneling in a vertical Quantum Dot tuned at the crossing to higher spin states},
author = {B. Jouault and G. Santoro and A. Tagliacozzo},
journal= {arXiv preprint arXiv:cond-mat/9911224},
year = {2016}
}
Comments
6 pages, 5 figures, 1 table