Singlet-triplet spin blockade in a few-electron lateral double quantum dot is investigated using simultaneous transport and charge-sensing measurements. Transport from the (1,1) to the (0,2) electron occupancy states is strongly suppressed relative to the opposite bias [(0,2) to (1,1)]. At large bias, spin blockade ceases as the (0,2) triplet state enters the transport window, giving a direct measure of exchange splitting as a function of magnetic field. A simple model for current and steady-state charge distribution in spin-blockade conditions is developed and found to be in excellent agreement with experiment.
@article{arxiv.cond-mat/0410679,
title = {Singlet-triplet spin blockade and charge sensing in a few-electron double quantum dot},
author = {A. C. Johnson and J. R. Petta and C. M. Marcus and M. P. Hanson and A. C. Gossard},
journal= {arXiv preprint arXiv:cond-mat/0410679},
year = {2009}
}
Comments
related papers available at http://marcuslab.harvard.edu