Asymmetry in a three-electron double quantum dot (DQD) allows spin blockade, when spin-3/2 (quadruplet) states and spin-1/2 (doublet) states have different charge configurations. We have observed this DQD spin blockade near the (1,2)-(2,1) charge transition using a pulsed-gate technique and a charge sensor. We then use this spin blockade to detect Landau-Zener-St\"uckelberg (LZS) interference and coherent oscillations between the spin quadruplet and doublet states. Such studies add to our understandings of coherence and control properties of three-spin states in a double dot, which in turn would benefit the explorations into various qubit encoding schemes in semiconductor nanostructures.
@article{arxiv.1610.04940,
title = {Spin blockade and coherent dynamics of high-spin states in a three-electron double quantum dot},
author = {Bao-Bao Chen and Bao-Chuan Wang and Gang Cao and Hai-Ou Li and Ming Xiao and Guang-Can Guo and Hong-Wen Jiang and Xuedong Hu and Guo-Ping Guo},
journal= {arXiv preprint arXiv:1610.04940},
year = {2020}
}