We perform transport measurements on double quantum dots defined in Ge/Si core/shell nanowires and focus on Pauli spin blockade in the regime where tens of holes occupy each dot. We identify spin blockade through the magnetic field dependence of leakage current. We find both a dip and a peak in the leakage current at zero field. We analyze this behavior in terms of the quantum dot parameters such as coupling to the leads, interdot tunnel coupling as well as spin-orbit interaction. We find a lower bound for spin-orbit interaction with lso=500 nm. We also extract large and anisotropic effective Landeˊ g-factors, with larger g-factors in the direction perpendicular to the nanowire axis in agreement with previous studies and experiments but with larger values reported here.
@article{arxiv.1610.04596,
title = {Magnetic Field Evolution of Spin Blockade in Ge/Si Nanowire Double Quantum Dots},
author = {Azarin Zarassi and Zhaoen Su and Jeroen Danon and Jens Schwenderling and Moira Hocevar and Binh-Minh Nguyen and Jinkyoung Yoo and Shadi A. Dayeh and Sergey M. Frolov},
journal= {arXiv preprint arXiv:1610.04596},
year = {2017}
}