We investigated the time dependence of two-electron spin states in a double quantum dot fabricated in an InAs nanowire. In this system, spin-orbit interaction has substantial influence on the spin states of confined electrons. Pumping single electrons through a Pauli spin-blockade configuration allowed to probe the dynamics of the two coupled spins via their influence on the pumped current. We observed spin-relaxation with a magnetic field dependence different from GaAs dots, which can be explained by spin-orbit interaction. Oscillations were detected for times shorter than the relaxation time, which we attribute to coherent evolution of the spin states.
@article{arxiv.0807.3654,
title = {Dynamics of coupled spins in quantum dots with strong spin-orbit interaction},
author = {A. Pfund and I. Shorubalko and K. Ensslin and R. Leturcq},
journal= {arXiv preprint arXiv:0807.3654},
year = {2009}
}