Dynamics of coupled spins in quantum dots with strong spin-orbit interaction

Details Dynamics of coupled spins in quantum dots with strong spin-orbit interaction Dynamics of coupled spins in quantum dots with strong spin-orbit interaction

2008-07-23

arxiv.org/abs/0807.3654v1

Phys. Rev. B 79, 121306(R) (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.79.121306

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.

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