Spin dynamics in a strongly driven system: very slow Rabi oscillations

Details Spin dynamics in a strongly driven system: very slow Rabi oscillations Spin dynamics in a strongly driven system: very slow Rabi oscillations

2012-03-23

arxiv.org/abs/1203.5287v1

Physical Review B V.85 p.125312 (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 5 figures

Scientific paper

10.1103/PhysRevB.85.125312

We consider joint effects of tunneling and spin-orbit coupling on driven by electric field spin dynamics in a double quantum dot with a multi-level resonance scenario. We demonstrate that tunneling plays the crucial role in the formation of the Rabi-like spin-flip transitions. In contrast to the linear behavior for weak electric fields, the spin flip rate becomes much smaller than expected for the two-level model and shows oscillating dependence on the driving field amplitude in stronger fields. In addition, the full spin flip is very difficult to achieve in a multi-level resonant system. These two effects have a similarity with the Zeno effect of slowing down the dynamics of an observable by its measurement. As a result, spin manipulation by electric field becomes much less efficient than expected.

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