Evaluation of the Bychkov- Rashba Field from the Spin Resonance of Electrons in a Si Quantum Well

Details Evaluation of the Bychkov- Rashba Field from the Spin Resonance of Electrons in a Si Quantum Well Evaluation of the Bychkov- Rashba Field from the Spin Resonance of Electrons in a Si Quantum Well

2001-10-17

arxiv.org/abs/cond-mat/0110342v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

PDF, 4 pages

Scientific paper

From spin resonance of two-dimensional (2D) conduction electrons in a modulation doped SiGe/Si/SiGe quantum well structure we find a 2D anisotropy of both the line broadening (dephasing time) and the g-factor. We show that these can be explained consistently in terms of the Bychkov-Rashba (BR) field which here is the dominant coupling between electron motion and spin. We obtain a BR parameter of alpha = 1.1 e-12 eV cm - three orders of magnitude smaller as compared to III-V wells. Extrapolating for low electron concentrations we obtain a g-factor of the Si conduction band of 2.00073+/-0.00010.

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