Spin and valley-orbit splittings in SiGe/Si heterostructures

Details Spin and valley-orbit splittings in SiGe/Si heterostructures Spin and valley-orbit splittings in SiGe/Si heterostructures

2006-01-23

arxiv.org/abs/cond-mat/0601520v1

Phys. Rev. B 73, 235334 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 5 figures

Scientific paper

10.1103/PhysRevB.73.235334

Spin and valley-orbit splittings are calculated in SiGe/Si/SiGe quantum wells (QWs) by using the tight-binding approach. In accordance with the symmetry considerations an existence of spin splitting of electronic states in perfect QWs with an odd number of Si atomic planes is microscopically demonstrated. The spin splitting oscillates with QW width and these oscillations related to the inter-valley reflection of an electron wave from the interfaces. It is shown that the splittings under study can efficiently be described by an extended envelope-function approach taking into account the spin- and valley-dependent interface mixing. The obtained results provide a theoretical base to the experimentally observed electron spin relaxation times in SiGe/Si/SiGe QWs.

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