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10 June 2006 Spin relaxation of holes in Ge quantum dots
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Proceedings Volume 6260, Micro- and Nanoelectronics 2005; 62600K (2006)
Event: Micro- and Nanoelectronics 2005, 2005, Zvenigorod, Russian Federation
Here we investigate theoretically the phonon-assisted spin relaxation of holes in Ge/Si quantum dots (QD). This mechanism is dominant for an isolated QD in external magnetic field H≥O.1 T. In the temperature range T<60 K there are two competitive phonon-assisted spin flip processes: direct one-phonon process (first-order to perturbative strain field) and Raman-type process (second-order). In the framework of tight-binding approximation, relaxation times τ(1) and τ(2), corresponding to these processes, were obtained. The relaxation time τ(1) weakly depends on temperature: τ(1)→const for T→0 (spontaneous transitions) and τ(1)~T-1 for higher T (when induced transitions are dominant). Magnetic field dependence of τ(1) is rather strong: τ(1)~H-5, while the rate of Raman-type processes is almost field-independent when T>gβH/k and strongly depends on the temperature: τ(2)~T-7.
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A. F. Zinovieva, A. V. Nenashev, and A. V. Dvurechenskii "Spin relaxation of holes in Ge quantum dots", Proc. SPIE 6260, Micro- and Nanoelectronics 2005, 62600K (10 June 2006);

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