Sanjay Prabhakar

Electrical control of phonon mediated spin relaxation rate in semiconductor quantum dots: the Rashba vs the Dresselhaus spin-orbit couplings

Gregorio Millan Institute, Universidad Carlos III de Madrid, 28911, Leganes, Spain(Dated: May 15, 2013)In symmetric quantum dots (QDs), it is well known that the spin-hot spot (i.e., the cusp-likestructure due to the presence of degeneracy near the level or anticrossing point) is present for thepure Rashba case but is absent for the pure Dresselhaus case [Phys. Rev. Lett. 95, 076805 (2005)].Since the Dresselhaus spin-orbit coupling dominates over the Rashba spin-orbit coupling in GaAsand GaSb QDs, it is important to find the exact location of the spin-hot spot or the cusp-likestructure even for the pure Dresselhaus case. In this paper, for the first time, we present analyticaland numerical results that show that the spin-hot spot can also be seen for the pure Dresselhausspin-orbit coupling case by inducing large anisotropy through external gates. At or nearby the spin-hot spot, the spin transition rate enhances and the decoherence time reduces by several orders ofmagnitude compared to the case with no spin-hot spot. Thus one should avoid such locations whendesigning QD spin based transistors for the possible implementation in quantum logic gates, solidstate quantum computing and quantum information processing. It is also possible to extract theexact experimental data (Phys. Rev. Lett. 100, 046803 (2008)) for the phonon mediated spin-fliprates from our developed theoretical model.I. INTRODUCTION

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