Interplay between resonant tunneling and spin precession oscillations in all-electric all-semiconductor spin transistors

Abstract

We investigate the transmission properties of a spin transistor coupled to two quantum point contacts acting as spin injector and detector. In the Fabry-Perot regime, transport is mediated by quasibound states formed between tunnel barriers. Interestingly, the spin-orbit interaction of the Rashba type can be tuned in such a way that nonuniform Rashba fields can point along distinct directions in different points of the sample. We discuss both spin-conserving and spin-flipping transitions as the spin-orbit angle of orientation increases from parallel to antiparallel configurations. Spin precession oscillations are clearly seen as a function of the length of the central channel. Remarkably, we find that these oscillations combine with the Fabry-Perot motion giving rise to quasiperiodic transmissions in the purely one-dimensional case. Furthermore, we consider the more realistic case of a finite width in the transverse direction and find that the coherent oscillations become deteriorated for moderate values of the spin-orbit strength. Our results then determine the precise role of the Rashba intersubband coupling potential in the Fabry-Perot-Datta-Das intermixed oscillations.

11 pages, 9 figures. Published version

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Cited by in corpus (4)

• Persistent Spin Textures in Semiconductor Nanostructures
• Spin filtering effect generated by the inter-subband spin-orbit coupling in the bilayer nanowire with the quantum point contact
• Spin Filtering via Resonant Reflection of Relativistic Surface States
• Spin-selective resonant tunneling induced by Rashba spin-orbit interaction in semiconductor nanowire