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We investigate the transmission properties of a spin transistor coupled totwo quantum point contacts acting as spin injector and detector. In theFabry-Perot regime, transport is mediated by quasibound states formed betweentunnel barriers. Interestingly, the spin-orbit interaction of the Rashba typecan be tuned in such a way that nonuniform Rashba fields can point alongdistinct directions in different points of the sample. We discuss bothspin-conserving and spin-flipping transitions as the spin-orbit angle oforientation increases from parallel to antiparallel configurations. Spinprecession oscillations are clearly seen as a function of the length of thecentral channel. Remarkably, we find that these oscillations combine with theFabry-Perot motion giving rise to quasiperiodic transmissions in the purelyone-dimensional case. Furthermore, we consider the more realistic case of afinite width in the transverse direction and find that the coherentoscillations become deteriorated for moderate values of the spin-orbitstrength. Our results then determine the precise role of the Rashbaintersubband coupling potential in the Fabry-Perot-Datta-Das intermixedoscillations.

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