Modeling of gate-induced spin precession in a Ge 2DHG channel

The gate-induced spin precession in a Ge two-dimensional hole gas (2DHG) channel is studied by using a Monte Carlo transport model. The Rashba precession vector due to the spin-orbit coupling is randomized by the scattering events, leading to a non-negligible loss of spin coherence for an initially spin-polarized hole population in the channel. However, results from Monte Carlo simulation show that by operating at the liquid nitrogen temperature, or by using a narrow 2D-channel, the spin coherence can be efficiently conserved. Furthermore, the gate-controlled spin effect of the drain current induces a large improvement of transconductance, or a negative transconductance effect