We analyze the spin expectation values for injected spin-polarized electrons (spin vectors) in a -grown Rashba-Dresselhaus two-dimensional electron gas (2DEG). We generalize the calculation for point spin injection in semi-infinite 2DEGs to finite-size spin injection in bounded 2DEGs. Using the obtained spin vector formula, significance of the channel direction for the Datta-Das transistor is illustrated. Numerical results indicate that the influence due to the finite-size injection is moderate, while the channel boundary reflection may bring unexpected changes. Both effects are concluded to decrease when the spin-orbit coupling strength is strong. Hence  is a robust channel direction and is therefore the best candidate for the design of the Datta-Das transistor.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2006 May 2|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics