2005/07/31 by Ming‐Hao Liu, Ming-Hao Liu, Ching‐Ray Chang +1 · 16 citations
Engineering · Mathematics · Physics and Astronomy · #Boundary (topology) #Boundary value problem #Bounded function #Channel (broadcasting) #Computer science #Condensed matter physics #Coupling (piping) #Electrical engineering #Electron #Engineering #Materials science #Mathematical analysis #Mathematics #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #Reflection (computer programming) #Semiconductor materials and devices #Spin (aerodynamics) #Spin Hall effect #Spin polarization #Transistor #Voltage #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.73.205301
published in Physical Review B 73(20) (American Physical Society) · 5 pages, 4 figures, accepted for publication in Physical Review B
arxiv created 2006/04/18 · openalex publication_date 2006/05/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We analyze the spin expectation values for injected spin-polarized electrons (spin vectors) in a [001]-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 [110] is a robust channel direction and is therefore the best candidate for the design of the Datta-Das transistor.