Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-07-21
Phys. Rev. B 73, 205301 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 4 figures, accepted for publication in Physical Review B
Scientific paper
10.1103/PhysRevB.73.205301
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.
Chang Ching-Ray
Liu Ming-Hao
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