Datta-Das transistor: Significance of channel direction, size dependence of source contacts, and boundary effects

Ming Hao Liu, Ching Ray Chang

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number205301
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number20
DOIs
Publication statusPublished - 2006 May 2

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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