Datta-Das-type spin-field-effect transistor in the nonballistic regime

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Ohno, Munekazu ; Yoh, Kanji (2008)
  • Publisher: American Physical Society
  • Journal: Physical Review. B, volume 77, issue 4, page 45,323 (issn: 1098-0121)
  • Subject:
    arxiv: Condensed Matter::Strongly Correlated Electrons | Condensed Matter::Mesoscopic Systems and Quantum Hall Effect

We analyzed the applicability of original Datta-Das proposal for spin-field-effect transistor (spin-FET) to nonballistic regime based on semiempirical Monte Carlo simulation for spin transport. It is demonstrated that the spin helix state in two-dimensional electron gas system is sufficiently robust against D'yakonov-Perel' spin relaxation to allow an operation of Datta-Das-type spin-FET in the nonballistic transport regime. It is also shown that the spin diffusion length of the spin helix state can be increased with an in-plane electrical field along the [110] direction. In marked contrast to early proposals for nonballistic spin-FETs, the “on” and “off” states are characterized by a 180° phase difference in the spin precession motions, which is highly advantageous in terms of device flexibility.
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