Spin-locked transport in a two-dimensional electron gas

S. Anghel, F. Passmann, K. J. Schiller, J. N. Moore, G. Yusa, T. Mano, T. Noda, M. Betz, A. D. Bristow

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Spin-orbit interactions in solids have inspired innovative physics for spin-based technologies. One such example is the persistent spin helix, where spin-orbit interactions from the semiconductor lattice are balanced with those in asymmetric quantum wells, to create long-lived spin textures. Spin transport in the presence of the momentum-dependent spin-orbit interactions lead to Larmor precession and subsequent dephasing that challenges the design of current spin-based information processing devices. We demonstrate that external magnetic fields can be applied to overcome this issue for spin-polarized charge carriers transported by in-plane electric fields. A frame of reference picture is introduced to describe the emergence and dynamics of the polarization-locked spin-wave packet after optical excitation. Applying well-matched magnetic fields maintains the persistent spin-helix profile regardless of whether the frame of reference is in motion or not. Monte Carlo simulations allow this traveling persistent spin-helix concept to be extended to a proposed spin Hall-effect transistor to ease design requirements.

Original languageEnglish
Article number155414
JournalPhysical Review B
Volume101
Issue number15
DOIs
Publication statusPublished - 2020 Apr 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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