Edge-spin accumulation in semiconductor two-dimensional hole gases

K. Nomura, J. Wunderlich, Jairo Sinova, B. Kaestner, A. H. MacDonald, T. Jungwirth

Research output: Contribution to journalArticlepeer-review

86 Citations (Scopus)

Abstract

The controlled generation of localized spin densities is a key enabler of semiconductor spintronics In this work, we study spin Hall effect induced edge-spin accumulation in a two-dimensional hole gas with strong spin orbit interactions. We argue that it is an intrinsic property, in the sense that it is independent of the strength of disorder scattering. We show numerically that the spin polarization near the edge induced by this mechanism can be large, and that it becomes larger and more strongly localized as the spin-orbit coupling strength increases, and is independent of the width of the conducting strip once this exceeds the elastic scattering mean-free-path. Our experiments in two-dimensional hole gas microdevices confirm this remarkable spin Hall effect phenomenology. Achieving comparable levels of spin polarization by external magnetic fields would require laboratory equipment whose physical dimensions and operating electrical currents are a million times larger than those of our spin Hall effect devices.

Original languageEnglish
Article number245330
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number24
DOIs
Publication statusPublished - 2005 Dec 15
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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