Hole spin helix: Anomalous spin diffusion in anisotropic strained hole quantum wells

Vincent E. Sacksteder, B. Andrei Bernevig

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

We obtain the spin-orbit interaction and spin-charge coupled transport equations of a two-dimensional heavy hole gas under the influence of strain and anisotropy. We show that a simple two-band Hamiltonian can be used to describe the holes. In addition to the well-known cubic hole spin-orbit interaction, anisotropy causes a Dresselhaus-like term, and strain causes a Rashba term. We discover that strain can cause a shifting symmetry of the Fermi surfaces for spin up and down holes. We predict an enhanced spin lifetime associated with a spin helix standing wave similar to the Persistent Spin Helix which exists in the two-dimensional electron gas with equal Rashba and Dresselhaus spin-orbit interactions. These results may be useful both for spin-based experimental determination of the Luttinger parameters of the valence-band Hamiltonian and for creating long-lived spin excitations.

Original languageEnglish (US)
Article number161307
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number16
DOIs
StatePublished - Apr 29 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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