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

Author(s): Sacksteder, Vincent E; Bernevig, Bogdan A

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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.
Publication Date: 29-Apr-2014
Citation: Sacksteder, Vincent E, Bernevig, B Andrei. (2014). Hole spin helix: Anomalous spin diffusion in anisotropic strained hole quantum wells. PHYSICAL REVIEW B, 89 (10.1103/PhysRevB.89.161307
DOI: doi:10.1103/PhysRevB.89.161307
ISSN: 1098-0121
EISSN: 1550-235X
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW B
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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