Conserved Spin Quantity in Strained Hole Systems with Rashba and Dresselhaus Spin-Orbit Coupling

Abstract

We derive an effective Hamiltonian for a (001)-confined quasi-two-dimensional hole gas in a strained zincblende semiconductor heterostructure including both Rashba and Dresselhaus spin-orbit coupling. In the presence of uniaxial strain along the $⟨110⟩$ axes, we find a conserved spin quantity in the vicinity of the Fermi contours in the lowest valence subband. In contrast to previous works, this quantity meets realistic requirements for the Luttinger parameters. For more restrictive conditions, we even find a conserved spin quantity for vanishing strain, restricted to the vicinity of the Fermi surface.

14 pages, 4 figures

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• Emergence of the persistent spin helix in semiconductor quantum wells
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• Control of Spin Helix Symmetry in Semiconductor Quantum Wells by Crystal Orientation
• Spin blockade as a probe of Zeeman interactions in hole quantum dots
• Weak (anti)localization in tubular semiconductor nanowires with spin-orbit coupling
• Persistent spin textures and currents in wurtzite nanowire-based quantum structures
• Exchange interaction of hole-spin qubits in double quantum dots in highly anisotropic semiconductors
• Pseudospin-electric coupling for holes beyond the envelope-function approximation
• Enhanced longevity of the spin helix in low-symmetry quantum wells
• Spin relaxation in wurtzite nanowires