Abstract
The spin–orbit split quantized states for electrons confined in IV–VI lead-salt asymmetric quantum wells (QWs), grown on both (100) and (111) substrates, are obtained analytically within the envelope function approximation with a k ⋅ p four-band model for the bulk. Nonparabolicity, anisotropy, and break of valley degeneracy are included. In (111) QWs, it is shown that for the valley along the growth direction the Rashba splitting is like the one in III–V QWs, i.e., isotropic and linear in k∣ (for k∣ ∼ 0). For the oblique valleys, contrary to the III–V case, a Rashba effect is obtained that is anisotropic and described by an effective magnetic field with nonzero component along the growth direction. Specific results for PbTe/PbEuTe asymmetric QWs with large Rashba splittings are shown.
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