Unconventional spin texture in a non-centrosymmetric quantum spin Hall insulator

Abstract

We proposed that the simultaneous presence of both Rashba and band inversion can lead to a Rashba-like spin-splitting formed by two bands with the same in-plane helical spin texture. Because of this unconventional spin texture, the backscattering is forbidden in edge and bulk conductivity channels. We propose a new non-centrosymmetric honeycomb-lattice quantum spin Hall (QSH) insulator family formed by the IV, V, and VII elements with this property. The system formed by Bi, Pb and I atoms is mechanically stable and has both a large Rashba spin-splitting of 60 meV and a large nontrivial band gap of 0.14 eV. Since the edge and the bulk states are protected by the TR symmetry, contrary to what happens in most doped QSH insulators, the bulk states do not contribute to the backscattering in the electronic transport, allowing the construction of a spintronic device with less energy loss.

References in corpus (11)

• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• New Perspectives for Rashba Spin-Orbit Coupling
• Quantum Spin Hall Effect in Inverted Type II Semiconductors
• Strong spin-orbit splitting on Bi surfaces
• Computing topological invariants without inversion symmetry
• Wannier representation of Z_2 topological insulators
• One-dimensional Topological Edge States of Bismuth Bilayers
• Quantum transport in Rashba spin-orbit materials: A review
• Rashba type spin-orbit splitting of quantum well states in ultrathin Pb films
• Persistence of two-dimensional topological insulator state in wide HgTe quantum well

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• Giant Inverse Rashba-Edelstein Effect: Application to Monolayer OsBi${}_2$
• High throughput inverse design and Bayesian optimization of functionalities: spin splitting in two-dimensional compounds
• Superconductivity in Two-Dimensional Systems with Unconventional Rashba Bands
• A generic model with unconventional Rashba bands and giant spin galvanic effect
• Design of spin-orbital-textures in ferromagnetic/topological insulator interfaces
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• Spin-Hall conductivity and optical characteristics of noncentrosymmetric quantum spin Hall insulators: the case of PbBiI