Spin-Hall conductivity and optical characteristics of noncentrosymmetric quantum spin Hall insulators: the case of PbBiI
arXiv:2405.03655 · doi:10.1038/s41598-024-77403-9
Abstract
Quantum spin Hall insulators have attracted significant attention in recent years. Understanding the optical properties and spin Hall effect in these materials is crucial for technological advancements. In this study, we present theoretical analyses to explore the optical properties, Berry curvature and spin Hall conductivity of pristine and perturbed PbBiI using the linear combination of atomic orbitals and the Kubo formula. The system is not centrosymmetric and it is hosting at the same time Rashba spin-splitting and quantized spin Hall conductivity. Our calculations reveal that the electronic structure can be modified using staggered exchange fields and electric fields, leading to changes in the optical properties. Additionally, the spin Berry curvature and spin Hall conductivity are investigated as a function of the energy and temperature. The results indicate that due to the small dynamical spin Hall conductivity, generating an ac spin current in PbBiI requires the use of external magnetic fields or magnetic materials.
7 pages and 9 figures
References in corpus (14)
- Non-Abelian Anyons and Topological Quantum Computation
- Quantum Spin Hall Insulator State in HgTe Quantum Wells
- Topological Insulators with Inversion Symmetry
- Topological Crystalline Insulators
- Dissipationless Quantum Spin Current at Room Temperature
- Scale-Invariant Dissipationless Chiral Transport in Magnetic Topological Insulators beyond the Two-Dimensional Limit
- Kondo effect in the helical edge liquid of the quantum spin Hall state
- Rashba type spin-orbit splitting of quantum well states in ultrathin Pb films
- Unconventional spin Hall effects in nonmagnetic solids
- Persistence of two-dimensional topological insulator state in wide HgTe quantum well
- Effects of charge dopants in quantum spin Hall materials
- Switchable large-gap quantum spin Hall state in two-dimensional MSiZ materials class
- Fast electrically switchable large gap quantum spin Hall states in MGeZ
- Unprotected edge modes in quantum spin Hall insulator candidate materials