2023/11/21 by Phusit Nualpijit, Nualpijit, Phusit, Kitakorn Jatiyanon +3
Materials Science · Physics and Astronomy · #2D Materials and Applications #FOS: Physical sciences #Graphene research and applications #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Topological Materials and Phenomena
paper · pdf · doi:10.48550/arxiv.2311.12377
openalex publication_date 2023/11/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The energy spectra of transition metal dichalcogenides are primarily influenced by the and orbitals. This results in a three-band model characterized by strong spin-orbit interaction. Investigating these bands using a projection into a two-band model is adequate for exploring electronic and optical properties. The topological phases, spin-valley Hall effect, derived from spin-valley Chern numbers, are also examined. The inclusion of spin-orbit interaction breaks inversion symmetry while maintaining time-reversal symmetry. This leads to the non-zero spin-valley dependent Hall conductivities, pivotal for both the spin Hall and valley Hall effects. These phenomena could have applications beyond traditional electronics, potentially encoding quantum bits. In particular, electrons at high-symmetry points, namely the K and K' points, might behave as if they are in a pseudospin-1 system with spin angular momentum of and , leading to triplet energy states. Such predictions could encourage super-Klein tunneling, which might offer insights into Majorana fermions, relevant for topological quantum computation.