2019/12/18 by Saumya Mukherjee, Sung Won Jung, Sophie F. Weber +13 · 1 citation
Materials Science · Physics and Astronomy · #2D Materials and Applications #Condensed matter physics #Dirac (video compression format) #Dirac fermion #Electron #Fermi energy #Fermi level #Fermi surface #Fermion #Ferromagnetism #Geometry #Graphene research and applications #Physics #Quantum mechanics #Quasiparticle #Spin (aerodynamics) #Spintronics #Surface (topology) #Surface states #Topological Materials and Phenomena #Topology (electrical circuits) #cond-mat.mtrl-sci
paper · pdf · doi:10.1038/s41598-020-69926-8
arxiv created 2019/12/18 · openalex publication_date 2020/07/31 · arxiv updated 2020/08/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract Transition-metal dichalcogenides (TMDs) offer an ideal platform to experimentally realize Dirac fermions. However, typically these exotic quasiparticles are located far away from the Fermi level, limiting the contribution of Dirac-like carriers to the transport properties. Here we show that NiTe 2 hosts both bulk Type-II Dirac points and topological surface states. The underlying mechanism is shared with other TMDs and based on the generic topological character of the Te p -orbital manifold. However, unique to NiTe 2 , a significant contribution of Ni d orbital states shifts the energy of the Type-II Dirac point close to the Fermi level. In addition, one of the topological surface states intersects the Fermi energy and exhibits a remarkably large spin splitting of 120 meV. Our results establish NiTe 2 as an exciting candidate for next-generation spintronics devices.