2017/02/02 by Baojie Feng, Osamu Sugino, Ro-Ya Liu +15 · 8 citations
Materials Science · Physics and Astronomy · #Boron #Boron and Carbon Nanomaterials Research #Borophene #Condensed matter physics #Dirac (video compression format) #Dirac fermion #Dirac spinor #Electronic structure #Germanene #Graphene #Graphene research and applications #Helical Dirac fermion #Lattice (music) #Massless particle #Materials science #Monolayer #Nanotechnology #Overlayer #Physics #Quantum mechanics #Silicene #Topological Materials and Phenomena #cond-mat.mtrl-sci #physics.comp-ph
paper · pdf · doi:10.1103/physrevlett.118.096401
published as Phys. Rev. Lett. 118, 096401 (2017) · accepted for publication in Physical Review Letters
arxiv created 2017/02/02 · openalex publication_date 2017/03/02 · arxiv updated 2017/03/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Honeycomb structures of group IV elements can host massless Dirac fermions with nontrivial Berry phases. Their potential for electronic applications has attracted great interest and spurred a broad search for new Dirac materials especially in monolayer structures. We present a detailed investigation of the β12 sheet, which is a borophene structure that can form spontaneously on a Ag(111) surface. Our tight-binding analysis revealed that the lattice of the β12 sheet could be decomposed into two triangular sublattices in a way similar to that for a honeycomb lattice, thereby hosting Dirac cones. Furthermore, each Dirac cone could be split by introducing periodic perturbations representing overlayer-substrate interactions. These unusual electronic structures were confirmed by angle-resolved photoemission spectroscopy and validated by first-principles calculations. Our results suggest monolayer boron as a new platform for realizing novel high-speed low-dissipation devices.