2017/05/05 by Motohiko Ezawa · 45 citations
Chemistry · Materials Science · Mathematics · Physics and Astronomy · #2D Materials and Applications #Band gap #Chemistry #Condensed matter physics #Geometric phase #Geometry #Graphene research and applications #Line (geometry) #Mathematics #NODAL #Phase (matter) #Phase transition #Physics #Quantum mechanics #Semimetal #Topological Materials and Phenomena #Topology (electrical circuits) #Transition (genetics) #Weyl semimetal #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.96.041205
published in Physical review. B./Physical review. B 96(4) (American Physical Society) · 5 pages, 2 figures
arxiv created 2017/05/05 · openalex created_date 2017/05/12 · openalex publication_date 2017/07/21 · arxiv updated 2017/09/20 · openalex updated_date 2026/08/05
We propose a simple scheme to construct a model whose Fermi surface is comprised of crossing-line nodes. The Hamiltonian consists of a normal hopping term and an additional term which is odd under the mirror reflection. The line nodes appear along the mirror-invariant planes, where each line node carries the quantized Berry magnetic flux. We explicitly construct a model with the N-fold rotational symmetry, where the 2N line nodes merge at the north and south poles. When we apply photoirradiation along the kz axis, there emerge point nodes carrying the monopole charge \ifmmode±\else\textpm\fiN at these poles, while all the line nodes disappear. In this model, photoirradiation induces a topological phase transition from a crossing-line nodal semimetal to a multiple-Weyl semimetal, where the surface state turns from a drumhead state into a Fermi-arc state.