Bulk and Surface Electronic Structure of the Dual-Topology Semimetal Pt2HgSe3

Autor:	Irène Cucchi, Antimo Marrazzo, Timur K. Kim, Céline Besnard, Marco Gibertini, Anna Tamai, Edoardo Cappelli, Enrico Giannini, S. Riccò, Flavio Y. Bruno, Nicola Marzari, C. Cacho, Simone Lisi, Moritz Hoesch, Felix Baumberger
Rok vydání:	2020
Předmět:	Physics Surface (mathematics) Condensed matter physics General Physics and Astronomy Angle-resolved photoemission spectroscopy Electronic structure 01 natural sciences Brillouin zone Saddle point Topological insulator 0103 physical sciences Density of states 010306 general physics Surface states
Zdroj:	Physical Review Letters. 124
ISSN:	1079-7114 0031-9007
Popis:	We report high-resolution angle-resolved photoemission measurements on single crystals of Pt_{2}HgSe_{3} grown by high-pressure synthesis. Our data reveal a gapped Dirac nodal line whose (001) projection separates the surface Brillouin zone in topological and trivial areas. In the nontrivial k-space range, we find surface states with multiple saddle points in the dispersion, resulting in two van Hove singularities in the surface density of states. Based on density-functional theory calculations, we identify these surface states as signatures of a topological crystalline state, which coexists with a weak topological phase.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::98f60a8d76c4e3fb81224a116ff9f83a https://doi.org/10.1103/physrevlett.124.106402 Zobrazit plný text záznamu