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.
Bulk and Surface Electronic Structure of the Dual-Topology Semimetal Pt2HgSe3 / Cucchi, I.; Marrazzo, A.; Cappelli, E.; Riccò, S.; Bruno, F. Y.; Lisi, S.; Hoesch, M.; Kim, T. K.; Cacho, C.; Besnard, C.; Giannini, E.; Marzari, N.; Gibertini, M.; Baumberger, F.; Tamai, A.. - In: PHYSICAL REVIEW LETTERS. - ISSN 1079-7114. - 124:10(2020). [10.1103/physrevlett.124.106402]
Bulk and Surface Electronic Structure of the Dual-Topology Semimetal Pt2HgSe3
A. Marrazzo;
2020-01-01
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
