Details

Autor(en) / Beteiligte

• 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

Titel

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

Ist Teil von

• Physical review letters, 2020-03, Vol.124 (10), p.1

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2020

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• We report high-resolution angle-resolved photoemission measurements on single crystals of Pt2HgSe3 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.