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.; Ricco, 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), pp. 106402-106407. [10.1103/PhysRevLett.124.106402]

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

Gibertini M.;
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.
124
10
106402
106407
Bulk and Surface Electronic Structure of the Dual-Topology Semimetal Pt2HgSe3 / Cucchi, I.; Marrazzo, A.; Cappelli, E.; Ricco, 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), pp. 106402-106407. [10.1103/PhysRevLett.124.106402]
Cucchi, I.; Marrazzo, A.; Cappelli, E.; Ricco, 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1200923
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