Bulk and surface electronic structure of the dual-topology semimetal Pt2HgSe3

DOI: 10.1103/PhysRevLett.124.106402

Authors: I. Cucchi (University of Geneva) , A. Marrazzo (École Polytechnique Fédérale de Lausanne) , E. Cappelli (University of Geneva) , S. Ricco (University of Geneva) , F. Y. Bruno (University of Geneva) , S. Lisi (University of Geneva) , M. Hoesch (Diamond Light Source; Deutsches Elektronen-Synchrotron DESY) , T. K. Kim (Diamond Light Source) , C. Cacho (Diamond Light Source) , C. Besnard (University of Geneva) , E. Giannini (University of Geneva) , N. Marzari (École Polytechnique Fédérale de Lausanne) , M. Gibertini (University of Geneva; École Polytechnique Fédérale de Lausanne) , F. Baumberger (University of Geneva; Swiss Light Source) , A. Tamai (University of Geneva)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 124

State: Published (Approved)
Published: February 2020
Diamond Proposal Number(s): 18952

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.

Journal Keywords: Surface states; Symmetry protected topological states; Topological materials; van Hove singularity; Van der Waals systems; Angle-resolved photoemission spectroscopy

Subject Areas: Physics, Materials


Instruments: I05-ARPES

Added On: 02/04/2020 14:24

Discipline Tags:

Surfaces Quantum Materials Physics Hard condensed matter - structures Materials Science

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES)