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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)