title: Multiple Coexisting Dirac Surface States in Three-Dimensional Topological Insulator PbBi₆Te₁₀.
abstract: By means of angle-resolved photoemission spectroscopy (ARPES) measurements, we unveil the electronic band structure of three-dimensional PbBi6Te10 topological insulator. ARPES investigations evidence multiple coexisting Dirac surface states at the zone-center of the reciprocal space, displaying distinct electronic band dispersion, different constant energy contours, and Dirac point energies. We also provide evidence of Rashba-like split states close to the Fermi level, and deeper M- and V-shaped bands coexisting with the topological surface states. The experimental findings are in agreement with scanning tunneling microscopy measurements revealing different surface terminations according to the crystal structure of PbBi6Te10. Our experimental results are supported by density functional theory calculations predicting multiple topological surface states according to different surface cleavage planes.
authors.affiliation: Dipartimento di Fisica, Università della Calabria , 87036 Arcavacata di Rende, Calabria, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Papagno
authors.affiliation: Institute of Strength Physics and Materials Science , 634021 Tomsk, Russia.|Tomsk State University , 634050 Tomsk, Russia.|Saint Petersburg State University , Saint Petersburg 198504, Russia.
authors.forename: Sergey V
authors.initials: SV
authors.lastname: Eremeev
authors.affiliation: CNR-IOM, TASC Laboratory, AREA Science Park Basovizza, 34149 Trieste, Italy.
authors.forename: Jun
authors.initials: J
authors.lastname: Fujii
authors.affiliation: Institute Catalysis and Inorganic Chemistry, Azerbaijan National Academy of Science , AZ1143 Baku, Azerbaijan.|Institute of Physics, Azerbaijan National Academy of Science , AZ1143 Baku, Azerbaijan.
authors.forename: Ziya S
authors.initials: ZS
authors.lastname: Aliev
authors.affiliation: Institute Catalysis and Inorganic Chemistry, Azerbaijan National Academy of Science , AZ1143 Baku, Azerbaijan.
authors.forename: Mahammad B
authors.initials: MB
authors.lastname: Babanly
authors.affiliation: Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy.
authors.forename: Sanjoy Kr
authors.initials: SK
authors.lastname: Mahatha
authors.affiliation: CNR-IOM, TASC Laboratory, AREA Science Park Basovizza, 34149 Trieste, Italy.
authors.forename: Ivana
authors.initials: I
authors.lastname: Vobornik
authors.affiliation: Institute of Physics, Azerbaijan National Academy of Science , AZ1143 Baku, Azerbaijan.
authors.forename: Nazim T
authors.initials: NT
authors.lastname: Mamedov
authors.affiliation: Dipartimento di Fisica, Università della Calabria , 87036 Arcavacata di Rende, Calabria, Italy.
authors.forename: Daniela
authors.initials: D
authors.lastname: Pacilé
authors.affiliation: Tomsk State University , 634050 Tomsk, Russia.|Saint Petersburg State University , Saint Petersburg 198504, Russia.|Donostia International Physics Center (DIPC), 20018 San Sebastián/Donostia, Basque Country, Spain.|Departamento de Física de Materiales UPV/EHU, Centro de Física de Materiales CFM-MPC and Centro Mixto CSIC-UPV/EHU, 20080 San Sebastián/Donostia, Basque Country, Spain.
authors.forename: Evgueni V
authors.initials: EV
authors.lastname: Chulkov
keywords: ARPES; DFT; Dirac surface states; STM; topological insulator