Deep Insight Into the Electronic Structure of Ternary Topological Insulators: A Comparative Study of PbBi4Te7 and PbBi6Te10

Pacilè, D.; Eremeev, S.V.; Caputo, M.; Pisarra, M.; De Luca, O.; Grimaldi, I.; Fujii, J.; Aliev, Z.S.; Babanlı , Məhəmməd; Vobornik, I.; Agostino, R.G.; Goldoni, A.; Chulkov, V.; Papagno, M.

doi:10.1002/pssr.201800341

Deep Insight Into the Electronic Structure of Ternary Topological Insulators: A Comparative Study of PbBi4Te7 and PbBi6Te10

Pacilè D., Eremeev S., Caputo M., Pisarra M., De Luca O., Grimaldi I., ...daha çox

Physica Status Solidi - Rapid Research Letters, vol.12, no.12, 2018 (SCI-Expanded, Scopus)

Nəşrin Növü: Article / Letter
Cild: 12 Say: 12
Nəşr tarixi: 2018
Doi nömrəsi: 10.1002/pssr.201800341
jurnalın adı: Physica Status Solidi - Rapid Research Letters
Jurnalın baxıldığı indekslər: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Açar sözlər: density functional theory, electronic structure, photoemission, scanning tunneling microscopy, topological insulators
Adres: Bəli

Qısa məlumat

By means of angle-resolved photoemission spectroscopy measurements, the electronic band structure of the three-dimensional PbBi4Te7 and PbBi6Te10 topological insulators is compared. The measurements clearly reveal coexisting topological and multiple Rashba-like split states close to the Fermi level for both systems. The observed topological states derive from different surface terminations, as confirmed by scanning tunneling microscopy measurements, and are well-described by the density functional theory simulations. Both the topological and the Rashba-like states reveal a prevalent two-dimensional character barely affected by air exposure. X-ray and valence band photoemission measurements suggest Rashba-like states stem from the van der Waals gap expansion, consistently with density functional theory calculations.