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Anomalous behavior of the electronic structure of ( Bi1-xInx)2Se3 across the quantum phase transition from topological to trivial insulatorстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 16 января 2019 г.
- Авторы: Sánchez-Barriga J., Aguilera I., Yashina L.V., Tsukanova D.Y., Freyse F., Chaika A.N., Callaert C., Abakumov A.M., Hadermann J., Varykhalov A., Rienks E.D.L, Bihlmayer G., Blügel S., Rader O.
- Журнал: Physical Review B
- Том: 98
- Номер: 23
- Год издания: 2018
- Издательство: American Physical Society
- Местоположение издательства: United States
- Первая страница: 235110
- DOI: 10.1103/physrevb.98.235110
- Аннотация: Using spin- and angle-resolved photoemission spectroscopy and relativistic many-body calculations, we investigate the evolution of the electronic structure of (Bi1−x Inx )2 Se3 bulk single crystals around the critical point of the trivial to topological insulator quantum-phase transition. By increasing x, we observe how a surface gap opens at the Dirac point of the initially gapless topological surface state of Bi2Se3, leading to the existence of massive fermions. The surface gap monotonically increases for a wide range of x values across the topological and trivial sides of the quantum-phase transition. By means of photon-energy-dependent measurements, we demonstrate that the gapped surface state survives the inversion of the bulk bands which occurs at a critical point near x = 0.055. The surface state exhibits a nonzero in-plane spin polarization which decays exponentially with increasing x, and which persists in both the topological and trivial insulator phases. Our calculations reveal qual- itative agreement with the experimental results all across the quantum-phase transition upon the systematic vari- ation of the spin-orbit coupling strength. A non-time-reversal symmetry-breaking mechanism of bulk-mediated scattering processes that increase with decreasing spin-orbit coupling strength is proposed as explanation.
- Добавил в систему: Яшина Лада Валерьевна