Bulk and surface band structure of the new family of semiconductors BiTeX (X=I, Br, Cl)

• Published in: Journal of electron spectroscopy and related phenomena Vol. 201; no. C; pp. 115 - 120
• Main Authors: Moreschini, L., Autès, G., Crepaldi, A., Moser, S., Johannsen, J.C., Kim, K.S., Berger, H., Bugnon, Ph, Magrez, A., Denlinger, J., Rotenberg, E., Bostwick, A., Yazyev, O.V., Grioni, M.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01-05-2015; Elsevier
• Subjects: Angle-resolved photoemission; Rashba states; Spin–orbit splitting; Tellurohalides; Angle-resolved photoemission; Spin–orbit splitting; Tellurohalides; Rashba states
• ISSN: 0368-2048; 1873-2526
• DOI: 10.1016/j.elspec.2014.11.004

•We provide an ARPES comparison between the three tellurohalides BiTeX (X=I, Br, Cl).•They present a similar band structure with namely spin-split bulk and surface states.•They offer, except for BiTeCl, the possibility of ambipolar conduction.•They can be easily doped.•From the data appeared so far, BiTeBr may be the most appealing for applications.
We present an overview of the new family of semiconductors BiTeX (X=I, Br, Cl) from the perspective of angle resolved photoemission spectroscopy. The strong band bending occurring at the surface potentially endows them with a large flexibility, as they are capable of hosting both hole and electron conduction, and can be modified by inclusion or adsorption of foreign atoms. In addition, their trigonal crystal structure lacks a center of symmetry and allows for both bulk and surface spin-split bands at the Fermi level. We elucidate analogies and differences among the three materials, also in the light of recent theoretical and experimental work.