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Rapid surface oxidation of Sb2Te3 as indication for a universal trend in the chemical reactivity of tetradymite topological insulatorsстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Volykhov A., Sánchez-Barriga J., Sirotina A., Neudachina V., Frolov A., Gerber E., Kataev E., Senkovskiy B., Khmelevsky N., Aksenenko A., Korobova N., Knop-Gericke A.Rader O, Yashina L.
- Журнал: Chemistry of Materials
- Год издания: 2016
- Издательство: American Chemical Society
- Местоположение издательства: United States
- DOI: 10.1021/acs.chemmater.6b03325
- Аннотация: Within the past few years, topological insulators(TIs) have attracted a lot of interest due to their uniqueelectronic structure with spin-polarized topological surfacestates (TSSs), which may pave the way for these materials tohave a great potential in multiple applications. However, toenable consideration of TIs as building blocks for noveldevices, stability of TSSs toward oxidation should be tested.Among the family of TIs with a tetradymite structure, Sb2Te3is of p-type and appears to be the least explored material sinceits TSS is unoccupied in the ground state, a property thatallows the use of optical excitations to generate spin currentsrelevant for spintronics. Here, we report relatively fast surface oxidation of Sb2Te3 under ambient conditions. We show that the clean surface reacts rapidly with molecular oxygen and slowly with water, and that humidity plays an important role during oxide layer growth. In humid air, we show that Sb2Te3 oxidizes on a time scale of minutes to hours, and much faster than other tetradymite TIs. The high surface reactivity revealed by our experiments is of critical importance and must be taken into account for the production and exploitation of novel TI-based devices using Sb2Te3 as a working material. Our results contribute to the comprehensive understanding of the universal trend underlying the chemical reactivity of tetradymite TIs.
- Добавил в систему: Яшина Лада Валерьевна