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http://hdl.handle.net/11452/34025
Başlık: | Origin of the temperature dependence of the energy gap in Cr-doped Bi2Se3 |
Yazarlar: | Hines, William Alraddadi, Shoroog Budnick, Joseph I. Sinkovic, Boris Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü. 0000-0002-6735-8088 0000-0001-7571-0937 Yılmaz, Turgut IQS-3983-2023 S-1198-2017 57193498321 |
Anahtar kelimeler: | Chemistry Physics Magnetic topological insulator Phase-transition Surface Photoemission Film Xps |
Yayın Tarihi: | 7-Nis-2018 |
Yayıncı: | Royal Soc Chemistry |
Atıf: | Yılmaz, T. vd. (2018). ''Origin of the temperature dependence of the energy gap in Cr-doped Bi2Se3''. Physical Chemistry Chemical Physics, 20(13), 8624-8628. |
Özet: | Recent progress in impurity-doped topological insulators has shown that the gap at the Dirac point shrinks with reducing temperature. This is an obstacle for experimental realization of the quantum anomalous Hall effect at higher temperature due to the requirement of a larger energy gap. In order to solve this puzzle, we study the gap at the Dirac point by performing temperature-dependent photoemission spectroscopy and X-ray diffraction experiments in Cr-doped Bi2Se3. Our valence band photoemission study revealed that the gap alters with temperature due to residual gas condensation on the sample surface with cooling. Residual gas on the sample surface creates an electron doping effect that modifies the chemical potential of the system resulting in the change of the gap size with variable temperature. Furthermore, such electron doping can weaken the ferromagnetism and lead to a bulk band contribution in the transport measurements. Therefore, such effects can hinder the existence of the quantum anomalous Hall state at higher temperatures. Hence, this work can pave the way for future studies towards a high-temperature quantum anomalous Hall effect. |
URI: | https://doi.org/10.1039/c7cp08049b https://pubs.rsc.org/en/content/articlelanding/2018/CP/C7CP08049B http://hdl.handle.net/11452/34025 |
ISSN: | 1463-9076 1463-9084 |
Koleksiyonlarda Görünür: | Scopus Web of Science |
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