تقرير
Unusual band evolution and persistence of topological surface states in high-T_C magnetic topological insulator
| العنوان: | Unusual band evolution and persistence of topological surface states in high-T_C magnetic topological insulator |
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| المؤلفون: | Hori, K., Souma, S., Chuang, C. -W., Nakata, Y., Nakayama, K., Gupta, S., Nguyen, T. P. T., Yamauchi, K., Takahashi, T., Matsukura, F., Chang, F. H., Lin, H. J., Chen, C. T., Chainani, A., Sato, T. |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Strongly Correlated Electrons |
| الوصف: | Understanding the mechanism of ferromagnetism in ferromagnetic topological insulators (TIs) is a key to realize exotic time-reversal-symmetry-broken quantum phases. However, electronic states relevant to the ferromagnetism are highly controversial. Here we report angle-resolved photoemission spectroscopy on (CrxSb1-x)2Te3 thin films, high-Curie-temperature (T_C) ferromagnetic TIs, spanning the non-doped (T_C=0 K) to highly-doped (T_C=192 K) region. We found that, upon Cr doping to Sb2Te3, the bulk valence-band valley exhibits filling-in behavior while retaining band inversion, leading to the formation of a nearly-flat band in high-T_C regime and evolution from a six-petal flower to a Star-of-David Fermi surface. Despite the weakening of spin-orbit coupling with Cr doping, the Dirac-cone state persists up to the highest-T_C sample, and shows a clear magnetic-gap opening below TC accompanied with an unexpected band shift, signifying its strong coupling with spontaneous ferromagnetism. The present result lays the foundation for understanding the interplay between band topology and ferromagnetism in TIs. Comment: 32 pages, 9 figures, 1 table |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2307.13388 |
| رقم الأكسشن: | edsarx.2307.13388 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |