تقرير
Detection of Weyl Fermions and the Metal to Weyl-Semimetal phase transition in WTe$_2$ via broadband High Resolution NMR
| العنوان: | Detection of Weyl Fermions and the Metal to Weyl-Semimetal phase transition in WTe$_2$ via broadband High Resolution NMR |
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| المؤلفون: | Papawassiliou, Wassilios, Carvalho, José P., Kim, Hae Jin, Kim, Chang-Yeon, Yoo, Seung Jo, Lee, Jin Bae, Alhassan, Saeed, Orfanidis, Savvas, Psycharis, Vassilios, Karagianni, Marina, Fardis, Michael, Panopoulos, Nikolaos, Papavassiliou, Georgios, Pell, Andrew J. |
| سنة النشر: | 2021 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science |
| الوصف: | Weyl Fermions (WFs) in the type-II Weyl Semimetal (WSM) WTe$_2$ are difficult to resolve experimentally because the Weyl bands disperse in an extremely narrow region of the (E-k) space. Here, by using DFT-assisted high-resolution $^{125}$Te solid-state NMR (ssNMR) in the temperature range $50$K - $700$K, we succeeded in detecting low energy WF excitations and monitor their evolution with temperature. Remarkably, WFs appear to emerge at T$\sim 120$K; at lower temperatures WTe$_2$ behaves as a metal. This intriguing metal-to-WSM phase transition is shown to be induced by the rapid raise of the Fermi level with temperature, crossing solely the electron and hole pockets in the low-T metallic phase, while crossing the Weyl bands near the nodal points - a prerequisite for the emergence of WFs - only for T$>120$K. Comment: 23 pages (5 main article, 18 supplementary material), 16 figures (4 main article, 12 supplementary material), 1 table (supplementary material) |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2110.01300 |
| رقم الأكسشن: | edsarx.2110.01300 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |