تقرير
Valley-Layer Coupling: A New Design Principle for Valleytronics
| العنوان: | Valley-Layer Coupling: A New Design Principle for Valleytronics |
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| المؤلفون: | Yu, Zhi-Ming, Guan, Shan, Sheng, Xian-Lei, Gao, Weibo, Yang, Shengyuan A. |
| المصدر: | Phys. Rev. Lett. 124, 037701 (2020) |
| سنة النشر: | 2019 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science |
| الوصف: | We introduce the concept of valley-layer coupling (VLC) in two-dimensional materials, where the low-energy electronic states in the emergent valleys have valley-contrasted layer polarization such that each state is spatially localized on the top or bottom super-layer. The VLC enables a direct coupling between valley and gate electric field, opening a new route towards electrically controlled valleytronics. We analyze the symmetry requirements for the system to host VLC, demonstrate our idea via first-principles calculations and model analysis of a concrete 2D material example, and show that an electric, continuous, wide-range, and switchable control of valley polarization can be achieved by VLC. Furthermore, we find that systems with VLC can exhibit other interesting physics, such as valley-contrasting linear dichroism and optical selection of the electric polarization of interlayer excitons. Comment: 6 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.124.037701 |
| الوصول الحر: | http://arxiv.org/abs/1904.06498Test |
| رقم الانضمام: | edsarx.1904.06498 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.124.037701 |
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