Valley-Polarized Topological Phases with In-Plane Magnetization
The coexistence of valley polarization and topology has considerably facilitated the applications of 2D materials toward valleytronics device technology. However, isolated and distinct valleys are required to observe the valley-related quantum phenomenon. Herein, we report a new mechanism to generate in-plane magnetization direction-dependent isolated valley carriers by preserving or breaking the mirror symmetry in a 2D system. First-principle calculations are carried out on a prototype material, W<sub>2</sub>MnC<sub>2</sub>O<sub>2</sub> MXene, to demonstrate the mechanism. A valley-coupled topological phase transition among Weyl semimetal, valley-polarized quantum anomalous Hall insulator, and topological semimetal is observed by manipulating the in-plane magnetization directions in W<sub>2</sub>MnC<sub>2</sub>O<sub>2</sub>. Monte Carlo simulations of W<sub>2</sub>MnC<sub>2</sub>O<sub>2</sub> show that the estimated Curie temperature is around 170 K, indicating the possibility of observing valley-polarized topological states at higher temperatures. Our finding provides a generalized platform for investigating the valley and topological physics, which is extremely important for future quantum information processing applications.
Authors
- Ranjan Kumar Barik (ORCID: https://orcid.org/0000-0002-0639-4130)
- Mohammad Khazaei (ORCID: https://orcid.org/0000-0001-5093-1610)
- Ahmad Ranjbar (ORCID: https://orcid.org/0000-0002-6381-3135)
- Kaoru Ohno (ORCID: https://orcid.org/0000-0002-1980-5971)
- Yoshiyuki Kawazoe (ORCID: https://orcid.org/0000-0002-2369-7045)
- Abhishek Kumar Singh (ORCID: https://orcid.org/0000-0002-7631-6744)
- Seiji Yunoki (ORCID: https://orcid.org/0000-0002-8167-452X)
- Yan Sun (ORCID: https://orcid.org/0000-0002-7142-8552)
- Teck Leong Tan (ORCID: https://orcid.org/0000-0002-7089-8966)
- Yunye Liang (ORCID: https://orcid.org/0000-0002-4843-4196)
- Subhendu Mishra
- Shiyao Wang
- Junjie Wang (ORCID: https://orcid.org/0009-0001-9328-5863)
Institutions
- Agency for Science, Technology and Research (SG)
- Northwestern Polytechnical University (CN)
- Yokohama National University (JP)
- Chinese Academy of Sciences (CN)
- Tohoku University (JP)
- Shanghai Normal University (CN)
- University of Tehran (IR)
- Institute of High Performance Computing (SG)
- RIKEN Center for Computational Science (JP)
- Indian Institute of Science Bangalore (IN)
- Technische Universität Dresden (DE)
Publication Details
- Journal
- Nano Letters
- Published
- 2024-10-08
- DOI
- https://doi.org/10.1021/acs.nanolett.4c03252
- Citations
- 13
- Primary Topic
- 2D Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 1.52
Funders
- Department of Science and Technology, Ministry of Science and Technology, India
- Iran National Science Foundation
- Ministry of Education, India