Λεπτομέρειες βιβλιογραφικής εγγραφής
| Τίτλος: |
A Symmetry Strategy for Large Bandgap Quantum Anomalous Hall Insulators. |
| Συγγραφείς: |
Cai, Han1 (AUTHOR), Yao, Qiushi2 (AUTHOR), Li, Jiayu3 (AUTHOR) jyli93@hku.hk, Xuan, Xiaoyu1 (AUTHOR), Guo, Wanlin1 (AUTHOR), Zhang, Zhuhua1 (AUTHOR) chuwazhang@nuaa.edu.cn |
| Πηγή: |
Advanced Functional Materials. 7/16/2026, Vol. 36 Issue 57, p1-9. 9p. |
| Θεματικοί όροι: |
*Symmetry breaking, *Space groups, *Ab-initio calculations, *Topological insulators, *Band gaps |
| Περίληψη: |
Quantum anomalous Hall insulators (QAHIs) are an ideal platform for exploring exotic quantum phenomena, yet typically depend on strong relativistic effects to achieve a substantial bandgap. Here, we propose a symmetry‐lowering strategy for designing robust QAHIs without introducing heavy elements. Using the tetragonal space group as a prototypical system, we find that reducing symmetry from P4/nmm to Pmmn activates hybridization of distinct orbital sets near the Dirac cone, producing a large topological bandgap in correlated systems. First‐principles calculations identify the Pmmn VAs monolayer as a high‐temperature QAHI with a bandgap of 1018 meV, much larger than 857 meV of its P4/nmm counterpart. This strategy also facilitates bandgap engineering in QAHIs via symmetry manipulation, such as strain and substrate applications. [ABSTRACT FROM AUTHOR] |
| Βάση Δεδομένων: |
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