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Published on: August 2, 2019
Functionalization induced quantum spin Hall to quantum anomalous Hall phase transition in monolayer jacutingaite
Fangxue Luo1, Xiamin Hao1, Yizhen Jia1
1School of Physics, Beihang University, Beijing 100191, P. R. China. mzhou@buaa.edu.cn.
Chemical functionalization transforms jacutingaite into a quantum anomalous Hall (QAH) insulator. This breakthrough offers a new platform for topological quantum computing and dissipationless transport applications.
Area of Science:
- Condensed matter physics
- Materials science
- Quantum chemistry
Background:
- Quantum spin Hall (QSH) and quantum anomalous Hall (QAH) states represent novel quantum matter.
- Monolayer jacutingaite (Pt2HgSe3) was previously identified as a large-gap QSH insulator.
Purpose of the Study:
- To demonstrate a quantum spin Hall (QSH) to quantum anomalous Hall (QAH) phase transition in jacutingaite via chemical functionalization.
- To explore the potential of functionalized jacutingaite for exotic topological phases.
Main Methods:
- First-principles calculations
- Tight-binding modeling
- Chemical functionalization with chalcogens (S, Se, Te)
Main Results:
- Two-dimensional (2D) chalcogenated jacutingaite (Pt2HgSe3-X) exhibits ferromagnetism with a Curie temperature up to 316 K.
- The functionalized material displays the quantum anomalous Hall (QAH) effect with chiral edge states within a significant topological gap.
- The topological gap size is tunable by the spin-orbit coupling strength of the chalcogen, reaching 0.28 eV for Pt2HgSe3-Te.
Conclusions:
- Chemical functionalization is a viable strategy for orbital-engineering 2D materials.
- Functionalized jacutingaite provides a promising platform for realizing exotic topological phases.
- This research opens avenues for dissipationless transport and quantum computing applications.
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