期刊
NANO LETTERS
卷 20, 期 10, 页码 7186-7192出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c02520
关键词
Quantum anomalous Hall insulator; graphane; Tin; Magnetism
类别
资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division (first-principles calculations of the effect of substrates)
- Center for Nanophase Materials Sciences (investigation of the gas phase)
- Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) (effective Hamiltonian modeling) - Ministry of Science, ICT and Future Planning [NRF-2016M3D1A1919181]
We propose a new strategy to engineer topological and magnetic properties of two-dimensional (2D) hexagonal lattices consisting of post-transition metals. Our first-principles calculations demonstrate that substrates serve as templates to form 2D lattices with high thermodynamic stability, where their topological properties as well as magnetic properties sensitively change as a function of lattice constants, i.e., the system undergoes a first-order phase transition from nonmagnetic to ferromagnetic state above a critical lattice constant. Consequently, substrates can be used to explore versatile magnetic, electronic, and quantum topological properties. We establish phase diagrams of versatile quantum phases in terms of exchange coupling and spin-orbit coupling effectively tuned by the lattice constants. We further reveal the first room-temperature quantum anomalous Hall (QAH) effect, i.e., Sn on 2 root 3 x 2 root 3 graphane is a QAH insulator with a large spin-orbit coupling gap of similar to 0.2 eV and a Curie temperature of similar to 380 K by using the 2D anisotropic Heisenberg model.
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