Li Jie, Gu Lei, Wu Ruqian
Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA.
Nanoscale. 2020 Feb 14;12(6):3888-3893. doi: 10.1039/c9nr09817h. Epub 2020 Jan 30.
To explore new materials for the realization of the quantum anomalous Hall effect (QAHE), we studied the electronic, magnetic and topological properties of transition-metal phthalocyanine (TMPc) monolayers in a square lattice. Many of them have large topologically nontrivial band gaps and integer Chern numbers. In particular, the Fermi level of MoPc lies right in the band gap (E = 8.1 meV) and has large magnetic anisotropy energy (MAE = 2.0 meV per Mo atom) and a Curie temperature of 16 K, showing its usefulness for applications. The presence of the topologically protected edge state in a MoPc nanoribbon further confirms it as a new two-dimensional topological insulator. This much widens the search for QAHE materials for the design of quantum devices.
为了探索用于实现量子反常霍尔效应（QAHE）的新材料，我们研究了正方形晶格中过渡金属酞菁（TMPc）单层的电子、磁性和拓扑性质。其中许多材料具有较大的拓扑非平凡带隙和整数陈数。特别地，钼酞菁（MoPc）的费米能级恰好位于带隙中（E = 8.1毫电子伏特），并且具有较大的磁各向异性能量（每Mo原子MAE = 2.0毫电子伏特）和16 K的居里温度，显示出其应用价值。MoPc纳米带中拓扑保护边缘态的存在进一步证实了它是一种新型二维拓扑绝缘体。这大大拓宽了用于量子器件设计的QAHE材料的搜索范围。
