Discovery of intrinsic quantum anomalous Hall effect in organic Mn-DCA lattice

被引：70

作者：

Wang, Ya-ping ^{[1
,2
]}

Ji, Wei-xiao ^{[1
]}

Zhang, Chang-wen ^{[1
]}

Li, Ping ^{[1
]}

Wang, Pei-ji ^{[1
]}

Kong, Biao ^{[2
]}

Li, Sheng-shi ^{[3
]}

Yan, Shi-shen ^{[3
]}

Liang, Kang ^{[4
]}

机构：

[1] Univ Jinan, Sch Phys & Technol, Jinan 250022, Shandong, Peoples R China

[2] Fudan Univ, iChEM, Shanghai Key Lab Mol Catalysis & Innovat Mat, Dept Chem, Shanghai 200433, Peoples R China

[3] Shandong Univ, State Key Lab Crystal Mat, Sch Phys, Jinan 250100, Shandong, Peoples R China

[4] Univ New South Wales, Sch Chem Engn, Sydney, NSW 2052, Australia

来源：

APPLIED PHYSICS LETTERS | 2017年 / 110卷 / 23期

基金：

中国国家自然科学基金;

关键词：

TOPOLOGICAL INSULATORS; COORDINATION NETWORK; FRAMEWORKS;

D O I：

10.1063/1.4985144

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The quantum anomalous Hall (QAH) phase is a topological state of matter characterized by a nonzero quantized Hall conductivity without an external magnetic field. The realizations of the QAH effect, however, are experimentally challengeable. Based on ab initio calculations, here, we propose an intrinsic QAH phase in the Mn-dicyanoanthracene (DCA) Kagome lattice. The nontrivial topology in Kagome bands is confirmed by the nonzero Chern number, quantized Hall conductivity, and gapless chiral edge states of the Mn-DCA lattice. A tight-binding model is further constructed to clarify the origin of the QAH effect. Furthermore, its Curie temperature, estimated to be similar to 253K using the Monte-Carlo simulation, is comparable with room temperature and higher than that of most of the two-dimensional ferromagnetic thin films. Our findings present a reliable material platform for the observation of the QAH effect in covalent-organic frameworks. Published by AIP Publishing.

引用

页数：5

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