文献类型：期刊文献

英文题名：Predicted Quantum Topological Hall Effect and Noncoplanar Antiferromagnetism in K0.5RhO2

作者：Zhou, Jian[1,2];Liang, Qi-Feng[3];Weng, Hongming[4,5];Chen, Y. B.[1,6];Yao, Shu-Hua[1,2];Chen, Yan-Feng[1,2,7];Dong, Jinming[1,6];Guo, Guang-Yu[8,9]

机构：[1]Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China;[2]Nanjing Univ, Dept Mat Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China;[3]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China;[4]Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China;[5]Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China;[6]Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China;[7]Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China;[8]Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan;[9]Natl Ctr Theoret Sci, Div Phys, Hsinchu 30013, Taiwan

年份：2016

卷号：116

期号：25

外文期刊名：PHYSICAL REVIEW LETTERS

收录：SCI-EXPANDED(收录号：WOS:000378208800005)、、WOS

基金：This work is supported by the National Basic Research Program of China (2015CB659400 and 2013CB632700), the National Natural Science Foundation of China (No. 11474150, No. 11574215, No. 11274359, and No. 11422428) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China as well as the Ministry of Science and Technology, National Center for Theoretical Sciences and Academia Sinica in Taiwan.

语种：英文

外文关键词：Antiferromagnetism - Calculations - Energy gap - Potassium compounds - Rhodium compounds - Spin Hall effect - Spin orbit coupling - Topology

外文摘要：The quantum anomalous Hall (QAH) phase is a two-dimensional bulk ferromagnetic insulator with a nonzero Chern number in the presence of spin-orbit coupling (SOC) but in the absence of applied magnetic fields. Associated metallic chiral edge states host dissipationless current transport in electronic devices. This intriguing QAH phase has recently been observed in magnetic impurity-doped topological insulators, albeit, at extremely low temperatures. Based on first-principles density functional calculations, here we predict that layered rhodium oxide K0.5RhO2 in the noncoplanar chiral antiferromagnetic state is an unconventional three-dimensional QAH insulator with a large band gap and a Neel temperature of a few tens of Kelvins. Furthermore, this unconventional QAH phase is revealed to be the exotic quantum topological Hall effect caused by nonzero scalar spin chirality due to the topological spin structure in the system and without the need of net magnetization and SOC.