High-Chern-number and high-temperature quantum Hall effect without Landau levels  

作　　者：Jun Ge Yanzhao Liu Jiaheng Li Hao Li Tianchuang Luo Yang Wu Yong Xu Jian Wang 

机构地区：[1]Intematiorial Center for Quantum Materials,School of Physics.Peking Universi ty,Beijing 100871,China [2]State Key Laboratory of Low Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing 100084.China [3]School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [4]Tsinghua-Foxconn Nanotechnology Research Center and Department of Physics,Tsinghua University,Beijing 100084,China [5]Department of Mechanical Engineemig,Tsinghua University,Beijing 100084,China [6]Frontier Science Center for Quantum Information,Beijing 100084,China [7]RIKEN Center for Emergent Matter Science(CEMS),Wako,Saitama 351-0198,Japan [8]Collaboraiive Innovation Centei of Quantum Mattei,Beijing 100871.China [9]CAS Centei for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100190,China [10]Beijing Academy of Quantum Information Sciences,Beijing 100193,China

出　　处：《National Science Review》2020年第8期1280-1287,共8页国家科学评论（英文版）

摘　　要：The quantum Hall effect(QHE)with quantized Hall resistance ofh/ve2 started the research on topological quantum states and laid the foundation of topology in physics.Since then,Haldane proposed the QHE without Landau levels,showing nonzero Chern number|C|=1,which has been experimentally observed at relatively low temperatures.For emerging physics and low-power-consumption electronics;the key issues are how to increase the working temperature and realize high Chern numbers(C>1).Here,we report the experimental discovery of high-Chern-number QHE(C=2)without Landau levels and C=1 Chern insulator state displaying a nearly quantized Hall resistance plateau above the Neel temperature in MnBi2Te4 devices.Our observations provide a new perspective on topological matter and open new avenues for exploration of exotic topological quantum states and topological phase transitions at higher temperatures.

关 键 词：quantum Hall effect without Landau levels Chern insulator topological matter topological quantum states high Chern number high temperature 

分 类 号：O469[理学—凝聚态物理]