摘要
Recently,natural van der Waals heterostructures of(MnBi2 Te4)m(Bi2 Te3)n have been theoretically predicted and experimentally shown to host tunable magnetic properties and topologically nontrivial surface states.We systematically investigate both the structural and electronic responses of MnBi2 Te4 and MnBi4 Te7 to external pressure.In addition to the suppression of antiferromagnetic order,MnBi2 Te4 is found to undergo a metalsemiconductor-metal transition upon compression.The resistivity of MnBi4 Te7 changes dramatically under high pressure and a non-monotonic evolution of p(T)is observed.The nontrivial topology is proved to persist before the structural phase transition observed in the high-pressure regime.We find that the bulk and surface states respond differently to pressure,which is consistent with the non-monotonic change of the resistivity.Interestingly,a pressure-induced amorphous state is observed in MnBi2 Te4,while two high-pressure phase transitions are revealed in MnBi4 Te7.Our combined theoretical and experimental research establishes MnBi2 Te4 and MnBi4 Te7 as highly tunable magnetic topological insulators,in which phase transitions and new ground states emerge upon compression.
作者
Cuiying Pei
Yunyouyou Xia
Jiazhen Wu
Yi Zhao
Lingling Gao
Tianping Ying
Bo Gao
Nana Li
Wenge Yang
Dongzhou Zhang
Huiyang Gou
Yulin Chen
Hideo Hosono
Gang Li
Yanpeng Qi
裴翠颖;夏云悠悠;邬家臻;赵毅;高玲玲;应天平;高波;李娜娜;杨文革;张东舟;缑慧阳;陈宇林;细野秀雄;李刚;齐彦鹏(School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;Materials Research Center for Element Strategy,Tokyo Institute of Technology,Yokohama 226-8503,Japan;Center for High Pressure Science and Technology Advanced Research(HPSTAR),Shanghai 201203,China;Hawai’i Institute of Geophysics and Planetology,School of Ocean and Earth Science and Technology,University of Hawai’i at Manoa,Honolulu,Hawaii 96822,USA;Department of Physics,Clarendon Laboratory,University of Oxford,Oxford 0X13PU,UK;ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 200031,China)
基金
Supported by the National Key Research and Development Program of China under Grant Nos.2018YFA0704300 and2017YFE0131300
the National Natural Science Foundation of China under Grant Nos.U1932217,11974246,11874263 and10225417
the Natural Science Foundation of Shanghai under Grant No.19ZR1477300
the support from Analytical Instrumentation Center(SPST-AIC10112914),SPST,ShanghaiTech Universitysupported by Collaborative Research Project of Materials and Structures Laboratory,Tokyo Institute of Technology,Japan,Part of this research is supported by COMPRES(NSF Cooperative Agreement EAR-1661511)。
