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Topological phase transition in Sb-dopedMg3Bi2monocrystalline thin films
Physical Review B ( IF 3.7 ) Pub Date : 2021-03-03 , DOI: 10.1103/physrevb.103.125405 Tong Zhou , Mingyu Tong , Yun Zhang , Xiangnan Xie , Zhen-Yu Wang , Tian Jiang , Xie-Gang Zhu , Xin-Chun Lai
Physical Review B ( IF 3.7 ) Pub Date : 2021-03-03 , DOI: 10.1103/physrevb.103.125405 Tong Zhou , Mingyu Tong , Yun Zhang , Xiangnan Xie , Zhen-Yu Wang , Tian Jiang , Xie-Gang Zhu , Xin-Chun Lai
has been proved to be a semimetal with topological surface states (referred to as a topological semimetal, TSM) in the presence of spin-orbit coupling (SOC), and predicted to be a type-II nodal line semimetal (NSM) in the absence of SOC. It is possible to tune the effective SOC in by substituting the heavy Bi atom with lighter atoms, such as Sb or As, which results in topological phase transitions. Here in our work we investigate the evolution of the transport properties and band structures of by doping different concentrations of Sb through molecular beam epitaxy. Our results demonstrate the existence of phase transitions of TSM to trivial semimetal (SM) and SM to trivial insulator, with Sb concentration at and , respectively. Further theoretical calculations give values of and , which agrees well with our experimental results. And all these results are concluded into a phase diagram. Our work will stimulate more explorations to the possibilities of the realization of type-II NSM in by various elements substitution.
更新日期:2021-03-03