Topological phase transition in Sb-dopedMg3Bi2monocrystalline thin films,Physical Review B

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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

{Mg}_{3} {Bi}_{2}

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

{Mg}_{3} {Bi}_{2}

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

{Mg}_{3} {Bi}_{2}

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