Tailoring of Bandgap and Spin-Orbit Splitting in ZrSe$_{2}$ with Low Substitution of Ti for Zr
Sheng Wang1†, Zia ur Rehman2†, Zhanfeng Liu1, Tongrui Li1, Yuliang Li1, Yunbo Wu1, Hongen Zhu1, Shengtao Cui1, Yi Liu1, Guobin Zhang1, Li Song1*, and Zhe Sun1*
1National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China 2Nanoscale Synthesis & Research Laboratory, Department of Applied Physics, University of Karachi, Karachi-75270, Pakistan
Abstract：Tuning the bandgap in layered transition metal dichalcogenides (TMDCs) is crucial for their versatile applications in many fields. The ternary formation is a viable method to tune the bandgap as well as other intrinsic properties of TMDCs, because the multi-elemental characteristics provide additional tunability at the atomic level and advantageously alter the physical properties of TMDCs. Herein, ternary Ti$_{x}$Zr$_{1-x}$Se$_{2}$ single crystals were synthesized using the chemical-vapor-transport method. The changes in electronic structures of ZrSe$_{2}$ induced by Ti substitution were revealed using angle-resolved photoemission spectroscopy. Our data show that at a low level of Ti substitution, the bandgap of Ti$_{x}$Zr$_{1-x}$Se$_{2}$ decreases monotonically, and the electronic system undergoes a transition from a semiconducting to a metallic state without a significant variation of dispersions of valence bands. Meanwhile, the size of spin-orbit splitting dominated by Se $4p$ orbitals decreases with the increase of Ti doping. Our work shows a convenient way to alter the bandgap and spin-orbit coupling in TMDCs at the low level of substitution of transition metals.
(Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)
引用本文:
. [J]. 中国物理快报, 2022, 39(7): 77102-.
Sheng Wang, Zia ur Rehman, Zhanfeng Liu, Tongrui Li, Yuliang Li, Yunbo Wu, Hongen Zhu, Shengtao Cui, Yi Liu, Guobin Zhang, Li Song, and Zhe Sun. Tailoring of Bandgap and Spin-Orbit Splitting in ZrSe$_{2}$ with Low Substitution of Ti for Zr. Chin. Phys. Lett., 2022, 39(7): 77102-.
2022, Vol. 39 
