Tailoring of Bandgap and Spin-Orbit Splitting in ZrSe_(2) with Low Substitution of Ti for Zr  

作　　者：Sheng Wang Zia ur Rehman Zhanfeng Liu Tongrui Li Yuliang Li Yunbo Wu Hongen Zhu Shengtao Cui Yi Liu Guobin Zhang Li Song Zhe Sun 王盛;Zia ur Rehman;刘站锋;李彤瑞;李昱良;吴云波;朱红恩;崔胜涛;刘毅;张国斌;宋礼;孙喆(National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China;Nanoscale Synthesis&Research Laboratory,Department of Applied Physics,University of Karachi,Karachi-75270,Pakistan)

机构地区：[1]National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China [2]Nanoscale Synthesis&Research Laboratory,Department of Applied Physics,University of Karachi,Karachi-75270,Pakistan

出　　处：《Chinese Physics Letters》2022年第7期69-73,共5页中国物理快报（英文版）

基　　金：supported by the National Key R&D Program of China (Grant No. 2017YFA0402901);the National Natural Science Foundation of China (Grant No. U2032153);the International Partnership Program (Grant No. 211134KYSB20190063);the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB25000000);the USTC Research Funds of the Double First-Class Initiative (Grant No. YD2310002004)。

摘　　要：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.

关 键 词：RED Tailoring of Bandgap and Spin-Orbit Splitting in ZrSe_(2)with Low Substitution of Ti for Zr 

分 类 号：O469[理学—凝聚态物理]