| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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
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| Cite this article: |
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Sheng Wang, Zia ur Rehman, Zhanfeng Liu et al 2022 Chin. Phys. Lett. 39 077102 |
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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.
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Received: 13 April 2022
Published: 27 June 2022
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| PACS: |
71.20.-b
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(Electron density of states and band structure of crystalline solids)
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71.20.Nr
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(Semiconductor compounds)
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71.30.+h
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(Metal-insulator transitions and other electronic transitions)
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71.70.Ej
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(Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)
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