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In-plane optical anisotropy of two-dimensional VOCl single crystal with weak interlayer interaction |
| Ruijie Wang(王瑞洁)1,†, Qilong Cui(崔其龙)1,†, Wen Zhu(朱文)1,2,†, Yijie Niu(牛艺杰)3, Zhanfeng Liu(刘站锋)1, Lei Zhang(张雷)4, Xiaojun Wu(武晓君)3, Shuangming Chen(陈双明)1,‡, and Li Song(宋礼)1 |
1 National Synchrotron Radiation Laboratory, University of Science and Technology of China(USTC), Hefei 230029, China;
2 School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
3 Department of Materials Sciences and Engineering, School of Chemistry and Materials Sciences, University of Science and Technology of China, Hefei 230026, China;
4 School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China |
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Abstract Transition-metal oxyhalides $MOX$ ($M = {\rm Fe}$, Cr, V; $O ={\rm oxygen}$, $X= {\rm F}$, Cl, Br, I), an emerging type of two-dimensional (2D) van der Waals materials, have been both theoretically and experimentally demonstrated to possess unique electronic and magnetic properties. However, the intrinsic in-plane anisotropic properties of 2D VOCl still lacks in-depth research, especially optical anisotropy. Herein, a systematic Raman spectroscopic study is performed on VOCl single-crystal with different incident laser polarization at various temperatures. The polarized-dependent Raman scattering spectra reveal that the ${{ A}}_{{\rm g}}$ mode of VOCl show a 2-lobed shape in parallel polarization configuration while a 4-lobed shape in vertical configuration. In addition, the temperature-dependent and thickness-dependent Raman scattering spectra confirm a relatively weak van der Waals interaction between each layers among VOCl single crystal. These findings might provide better understanding on the in-plane anisotropic phenomenon in VOCl layers, thus will accelate further application of 2D single crystals for nanoscale angle-dependent optoelectronics.
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Received: 25 April 2022
Revised: 30 May 2022
Accepted manuscript online: 02 June 2022
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PACS:
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68.65.-k
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(Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties)
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78.67.-n
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(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
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78.30.-j
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(Infrared and Raman spectra)
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| Fund: Project financially supported by National Natural Science Foundation of China (Grant No. U1932201), the International Partnership Program (Grant No. 211134KYSB20190063), the CAS (Chinese Academy of Sciences) Collaborative Innovation Program of Hefei Science Center (Grant No. 2020HSCCIP002), the University Synergy Innovation Program of Anhui Province, China (Grant No. GXXT-2020-002), the Youth Innovation Promotion Association of CAS (Grant No. 2022457), and the USTC Research Funds of the Double First-Class Initiative (YD2310002004). |
Corresponding Authors:
Shuangming Chen
E-mail: csmp@ustc.edu.cn
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Cite this article:
Ruijie Wang(王瑞洁), Qilong Cui(崔其龙), Wen Zhu(朱文), Yijie Niu(牛艺杰), Zhanfeng Liu(刘站锋), Lei Zhang(张雷), Xiaojun Wu(武晓君), Shuangming Chen(陈双明), and Li Song(宋礼) In-plane optical anisotropy of two-dimensional VOCl single crystal with weak interlayer interaction 2022 Chin. Phys. B 31 096802
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