Identifying,Resolving, and Quantifying Anisotropy in ReS2 Nanomechanical Resonators |
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Authors: | Bo Xu Jiankai Zhu Fei Xiao Chenyin Jiao Yachun Liang Ting Wen Song Wu Zejuan Zhang Lin Lin Shenghai Pei Hao Jia Ying Chen Ziming Ren Xueyong Wei Wen Huang Juan Xia Zenghui Wang |
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Affiliation: | 1. Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054 P. R. China;2. Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313001 P. R. China;3. State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050 P. R. China;4. State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, 710049 P. R. China |
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Abstract: | As an emerging two-dimensional semiconductor, rhenium disulfide (ReS2) is renowned for its strong in-plane anisotropy in electrical, optical, and thermal properties. In contrast to the electrical, optical, optoelectrical, and thermal anisotropies that are extensively studied in ReS2, experimental characterization of mechanical properties has largely remained elusive. Here, it is demonstrated that the dynamic response in ReS2 nanomechanical resonators can be leveraged to unambiguously resolve such disputes. Using anisotropic modal analysis, the parameter space for ReS2 resonators in which mechanical anisotropy is best manifested in resonant responses is determined. By measuring their dynamic response in both spectral and spatial domains using resonant nanomechanical spectromicroscopy, it is clearly shown that ReS2 crystal is mechanically anisotropic. Through fitting numerical models to experimental results, it is quantitatively determined that the in-plane Young's moduli are 127 and 201 GPa along the two orthogonal mechanical axes. In combination with polarized reflectance measurements, it is shown that the mechanical soft axis aligns with the Re-Re chain in the ReS2 crystal. These results demonstrate that dynamic responses in nanomechanical devices can offer important insights into intrinsic properties in 2D crystals and provide design guidelines for future nanodevices with anisotropic resonant responses. |
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Keywords: | anisotropy mechanical properties mode shapes nanomechanical resonator ReS2 |
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