@article{Liang2025, 
author = {Yachun Liang and Luming Wang and Song Wu and Jiaqi Wu and Jiankai Zhu and Jiaze Qin and Xiulian Fan and Zejuan Zhang and Bo Xu and Chenyin Jiao and Shenghai Pei and Yu Zhou and Juan Xia and Zenghui Wang},
title = {Tunable anisotropy in wide-bandgap 2D crystal CaNb2O6 utilizing nanomechanical resonators},
year = {2025},
journal = {International Journal of Extreme Manufacturing},
volume = {7},
number = {4},
keywords = {anisotropy, wide-bandgap materials, nanomechanical resonators, 2D crystal},
url = {https://www.sciopen.com/article/10.1088/2631-7990/adba1d},
doi = {10.1088/2631-7990/adba1d},
abstract = {As an ultrathin wide-bandgap (WBG) material, CaNb2O6 exhibits excellent optical and electrical properties. Particularly, its highly asymmetric crystal structure provides new opportunities for designing novel nanodevices with directional functionality. However, due to the significant challenges in applying conventional techniques to nanoscale samples, the in-plane anisotropy of CaNb2O6 has still remained unexplored. Here, we leverage the resonant nanoelectromechanical systems (NEMS) platform to successfully quantify both the mechanical and thermal anisotropies in such an ultrathin WBG crystal. Specifically, by measuring the dynamic response in both spectral and spatial domains, we determine the anisotropic Young’s modulus of CaNb2O6 as EY(a) = 70.42 GPa and EY(b) = 116.2 GPa. By further expanding this technique to cryogenic temperatures, we unveil the anisotropy in thermal expansion coefficients as α(a) = 13.4 ppm·K−1, α(b) = 2.9 ppm·K−1. Interestingly, through thermal strain engineering, we successfully modulate the mode sequence and achieve a crossing of (1 × 2)-(2 × 1) modes with perfect degeneracy. Our study provides guidelines for future CaNb2O6 nanodevices with additional degrees of freedom and new device functions.}
}