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9 results on '"Lv, Le"'

4. Surface Modification Using Polydopamine-Coated Liquid Metal Nanocapsules for Improving Performance of Graphene Paper-Based Thermal Interface Materials

Author

Gao, Jingyao, primary, Yan, Qingwei, additional, Tan, Xue, additional, Lv, Le, additional, Ying, Jufeng, additional, Zhang, Xiaoxuan, additional, Yang, Minghui, additional, Du, Shiyu, additional, Wei, Qiuping, additional, Xue, Chen, additional, Li, He, additional, Yu, Jinhong, additional, Lin, Cheng-Te, additional, Dai, Wen, additional, and Jiang, Nan, additional

Published
2021
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9. A Systematic Study of the Temperature Dependence of the Dielectric Function of GaSe Uniaxial Crystals from 27 to 300 K.

Author

Le LV, Nguyen TT, Nguyen XA, Cuong DD, Nguyen TH, Nguyen VQ, Cho S, Kim YD, and Kim TJ

Abstract

We report the temperature dependences of the dielectric function ε = ε 1 + i ε 2 and critical point (CP) energies of the uniaxial crystal GaSe in the spectral energy region from 0.74 to 6.42 eV and at temperatures from 27 to 300 K using spectroscopic ellipsometry. The fundamental bandgap and strong exciton effect near 2.1 eV are detected only in the c-direction, which is perpendicular to the cleavage plane of the crystal. The temperature dependences of the CP energies were determined by fitting the data to the phenomenological expression that incorporates the Bose-Einstein statistical factor and the temperature coefficient to describe the electron-phonon interaction. To determine the origin of this anisotropy, we perform first-principles calculations using the mBJ method for bandgap correction. The results clearly demonstrate that the anisotropic dielectric characteristics can be directly attributed to the inherent anisotropy of p orbitals. More specifically, this prominent excitonic feature and fundamental bandgap are derived from the band-to-band transition between s and p z orbitals at the Γ-point.

Published
2024
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