| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Strain tunable excitonic optical properties in monolayer Ga2O3 |
| Hao-Lei Cui(崔浩磊), Zhen Quan(权真), and Shu-Dong Wang(王舒东)† |
| School of Physical Science and Technology, Inner Mongolia University, Hohhot 010021, China |
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Abstract Two-dimensional (2D) Ga$_{2}$O$_{3}$ has been confirmed to be a stable structure with five atomic layer thickness configuration. In this work, we study the quasi-particle electronic band structures and then access the excitonic optical properties through solving the Bethe-Salpeter equation (BSE). The results reveal that the exciton dominates the optical absorption in the visible light region with the binding energy as large as $\sim 1.0$ eV, which is highly stable at room temperature. Importantly, both the dominant absorption P$_{1}$ and P$_{2}$ peaks are optically bright without dark exciton between them, and thus is favorable for luminescence process. The calculated radiative lifetime of the lowest-energy exciton is 2.0$\times10^{-11}$ s at 0 K. Furthermore, the radiative lifetime under $+4$% tensile strain is one order of magnitude shorter than that of the strain-free case, while it is less insensitive under the compressive strain. Our findings set the stage for future theoretical and experimental investigation on monolayer Ga$_{2}$O$_{3}$.
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Received: 08 July 2024
Revised: 24 August 2024
Accepted manuscript online: 29 August 2024
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PACS:
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71.35.-y
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(Excitons and related phenomena)
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71.35.Cc
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(Intrinsic properties of excitons; optical absorption spectra)
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31.15.ag
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(Excitation energies and lifetimes; oscillator strengths)
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73.43.Cd
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(Theory and modeling)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 12064032). |
Corresponding Authors:
Shu-Dong Wang
E-mail: sdwang@imu.edu.cn
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Cite this article:
Hao-Lei Cui(崔浩磊), Zhen Quan(权真), and Shu-Dong Wang(王舒东) Strain tunable excitonic optical properties in monolayer Ga2O3 2024 Chin. Phys. B 33 107104
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