Abstract
Ba4Al5 is an electride in which excess anion electrons are confined in the two-dimensional interlayer region. Here, we carry out a systematical study on the electronic, optical, and plasmonic properties of Ba4Al5 using the first-principles calculations. It is found that the metallic Ba4Al5 has a relatively low cleavage energy (~ 0.77 J/m2), suggesting a weak interlayer interaction and the easiness of exfoliation. Importantly, Ba4Al5 possesses a low work function on the (001) surface and exhibit excellent optical properties, such as high light absorption coefficient with weak optical anisotropy that becomes stronger when decreasing the thickness. It is further found that Ba4Al5 is also a suitable plasmonic material which can be used in the near-infrared frequency range.
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This manuscript has no associated data or the data will not be deposited. [Authors’ comment: The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.]
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Acknowledgements
This work was supported by the Ministry of Science and Technology of China (No. 2022 YFE0109200) and National Natural Science Foundation of China (No. 12074013).
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This work was supported by the Ministry of Science and Technology of China (No. 2022 YFE0109200) and National Natural Science Foundation of China (No. 12074013).
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All the authors contributed to this study. YH and ZX thought about the main framework of this article. YH designed and verified the calculation method and carried out theoretical calculation. YH, CX, FZ, and ZX participated in the discussion and analysis of the calculation results. YF and CZ supervised the research of this project. YH wrote the initial draft and polished it under the guidance of ZX. All the authors participated in the writing and revision of the manuscript.
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Yang, H., Cao, X., Fang, Z. et al. Investigation of electronic, dielectric, and plasmonic properties of two-dimensional electride Ba4Al5. Eur. Phys. J. B 96, 3 (2023). https://doi.org/10.1140/epjb/s10051-022-00467-x
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DOI: https://doi.org/10.1140/epjb/s10051-022-00467-x