Investigation of electronic, dielectric, and plasmonic properties of two-dimensional electride Ba4Al5 Hao Yang, Xinyu Cao, Zhenghui Fang, Zhengwei Chen, Feifei Yin and Xiao Zhang Eur. Phys. J. B, 96 1 (2023) 3 Published online: 09 January 2023 DOI: 10.1140/epjb/s10051-022-00467-x