Optical absorption spectra of Xene and Xane (X = silic, german, stan). (6th July 2021)

• Record Type: Journal Article
• Authors: Nguyen-Truong, Hieu T; Van On, Vo; Lin, Ming-Fa
• Is Part Of: Journal of physics. Volume 33:Number 35(2021)
• Publication Date: 2021-07-06
• Subjects: optical absorption spectra -- 2D materials -- dielectric function; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/ac0d82
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We study optical absorption spectra of Xene and Xane (X = silic, german, stan). The results show that the optical absorption spectra of Xenes are dominated by a sharp peak near the origin due to direct interband transitions near the K point of the Brillouin zone. Meanwhile, the optical absorption spectra of Xanes are characterized by an excitonic peak. The Xenes are zero-gap materials with a Dirac cone at the K point, whereas Xanes are semiconductors with sizable band gaps. The quasiparticle band gaps of silicane, germanane, and stanane are 3.60, 2.21, and 1.35 eV, respectively; their exciton binding energies are 0.40, 0.33, and 0.20 eV, respectively.