Novel two-dimensional Janus β-Ge₂XY (X/Y = S, Se, Te) structures: first-principles examinations

Abstract

Two-dimensional (2D) structures can stably exist in different allotropes. In this manuscript, we propose a new series of Janus structures based on the $\beta$-phase of germanium monochalcogenides, namely, $\beta$-Ge$_2XY$ ($X/Y...

Dependence temperature on effective mass and susceptibility in quantum well-wires

“…Under strong laser pulse excitation, these materials exhibit exchange-correlation effects, along with the Coulomb interaction, leading to nonlinear optical phenomena [19][20][21]. The key components directly affecting the optical spectrum are mass and susceptibility, by calculating the imaginary part of the frequency-dependent optical susceptibility and mass, we obtain absorption or photoluminescence spectra [22][23][24]. Thus, susceptibility and effective mass electrons (holes) are highly important characteristics in the study of absorption spectra.…”