1302.6067 (V. Zólyomi et al.)

Band Structure and Optical Transitions in Atomic Layers of Hexagonal
Gallium Chalcogenides    [PDF]

V. Zólyomi, N. D. Drummond, V. I. Fal'ko

We report density functional theory calculations of the electronic band structures and optical absorption spectra of two-dimensional crystals of Ga$_2$X$_2$ (X=S, Se, and Te). Our calculation shows that all three two-dimensional materials are dynamically stable indirect-band-gap semiconductors with a Mexican-hat dispersion of holes near the top of the valence band.

View original: http://arxiv.org/abs/1302.6067