Strong quantum confinement effect in the optical properties of ultrathin α-In2Se3

Abstract

The effect of quantum confinement in the optical absorption spectra of atomically thin α-In2Se3 crystals is studied, observing a huge thickness-dependent shift in the optical band gap of exfoliated α-In2Se3 flakes. The band gap variation reported here is among the largest found in semiconductor crystals and spans a region of the near-UV spectrum uncovered by other 2D semiconductors.

arXiv comment3 Figures + 6 Supp. Info. figures

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• Many-body description of two-dimensional van der Waals ferroelectric $\alpha -$In${}_2$Se${}_3$