Dipole Orientation Shift of Ga2Se2 by Quantum Confinement.
ACS nano(2020)
Abstract
In the family of III-VI monochalcogenides M2X2 (M = Gallium, Indium; X = Sulfur, Selenide, etc), the interlayer interaction and the electronic band edges share the contribution of the same chalcognide atomic orbits. This makes quantum confinement and interlayer interaction play a subtle role in 2 dimensional (2D) monochalcogenides crystals. In this report we study the direction-resolved photoluminescence of 2D Ga2Se2 at various thickness. We observe that the in-plane dipole radiation survives but out-of-plane dipole radiation fades at 2D limit.
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Key words
dipole orientation,quantum confinement,Ga2Se2,interlayer coupling,two-dimensional semiconductor,monochalcogenides
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