Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/13066
Title: Layer-dependent nonlinear optical properties and stability of non-centrosymmetric modification in few-layer GaSe sheets
Authors: Jie, W
Chen, X
Li, D
Xie, L
Hui, YY
Lau, SP 
Cui, X
Hao, J 
Keywords: Fluorescence
Gallium selenide
Photoluminescence
Second harmonic generation
Two-dimensional materials
Issue Date: 2015
Publisher: Wiley-VCH
Source: Angewandte chemie international edition, 2015, v. 54, no. 4, p. 1185-1189 How to cite?
Journal: Angewandte chemie international edition 
Abstract: Gallium selenide, an important second-order nonlinear semiconductor, has received much scientific interest. However, the nonlinear properties in its two-dimensional (2D) form are still unknown. A strong second harmonic generation (SHG) in bilayer and multilayer GaSe sheets is reported. This is also the first observation of SHG on 2D GaSe thin layers. The SHG of multilayer GaSe above five layers shows a quadratic dependence on the thickness; while that of a sheet thinner than five layers shows a cubic dependence. The discrepancy between the two SHG responses is attributed to the weakened stability of non-centrosymmetric GaSe in the atomically thin flakes where a layer-layer stacking order tends to favor centrosymmetric modification. Importantly, two-photon excited fluorescence has also been observed in the GaSe sheets. Our free-energy calculations based on first-principles methods support the observed nonlinear optical phenomena of the atomically thin layers.
URI: http://hdl.handle.net/10397/13066
ISSN: 1433-7851
EISSN: 1521-3773
DOI: 10.1002/anie.201409837
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