Second Harmonic Generation in WSe2

Second harmonic generation of single- and few-layer mechanically exfoliated tungsten diselenide (WSe2) samples are studied. The value of the effective second-order nonlinear susceptibility for monolayer WSe2 is obtained, being three orders of magnitude larger than the values usually reported for oth...

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Bibliographic Details
Published in:2d materials 2015-12, Vol.2 (4)
Main Authors: Ribeiro-Soares, J, Janisch, C, Liu, Z, Elías, A L, Dresselhaus, M S, Terrones, M, Cançado, L G, Jorio, A
Format: Article
Language:English
Subjects:
photoluminescence
Raman spectroscopy
second harmonic generation
transition metal dichalcogenides
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Summary:Second harmonic generation of single- and few-layer mechanically exfoliated tungsten diselenide (WSe2) samples are studied. The value of the effective second-order nonlinear susceptibility for monolayer WSe2 is obtained, being three orders of magnitude larger than the values usually reported for other nonlinear bulk crystals. The presence of a monolayer is certified by symmetry analysis of the Raman modes and the occurrence of a direct band gap. Our results on WSe2 solidify the family of transition metal dichalcogenides as two-dimensional systems with ultra high second-order nonlinear susceptibility.
ISSN:2053-1583
DOI:10.1088/2053-1583/2/4/045015