Second harmonic generation in WSe2

J. Ribeiro-Soares, C. Janisch, Z. Liu, A. L. Eĺias, M. S. Dresselhaus, M. Terrones, L. G. Cançado, A. Jorio

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58 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number045015
Journal2D Materials
Volume2
Issue number4
DOIs
StatePublished - Dec 16 2015

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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