Journal
2D MATERIALS
Volume 2, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/2/4/045015
Keywords
transition metal dichalcogenides; second harmonic generation; Raman spectroscopy; photoluminescence
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Funding
- Brazilian Conselho Nacional de Desenvolvimento Cientfico e Tecnolgico (CNPq) [551953/2011-0, 552124/2011-7]
- National Science Foundation [DMR-1004147, EFRI-1433311, 2DARE - EFRI - 51372131]
- Brazilian agency National Counsel of Technological and Scientific Development (CNPq)
- Brazilian agency Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG)
- U.S. Army Research Office MURI [W911NF-11-1 - 0362]
- Directorate For Engineering
- Emerging Frontiers & Multidisciplinary Activities [1433311] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1004147] Funding Source: National Science Foundation
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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.
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