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1 PublicationExcitonic resonances in WS2 nanotubes
Staiger, M.; Rafailov, P.; Gartsman, K.; Telg, H.; Krause, M.; Radovsky, G.; Zak, A.; Thomsen, C.
Abstract
Resonance Raman profiles of WS2 nanotubes of different diameter are presented. We show that the A excitonic transition energy lies below the bulk value and is increasingly redshifted with decreasing diameter of the nanotubes. The findings are attributed to strain effects associated with the curvature of the nanotube walls. A silent Raman mode, the B1u mode, is disorder enhanced in the Raman spectra of WS2 nanomaterials.We discuss the development of the relative intensities of the B1u mode and the nearby A1g mode with nanotube diameter, excitation energy, and hydrostatic pressure in terms of a slight difference in resonance condition.
Keywords: PACS number(s): 78.30.−j; 63.22.Gh; 71.35.Gg
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Physical Review B 86(2012), 161523
DOI: 10.1103/PhysRevB.86.165423
Cited 44 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-18026