Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/106750
Title: Contrast and Raman spectroscopy study of single- and few-layered charge density wave material : 2H-TaSe2
Authors: Hajiyev, Parviz
Cong, Chunxiao
Qiu, Caiyu
Yu, Ting
Issue Date: 2013
Source: Hajiyev, P., Cong, C., Qiu, C.,& Yu, T. (2013). Contrast and Raman spectroscopy study of single- and few-layered charge density wave material: 2H-TaSe2. Scientific Reports, 3.
Series/Report no.: Scientific reports
Abstract: In this article, we report the first successful preparation of single- and few-layers of tantalum diselenide (2H-TaSe2) by mechanical exfoliation technique. Number of layers is confirmed by white light contrast spectroscopy and atomic force microscopy (AFM). Vibrational properties of the atomically thin layers of 2H-TaSe2 are characterized by micro-Raman spectroscopy. Room temperature Raman measurements demonstrate MoS2-like spectral features, which are reliable for thickness determination. E1g mode, usually forbidden in backscattering Raman configuration is observed in the supported TaSe2 layers while disappears in the suspended layers, suggesting that this mode may be enabled because of the symmetry breaking induced by the interaction with the substrate. A systematic in-situ low temperature Raman study, for the first time, reveals the existence of incommensurate charge density wave phase transition in single and double-layered 2H-TaSe2 as reflected by a sudden softening of the second-order broad Raman mode resulted from the strong electron-phonon coupling (Kohn anomaly).
URI: https://hdl.handle.net/10356/106750
http://hdl.handle.net/10220/16637
ISSN: 2045-2322
DOI: 10.1038/srep02593
Rights: © 2013 Nature Publishing Group. This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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