Faculty Publications

Raman Spectroscopy Of Optical Phonon And Charge Density Wave Modes In 1T-Tise2 Exfoliated Flakes

Document Type

Article

Keywords

Charge density wave, Raman spectroscopy, Titanium diselenide, Transition metal dichalcogenide

Journal/Book/Conference Title

Solid State Communications

Volume

266

First Page

21

Last Page

25

Abstract

1T-TiSe2 is

Amodel transition metal dichalcogenide material that develops charge density waves (CDWs). Here we present variable-temperature Raman spectroscopy study on both CDW and optical phonon modes of 1T-TiSe2 thin layers exfoliated onto SiO2 substrate. Raman scattering intensities of all modes reach

Amaximum when the sample thickness is about 12 nm. This phenomenon can be explained by optical interference effect between the sample and the substrate. The CDW amplitude modes experience redshift and broadening as temperature increases. We extract CDW transition temperature (TCDW) from temperature dependence of the frequency of A1 gCDW mode. We find that TCDW decreases in thinner flakes, which could be due to extrinsic effects.

Original Publication Date

10-1-2017

DOI of published version

10.1016/j.ssc.2017.08.014

Repository

UNI ScholarWorks, Rod Library, University of Northern Iowa

Language

en

Link to Full Text

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