Raman spectroscopy of optical phonon and charge density wave modes in 1T-TiSe2 exfoliated flakes

Lin Cui; Rui He; Gaomin Li; Yujun Zhang; Yumeng You; Mingyuan Huang

doi:10.1016/j.ssc.2017.08.014

Raman spectroscopy of optical phonon and charge density wave modes in 1T-TiSe₂ exfoliated flakes

Lin Cui, Rui He, Gaomin Li, Yujun Zhang, Yumeng You, Mingyuan Huang

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

1T-TiSe₂ is a model 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 a maximum 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 (T_CDW) from temperature dependence of the frequency of A_{1 g}^CDW mode. We find that T_CDW decreases in thinner flakes, which could be due to extrinsic effects.

Original language	English
Pages (from-to)	21-25
Number of pages	5
Journal	Solid State Communications
Volume	266
DOIs	https://doi.org/10.1016/j.ssc.2017.08.014
State	Published - Oct 2017

Keywords

Charge density wave
Raman spectroscopy
Titanium diselenide
Transition metal dichalcogenide

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10.1016/j.ssc.2017.08.014

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title = "Raman spectroscopy of optical phonon and charge density wave modes in 1T-TiSe2 exfoliated flakes",

abstract = "1T-TiSe2 is a model 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 a maximum 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.",

keywords = "Charge density wave, Raman spectroscopy, Titanium diselenide, Transition metal dichalcogenide",

author = "Lin Cui and Rui He and Gaomin Li and Yujun Zhang and Yumeng You and Mingyuan Huang",

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year = "2017",

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doi = "10.1016/j.ssc.2017.08.014",

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T1 - Raman spectroscopy of optical phonon and charge density wave modes in 1T-TiSe2 exfoliated flakes

AU - Cui, Lin

AU - He, Rui

AU - Li, Gaomin

AU - Zhang, Yujun

AU - You, Yumeng

AU - Huang, Mingyuan

PY - 2017/10

Y1 - 2017/10

N2 - 1T-TiSe2 is a model 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 a maximum 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.

AB - 1T-TiSe2 is a model 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 a maximum 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.

KW - Charge density wave

KW - Raman spectroscopy

KW - Titanium diselenide

KW - Transition metal dichalcogenide

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U2 - 10.1016/j.ssc.2017.08.014

DO - 10.1016/j.ssc.2017.08.014

M3 - Article

AN - SCOPUS:85028334039

SN - 0038-1098

VL - 266

SP - 21

EP - 25

JO - Solid State Communications

JF - Solid State Communications

ER -

Raman spectroscopy of optical phonon and charge density wave modes in 1T-TiSe₂ exfoliated flakes

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