Temperature-dependent optical constants of monolayer [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text]: spectroscopic ellipsometry and first-principles calculations.

Hsiang-Lin Liu; Teng Yang; Jyun-Han Chen; Hsiao-Wen Chen; Huaihong Guo; Riichiro Saito; Ming-yang Li; Lain-Jong Li

doi:10.1038/s41598-020-71808-y

Temperature-dependent optical constants of monolayer [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text]: spectroscopic ellipsometry and first-principles calculations.

Hsiang-Lin Liu, Teng Yang, Jyun-Han Chen, Hsiao-Wen Chen, Huaihong Guo, Riichiro Saito, Ming-yang Li, Lain-Jong Li

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

75 Scopus citations

Abstract

The temperature-dependent ([Formula: see text]) optical constants of monolayer [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] were investigated through spectroscopic ellipsometry over the spectral range of 0.73-6.42 eV. At room temperature, the spectra of refractive index exhibited several anomalous dispersion features below 800 nm and approached a constant value of 3.5-4.0 in the near-infrared frequency range. With a decrease in temperature, the refractive indices decreased monotonically in the near-infrared region due to the temperature-dependent optical band gap. The thermo-optic coefficients at room temperature had values from [Formula: see text] to [Formula: see text] for monolayer transition metal dichalcogenides at a wavelength of 1200 nm below the optical band gap. The optical band gap increased with a decrease in temperature due to the suppression of electron-phonon interactions. On the basis of first-principles calculations, the observed optical excitations at 4.5 K were appropriately assigned. These results provide basic information for the technological development of monolayer transition metal dichalcogenides-based photonic devices at various temperatures.

Original language	English (US)
Journal	Scientific reports
Volume	10
Issue number	1
DOIs	https://doi.org/10.1038/s41598-020-71808-y
State	Published - Sep 18 2020

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: H.L.L. thanks the Ministry of Science and Technology of Republic of China for its financial support under Grant-MOST 108-2112-M-003-013. T.Y. acknowledges the National Key R&D Program of China (2017YFA0206301) and the Major Program of Aerospace Advanced Manufacturing Technology Research Foundation NSFC and CASC, China (U1537204). H.G. acknowledges NSFC grant-51702146 and the Liaoning Province Doctor Startup Fund (201601325). R.S. acknowledges MEXT-Japan for Grant-JP18H01810. L.J.L. thanks the Taiwan Consortium of Emergent Crystalline Materials (TCECM), the Ministry of Science and Technology, and USA AFOSR BRI (FA238615100015).

Access to Document

10.1038/s41598-020-71808-y

https://repository.kaust.edu.sa/bitstream/10754/665321/1/temperature%20dependant.pdf

Cite this

@article{418e35791f7446abae5e1a16b38320bc,

title = "Temperature-dependent optical constants of monolayer [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text]: spectroscopic ellipsometry and first-principles calculations.",

abstract = "The temperature-dependent ([Formula: see text]) optical constants of monolayer [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] were investigated through spectroscopic ellipsometry over the spectral range of 0.73-6.42 eV. At room temperature, the spectra of refractive index exhibited several anomalous dispersion features below 800 nm and approached a constant value of 3.5-4.0 in the near-infrared frequency range. With a decrease in temperature, the refractive indices decreased monotonically in the near-infrared region due to the temperature-dependent optical band gap. The thermo-optic coefficients at room temperature had values from [Formula: see text] to [Formula: see text] for monolayer transition metal dichalcogenides at a wavelength of 1200 nm below the optical band gap. The optical band gap increased with a decrease in temperature due to the suppression of electron-phonon interactions. On the basis of first-principles calculations, the observed optical excitations at 4.5 K were appropriately assigned. These results provide basic information for the technological development of monolayer transition metal dichalcogenides-based photonic devices at various temperatures.",

author = "Hsiang-Lin Liu and Teng Yang and Jyun-Han Chen and Hsiao-Wen Chen and Huaihong Guo and Riichiro Saito and Ming-yang Li and Lain-Jong Li",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: H.L.L. thanks the Ministry of Science and Technology of Republic of China for its financial support under Grant-MOST 108-2112-M-003-013. T.Y. acknowledges the National Key R&D Program of China (2017YFA0206301) and the Major Program of Aerospace Advanced Manufacturing Technology Research Foundation NSFC and CASC, China (U1537204). H.G. acknowledges NSFC grant-51702146 and the Liaoning Province Doctor Startup Fund (201601325). R.S. acknowledges MEXT-Japan for Grant-JP18H01810. L.J.L. thanks the Taiwan Consortium of Emergent Crystalline Materials (TCECM), the Ministry of Science and Technology, and USA AFOSR BRI (FA238615100015).",

year = "2020",

month = sep,

day = "18",

doi = "10.1038/s41598-020-71808-y",

language = "English (US)",

volume = "10",

journal = "Scientific reports",

issn = "2045-2322",

publisher = "Nature Research",

number = "1",

}

Temperature-dependent optical constants of monolayer [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text]: spectroscopic ellipsometry and first-principles calculations. / Liu, Hsiang-Lin; Yang, Teng; Chen, Jyun-Han et al.
In: Scientific reports, Vol. 10, No. 1, 18.09.2020.

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

TY - JOUR

T1 - Temperature-dependent optical constants of monolayer [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text]: spectroscopic ellipsometry and first-principles calculations.

AU - Liu, Hsiang-Lin

AU - Yang, Teng

AU - Chen, Jyun-Han

AU - Chen, Hsiao-Wen

AU - Guo, Huaihong

AU - Saito, Riichiro

AU - Li, Ming-yang

AU - Li, Lain-Jong

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: H.L.L. thanks the Ministry of Science and Technology of Republic of China for its financial support under Grant-MOST 108-2112-M-003-013. T.Y. acknowledges the National Key R&D Program of China (2017YFA0206301) and the Major Program of Aerospace Advanced Manufacturing Technology Research Foundation NSFC and CASC, China (U1537204). H.G. acknowledges NSFC grant-51702146 and the Liaoning Province Doctor Startup Fund (201601325). R.S. acknowledges MEXT-Japan for Grant-JP18H01810. L.J.L. thanks the Taiwan Consortium of Emergent Crystalline Materials (TCECM), the Ministry of Science and Technology, and USA AFOSR BRI (FA238615100015).

PY - 2020/9/18

Y1 - 2020/9/18

N2 - The temperature-dependent ([Formula: see text]) optical constants of monolayer [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] were investigated through spectroscopic ellipsometry over the spectral range of 0.73-6.42 eV. At room temperature, the spectra of refractive index exhibited several anomalous dispersion features below 800 nm and approached a constant value of 3.5-4.0 in the near-infrared frequency range. With a decrease in temperature, the refractive indices decreased monotonically in the near-infrared region due to the temperature-dependent optical band gap. The thermo-optic coefficients at room temperature had values from [Formula: see text] to [Formula: see text] for monolayer transition metal dichalcogenides at a wavelength of 1200 nm below the optical band gap. The optical band gap increased with a decrease in temperature due to the suppression of electron-phonon interactions. On the basis of first-principles calculations, the observed optical excitations at 4.5 K were appropriately assigned. These results provide basic information for the technological development of monolayer transition metal dichalcogenides-based photonic devices at various temperatures.

AB - The temperature-dependent ([Formula: see text]) optical constants of monolayer [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] were investigated through spectroscopic ellipsometry over the spectral range of 0.73-6.42 eV. At room temperature, the spectra of refractive index exhibited several anomalous dispersion features below 800 nm and approached a constant value of 3.5-4.0 in the near-infrared frequency range. With a decrease in temperature, the refractive indices decreased monotonically in the near-infrared region due to the temperature-dependent optical band gap. The thermo-optic coefficients at room temperature had values from [Formula: see text] to [Formula: see text] for monolayer transition metal dichalcogenides at a wavelength of 1200 nm below the optical band gap. The optical band gap increased with a decrease in temperature due to the suppression of electron-phonon interactions. On the basis of first-principles calculations, the observed optical excitations at 4.5 K were appropriately assigned. These results provide basic information for the technological development of monolayer transition metal dichalcogenides-based photonic devices at various temperatures.

UR - http://hdl.handle.net/10754/665321

UR - http://www.nature.com/articles/s41598-020-71808-y

UR - http://www.scopus.com/inward/record.url?scp=85091192944&partnerID=8YFLogxK

U2 - 10.1038/s41598-020-71808-y

DO - 10.1038/s41598-020-71808-y

M3 - Article

C2 - 32943656

SN - 2045-2322

VL - 10

JO - Scientific reports

JF - Scientific reports

IS - 1

ER -

Temperature-dependent optical constants of monolayer [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text]: spectroscopic ellipsometry and first-principles calculations.

Abstract

Bibliographical note

Access to Document

Other files and links

Fingerprint

Cite this