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Experimental evidence of disorder enhanced electron-phonon scattering in graphene devices

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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Experimental evidence of disorder enhanced electron-phonon scattering in graphene devices. / Evangeli, Charalambos; McCann, Edward; Swett, Jacob L. et al.
In: Carbon, Vol. 178, 30.06.2021, p. 632-639.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Evangeli, C, McCann, E, Swett, JL, Tewari, S, Bian, X, Thomas, J, Briggs, GAD, Kolosov, OV & Mol, JA 2021, 'Experimental evidence of disorder enhanced electron-phonon scattering in graphene devices', Carbon, vol. 178, pp. 632-639. https://doi.org/10.1016/j.carbon.2020.12.012

APA

Evangeli, C., McCann, E., Swett, J. L., Tewari, S., Bian, X., Thomas, J., Briggs, G. A. D., Kolosov, O. V., & Mol, J. A. (2021). Experimental evidence of disorder enhanced electron-phonon scattering in graphene devices. Carbon, 178, 632-639. https://doi.org/10.1016/j.carbon.2020.12.012

Vancouver

Evangeli C, McCann E, Swett JL, Tewari S, Bian X, Thomas J et al. Experimental evidence of disorder enhanced electron-phonon scattering in graphene devices. Carbon. 2021 Jun 30;178:632-639. Epub 2020 Dec 9. doi: 10.1016/j.carbon.2020.12.012

Author

Evangeli, Charalambos ; McCann, Edward ; Swett, Jacob L. et al. / Experimental evidence of disorder enhanced electron-phonon scattering in graphene devices. In: Carbon. 2021 ; Vol. 178. pp. 632-639.

Bibtex

@article{271713db71a94f3a961559c755c1f41e,
title = "Experimental evidence of disorder enhanced electron-phonon scattering in graphene devices",
abstract = "Induced disorder in graphene enables changes in electrical and thermal transport. It has been shown previously that disorder is very important for electron cooling in graphene through disorder-assisted electron-phonon scattering, particularly via the supercollisions process. Here we study electron-momentum relaxation due to electron-phonon scattering while increasing the degree of disorder. With in-situ scanning thermal microscopy we monitor the temperature rise in the constriction region of a bowtie-shaped graphene device while increasing the disorder by means of feedback-controlled voltage ramps at high-current densities. Analysis of the combined thermal and electrical measurements in the low bias regime shows that the relative change of the momentum scattering rate vs temperature, as measured at room temperature, increases with strong local disorder. By excluding other candidate mechanisms for this phenomenon, including a change of the charge carriers density and activation of optical phonons, we conclude that the increase we observe in the temperature-dependent component of the scattering rate is likely due to new acoustic phonon scattering channels that open up as disorder increases.",
keywords = "SThM, graphene, Nanoscale thermal transport, nanoscale heat transport, local heating, 2D materials, vdW materials",
author = "Charalambos Evangeli and Edward McCann and Swett, {Jacob L.} and Sumit Tewari and Xinya Bian and James Thomas and Briggs, {G. Andrew D.} and Kolosov, {Oleg V.} and Mol, {Jan A.}",
year = "2021",
month = jun,
day = "30",
doi = "10.1016/j.carbon.2020.12.012",
language = "English",
volume = "178",
pages = "632--639",
journal = "Carbon",
issn = "0008-6223",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Experimental evidence of disorder enhanced electron-phonon scattering in graphene devices

AU - Evangeli, Charalambos

AU - McCann, Edward

AU - Swett, Jacob L.

AU - Tewari, Sumit

AU - Bian, Xinya

AU - Thomas, James

AU - Briggs, G. Andrew D.

AU - Kolosov, Oleg V.

AU - Mol, Jan A.

PY - 2021/6/30

Y1 - 2021/6/30

N2 - Induced disorder in graphene enables changes in electrical and thermal transport. It has been shown previously that disorder is very important for electron cooling in graphene through disorder-assisted electron-phonon scattering, particularly via the supercollisions process. Here we study electron-momentum relaxation due to electron-phonon scattering while increasing the degree of disorder. With in-situ scanning thermal microscopy we monitor the temperature rise in the constriction region of a bowtie-shaped graphene device while increasing the disorder by means of feedback-controlled voltage ramps at high-current densities. Analysis of the combined thermal and electrical measurements in the low bias regime shows that the relative change of the momentum scattering rate vs temperature, as measured at room temperature, increases with strong local disorder. By excluding other candidate mechanisms for this phenomenon, including a change of the charge carriers density and activation of optical phonons, we conclude that the increase we observe in the temperature-dependent component of the scattering rate is likely due to new acoustic phonon scattering channels that open up as disorder increases.

AB - Induced disorder in graphene enables changes in electrical and thermal transport. It has been shown previously that disorder is very important for electron cooling in graphene through disorder-assisted electron-phonon scattering, particularly via the supercollisions process. Here we study electron-momentum relaxation due to electron-phonon scattering while increasing the degree of disorder. With in-situ scanning thermal microscopy we monitor the temperature rise in the constriction region of a bowtie-shaped graphene device while increasing the disorder by means of feedback-controlled voltage ramps at high-current densities. Analysis of the combined thermal and electrical measurements in the low bias regime shows that the relative change of the momentum scattering rate vs temperature, as measured at room temperature, increases with strong local disorder. By excluding other candidate mechanisms for this phenomenon, including a change of the charge carriers density and activation of optical phonons, we conclude that the increase we observe in the temperature-dependent component of the scattering rate is likely due to new acoustic phonon scattering channels that open up as disorder increases.

KW - SThM

KW - graphene

KW - Nanoscale thermal transport

KW - nanoscale heat transport

KW - local heating

KW - 2D materials

KW - vdW materials

U2 - 10.1016/j.carbon.2020.12.012

DO - 10.1016/j.carbon.2020.12.012

M3 - Journal article

VL - 178

SP - 632

EP - 639

JO - Carbon

JF - Carbon

SN - 0008-6223

ER -