Electron-phonon coupling of epigraphene at millikelvin temperatures measured by quantum transport thermometry

Bayan Karimi; Hans He; Yu Cheng Chang; Libin Wang; Jukka P. Pekola; Rositsa Yakimova; Naveen Shetty; Joonas T. Peltonen; Samuel Lara-Avila; Sergey Kubatkin

doi:10.1063/5.0031315

Electron-phonon coupling of epigraphene at millikelvin temperatures measured by quantum transport thermometry

Bayan Karimi^*, Hans He, Yu Cheng Chang, Libin Wang, Jukka P. Pekola, Rositsa Yakimova, Naveen Shetty, Joonas T. Peltonen, Samuel Lara-Avila, Sergey Kubatkin

^*Corresponding author for this work

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Abstract

We investigate the basic charge and heat transport properties of charge neutral epigraphene at sub-kelvin temperatures, demonstrating a nearly logarithmic dependence of electrical conductivity over more than two decades in temperature. Using graphene's sheet conductance as an in situ thermometer, we present a measurement of electron-phonon heat transport at mK temperatures and show that it obeys the T4 dependence characteristic for a clean two-dimensional conductor. Based on our measurement, we predict the noise-equivalent power of ∼ 10 - 22 W / Hz of the epigraphene bolometer at the low end of achievable temperatures.

Original language	English
Article number	103102
Number of pages	4
Journal	Applied Physics Letters
Volume	118
Issue number	10
DOIs	https://doi.org/10.1063/5.0031315
Publication status	Published - 8 Mar 2021
MoE publication type	A1 Journal article-refereed

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title = "Electron-phonon coupling of epigraphene at millikelvin temperatures measured by quantum transport thermometry",

abstract = "We investigate the basic charge and heat transport properties of charge neutral epigraphene at sub-kelvin temperatures, demonstrating a nearly logarithmic dependence of electrical conductivity over more than two decades in temperature. Using graphene's sheet conductance as an in situ thermometer, we present a measurement of electron-phonon heat transport at mK temperatures and show that it obeys the T4 dependence characteristic for a clean two-dimensional conductor. Based on our measurement, we predict the noise-equivalent power of ∼ 10 - 22 W / Hz of the epigraphene bolometer at the low end of achievable temperatures.",

author = "Bayan Karimi and Hans He and Chang, {Yu Cheng} and Libin Wang and Pekola, {Jukka P.} and Rositsa Yakimova and Naveen Shetty and Peltonen, {Joonas T.} and Samuel Lara-Avila and Sergey Kubatkin",

note = "| openaire: EC/H2020/766025/EU//QuESTech ",

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doi = "10.1063/5.0031315",

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T1 - Electron-phonon coupling of epigraphene at millikelvin temperatures measured by quantum transport thermometry

AU - Karimi, Bayan

AU - He, Hans

AU - Chang, Yu Cheng

AU - Wang, Libin

AU - Pekola, Jukka P.

AU - Yakimova, Rositsa

AU - Shetty, Naveen

AU - Peltonen, Joonas T.

AU - Lara-Avila, Samuel

AU - Kubatkin, Sergey

N1 - | openaire: EC/H2020/766025/EU//QuESTech

PY - 2021/3/8

Y1 - 2021/3/8

N2 - We investigate the basic charge and heat transport properties of charge neutral epigraphene at sub-kelvin temperatures, demonstrating a nearly logarithmic dependence of electrical conductivity over more than two decades in temperature. Using graphene's sheet conductance as an in situ thermometer, we present a measurement of electron-phonon heat transport at mK temperatures and show that it obeys the T4 dependence characteristic for a clean two-dimensional conductor. Based on our measurement, we predict the noise-equivalent power of ∼ 10 - 22 W / Hz of the epigraphene bolometer at the low end of achievable temperatures.

AB - We investigate the basic charge and heat transport properties of charge neutral epigraphene at sub-kelvin temperatures, demonstrating a nearly logarithmic dependence of electrical conductivity over more than two decades in temperature. Using graphene's sheet conductance as an in situ thermometer, we present a measurement of electron-phonon heat transport at mK temperatures and show that it obeys the T4 dependence characteristic for a clean two-dimensional conductor. Based on our measurement, we predict the noise-equivalent power of ∼ 10 - 22 W / Hz of the epigraphene bolometer at the low end of achievable temperatures.

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U2 - 10.1063/5.0031315

DO - 10.1063/5.0031315

M3 - Article

AN - SCOPUS:85102432835

SN - 0003-6951

VL - 118

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 10

M1 - 103102

ER -

Electron-phonon coupling of epigraphene at millikelvin temperatures measured by quantum transport thermometry

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QuESTech: QUantum Electronics Science and TECHnology training

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Electron-phonon coupling of epigraphene at millikelvin temperatures measured by quantum transport thermometry

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QuESTech: QUantum Electronics Science and TECHnology training

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OtaNano

OtaNano – Low Temperature Laboratory

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