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

Research output: Contribution to journalArticleScientificpeer-review

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 languageEnglish
Article number103102
Number of pages4
JournalApplied Physics Letters
Volume118
Issue number10
DOIs
Publication statusPublished - 8 Mar 2021
MoE publication typeA1 Journal article-refereed

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