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 of the epigraphene bolometer at the low end of achievable temperatures.
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; Electron-phonon coupling of epigraphene at millikelvin temperatures measured by quantum transport thermometry. Appl. Phys. Lett. 8 March 2021; 118 (10): 103102. https://doi.org/10.1063/5.0031315
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