Selected Publications

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

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/sqrt(Hz) of the epigraphene bolometer at the low end of achievable temperatures.

Appl. Phys. Lett. 118, 103102 (2021)

doi: 10.1063/5.0031315