Electron-phonon coupling of epigraphene at millikelvin temperatures measured by quantum transport thermometry
Journal article, 2021
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
Aalto University
Hans He
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Yu Cheng Chang
Aalto University
Libin Wang
Aalto University
J. Pekola
Aalto University
Moscow Institute of Physics and Technology
Rositsa Yakimova
Linköping University
Naveen Shetty
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Joonas T. Peltonen
Aalto University
Samuel Lara Avila
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Sergey Kubatkin
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Applied Physics Letters
0003-6951 (ISSN) 1077-3118 (eISSN)
Vol. 118 10 103102Areas of Advance
Nanoscience and Nanotechnology
Subject Categories
Energy Engineering
Atom and Molecular Physics and Optics
Condensed Matter Physics
Infrastructure
Nanofabrication Laboratory
DOI
10.1063/5.0031315