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Electron cooling with graphene-insulator-superconductor tunnel junctions and applications to fast bolometry
- Source :
- Phys. Rev. Applied 13, 054006 (2020)
- Publication Year :
- 2019
-
Abstract
- Electronic cooling in hybrid normal metal-insulator-superconductor junctions is a promising technology for the manipulation of thermal loads in solid state nanosystems. One of the main bottlenecks for efficient electronic cooling is the electron-phonon coupling, as it represents a thermal leakage channel to the phonon bath. Graphene is a two-dimensional material that exhibits a weaker electron-phonon coupling compared to standard metals. For this reason, we study the electron cooling in graphene-based systems consisting of a graphene sheet contacted by two insulator/superconductor junctions. We show that, by properly biasing the graphene, its electronic temperature can reach base values lower than those achieved in similar systems based on metallic ultra-thin films. Moreover, the lower electron-phonon coupling is mirrored in a lower heat power pumped into the superconducting leads, thus avoiding their overheating and preserving the cooling mechanisms. Finally, we analyze the possible application of cooled graphene as a bolometric radiation sensor. We study its main figures of merit, i.e. responsivity, noise equivalent power and response time. In particular, we show that the built-in electron refrigeration allows reaching a responsivity of the order of 50 nA/pW and a noise equivalent power of order of $\rm 10^{-18}\, W\, Hz^{-1/2}$ while the response speed is about 10 ns, corresponding to a thermal bandwidth in the order of 20MHz.<br />Comment: 19 pages, 9 figures
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Applied 13, 054006 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.1906.10988
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevApplied.13.054006