Abstract
We discuss the nonradiative heat transfer in a nonequilibrium double-layer graphene system. We show that at the neutrality point the heat exchange is dominated by the interlayer plasmon modes and derive analytic expressions for the heat current as a function of temperature and the interlayer separation. These results show that for a range of low temperatures the two graphene layers are a much more efficient heat exchanger than conventional metals. The physical reason behind this phenomenon is the presence of interband excitations with a large energy, and a small momentum in the graphene spectrum. The plasmonic mechanism of the heat transfer is sharply suppressed by electrostatic doping. This allows for tuning of the heat exchange by a small applied voltage between the two layers.
| Original language | English (US) |
|---|---|
| Article number | 195426 |
| Journal | Physical Review B |
| Volume | 102 |
| Issue number | 19 |
| DOIs | |
| State | Published - Nov 20 2020 |
Bibliographical note
Funding Information:We are grateful to D. Basko, I. Gorny, A. Levchenko, O. Ilic, M. Sammon, J. Schmalian, and H. Yeh for useful discussions. This research was supported by NSF Grants No. DMR-1608238 and No. DMR-2037654 and partly by the Heising-Simons Foundation, the Simons Foundation, and NSF Grant No. NSF PHY-1748958.
Publisher Copyright:
© 2020 American Physical Society.