Abstract
In this work, we report on hot carrier diffusion in graphene across large enough length scales that the carriers are not thermalized across the crystal. The carriers are injected into graphene at one site and their thermal transport is studied as a function of applied power and distance from the heating source, up to tens of micrometers away. Superconducting contacts prevent out-diffusion of hot carriers to isolate the electron-phonon coupling as the sole channel for thermal relaxation. As local thermometers, we use the amplitude of the universal conductance fluctuations, which varies monotonically as a function of temperature. By measuring the electron temperature simultaneously along the length we observe a thermal gradient which results from the competition between electron-phonon cooling and lateral heat flow.
| Original language | English |
|---|---|
| Article number | 125427 |
| Journal | Physical Review B |
| Volume | 99 |
| Issue number | 12 |
| DOIs | |
| State | Published - Mar 29 2019 |
Bibliographical note
Publisher Copyright:© 2019 American Physical Society.
Funding
Transport measurements conducted by A.W.D., E.G.A., and G.F. were supported by Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, U.S. Department of Energy, under Award No. DE-SC0002765. Lithographic fabrication and characterization of the samples performed by A.W.D., A.S., and B.E. was supported by ARO Grant No. W911NF16-1-0122 and NSF Grants No. ECCS-1610213 and No. DMR-1743907. F.A. was supported by Army Research Office (Grant No. W911NF16-1-0132) and the North Carolina Space grant (Award No. 2015-1942-AP-05). I.V.B. acknowledges CityU New Research Initiatives/Infrastructure Support from Central (APRC) (Grant No. 9610395). Transport measurements conducted by A.W.D., E.G.A., and G.F. were supported by Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, U.S. Department of Energy, under Award No. DE-SC0002765. Lithographic fabrication and characterization of the samples performed by A.W.D., A.S., and B.E. was supported by ARO Grant No. W911NF16-1-0122 and NSF Grants No. ECCS-1610213 and No. DMR-1743907. F.A. was supported by Army Research Office (Grant No. W911NF16-1-0132) and the North Carolina Space grant (Award No. 2015-1942-AP-05). I.V.B. acknowledges CityU New Research Initiatives/Infrastructure Support from Central (APRC) (Grant No. 9610395).
| Funders | Funder number |
|---|---|
| APRC | 9610395 |
| CityU New Research Initiatives/Infrastructure Support from Central | |
| Office of Basic Energy Sciences | |
| U.S. Department of Energy | DE-SC0002765 |
| Directorate for Education and Human Resources | 1106401 |
| Army Research Office | W911NF16-1-0132, ECCS-1610213 |
| North Carolina Space Grant | 2015-1942-AP-05 |
| Division of Materials Sciences and Engineering |