| Autor: |
Sierra, J. F., Neumann, I., Costache, M. V., Valenzuela, S. O. |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Nano Letters, pp 4000-4005, 15 (2015) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1021/acs.nanolett.5b00922 |
| Popis: |
We investigate hot carrier propagation across graphene using an electrical nonlocal injection/detection method. The device consists of a monolayer graphene flake contacted by multiple metal leads. Using two remote leads for electrical heating, we generate a carrier temperature gradient that results in a measurable thermoelectric voltage VNL across the remaining (detector) leads. Due to the nonlocal character of the measurement, VNL is exclusively due to the Seebeck effect. Remarkably, a departure from the ordinary relationship between Joule power P and VNL, VNL ~ P, becomes readily apparent at low temperatures, representing a fingerprint of hot-carrier dominated thermoelectricity. By studying VNL as a function of bias, we directly determine the carrier temperature and the characteristic cooling length for hot-carrier propagation, which are key parameters for a variety of new applications that rely on hot-carrier transport. |
| Databáze: |
arXiv |
| Externí odkaz: |
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