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Título

Hot-carrier seebeck effect: Diffusion and remote detection of hot carriers in graphene

AutorSierra, Juan F. ; Neumann, Ingmar ; Costache, Marius V. ; Valenzuela, Sergio O.
Palabras claveElectron−phonon interaction
Supercollisions
Graphene
Seebeck effect
Hot carriers
Fecha de publicación2015
EditorAmerican Chemical Society
CitaciónNano Letters 15(6): 4000-4005 (2015)
ResumenWe 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.
URIhttp://hdl.handle.net/10261/122570
DOI10.1021/acs.nanolett.5b00922
Identificadoresdoi: 10.1021/acs.nanolett.5b00922
issn: 1530-6984
e-issn: 1530-6992
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