A Photothermoelectric Effect in Graphene
Résumé
A conventional thermocouple consists of two different metal wires placed in contact with each other. When the junction is heated and the free ends are kept cold, a voltage can be measured across the two free ends. If the metals are the same, then no voltage should appear. On page 648 of this issue, Gabor et al. ( 1) report a thermo couple effect that contradicts this conventional expectation. Upon heating a junction made of a single graphene sheet by shining laser light on it, they found that a voltage does develop across the junction. The observed photothermoelectric effect could be potentially exploited in novel optoelectronic devices.
Domaines
Physique Quantique [quant-ph]
Origine : Fichiers produits par l'(les) auteur(s)
Loading...