ENGLISH
La vitrine de diffusion des publications et contributions des chercheurs de l'ÉTS
RECHERCHER

High-field response of gated graphene at terahertz frequencies

Téléchargements

Téléchargements par mois depuis la dernière année

Plus de statistiques...

Razavipour, Hadi et Yang, Wayne et Guermoune, Abdeladim et Hilke, Michael et Cooke, David G. et Al-Naib, Ibraheem et Dignam, Marc M. et Blanchard, François et Hafez, Hassan A. et Chai, Xin et Ferachou, Denis et Ozaki, Tsuneyuki et Lévesque, Pierre L. et Martel, Richard. 2015. « High-field response of gated graphene at terahertz frequencies ». Physical Review B, vol. 92, nº 24.

[img]
Prévisualisation
PDF
Blanchard F. 2015 12031 Pre-print High-field response of gated graphene at terahertz frequencies.pdf - Version soumise

Télécharger (3MB) | Prévisualisation

Résumé

We study the Fermi energy level dependence of nonlinear terahertz (THz) transmission of gated multi-layer and single-layer graphene transferred onto sapphire and quartz substrates. The two samples represent two limits of low-field impurity scattering: short-range neutral and long-range charged impurity scattering, respectively. We observe an increase in the transmission as the field amplitude is increased due to intraband absorption bleaching starting at fields above 8 kV/cm. This e↵ect arises from a field-induced reduction in THz conductivity that depends strongly on the Fermi energy. We account for intraband absorption using a free carrier Drude model that includes neutral and charged impurity scattering as well as optical phonon scattering. We find that although the Fermi-level dependence in the monolayer and five-layer samples is quite di↵erent, both exhibit a strong dependence on the field amplitude that cannot be explained on the basis of an increase in the lattice temperature alone. Our results provide a deeper understanding of transport in graphene devices operating at THz frequencies and in modest kV/cm field strengths where nonlinearities exist.

Type de document: Article publié dans une revue, révisé par les pairs
Informations complémentaires: Identifiant de l'article: 245421
Professeur:
Professeur
Blanchard, François
Affiliation: Génie électrique
Date de dépôt: 18 déc. 2015 14:56
Dernière modification: 20 janv. 2016 14:49
URI: http://espace2.etsmtl.ca/id/eprint/12031

Actions (Authentification requise)

Dernière vérification avant le dépôt Dernière vérification avant le dépôt