THz response of nonequilibrium electrons of highly doped graphene on a polar substrate

Autor:	Kukhtaruk, S. M.
Rok vydání:	2012
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Other Condensed Matter
Zdroj:	Ukr. J. Phys. Opt. 14(1), 24 (2013)
Druh dokumentu:	Working Paper
DOI:	10.3116/16091833/14/1/24/2013
Popis:	High-frequency response of a system with drifting electrons in a highly doped graphene and surface polar optical phonons of a polar substrate is considered. For this interacting system, we obtained a dielectric function, frequencies and decrement/increment of cooperative plasmon-optical phonon oscillations. We found, that the response is significantly depends on the degree of nonequilibrium of the electrons. In particular, interaction between drifting plasmons and surface polar optical phonons leads to an instability of the electron subsystem due to Vavilov-Cherenkov effect. We suggest that the hybrid system - graphene on a polar substrate - is capable to be used in amplifiers or generators of THz electromagnetic radiation. Comment: 8 pages, 2 figures. Replaces previous version with corrections of numerical estimates
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1211.3573 Zobrazit plný text záznamu View this record from Arxiv