Showing papers by "K. S. Novoselov published in 2011"
TL;DR: Graphene's linear dispersion relation makes its charge carriers behave as if they were massless, however, near the Dirac point where graphene's valence and conduction bands meet, electron-electron interactions cause this relation to diverge, such that it becomes strongly nonlinear and the effective carrier velocity doubles.
Abstract: Graphene’s linear dispersion relation makes its charge carriers behave as if they were massless. However, near the Dirac point where graphene’s valence and conduction bands meet, electron–electron interactions cause this relation to diverge, such that it becomes strongly nonlinear and the effective carrier velocity doubles.
674 citations
TL;DR: In this paper, the femtosecond white-light continuum probe transient absorption and reflectivity measurements of bulk graphite and graphene paper are reported, and the results show that in 2D-graphene, the carrier relaxation occurs in ≃200
42 citations
Journal Article•
3 citations
Posted Content•
23 Mar 2011
2 citations
15 Sep 2011-Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali
TL;DR: In this article, the plasmonic effects of metal-nanostructures have been used to increase the response of graphene-based photodetectors to high frequencies.
Abstract: Graphene exhibits electrical and optical properties promising for future applications in ultra-fast photonics [1]. High carrier mobility and Fermi velocity [2, 3] combined with its constant absorption over the visible wavelength range to the near-infrared [4] potentially allow its application for photodetection over a broad wavelength spectrum, operating at high frequencies. However, absorption being 2.3% per monolayer [4], responsivity of these devices is rather low [5, 6]. Here we show that by combining graphene-based photodetectors with metal-nanostructures, plasmonic effects lead to an increased responsivity.