Showing papers by "Konstantin S. Novoselov published in 2009"
TL;DR: In this paper, high-pressure Raman spectroscopy was used to study monolayer, bilayer, and few-layer graphene samples supported on silicon in a diamond anvil cell to 3.5 GPa.
Abstract: In situ high-pressure Raman spectroscopy is used to study monolayer, bilayer, and few-layer graphene samples supported on silicon in a diamond anvil cell to 3.5 GPa. The results show that monolayer graphene adheres to the silicon substrate under compressive stress. A clear trend in this behavior as a function of graphene sample thickness is observed. We also study unsupported graphene samples in a diamond anvil cell to 8 GPa and show that the properties of graphene under compression are intrinsically similar to graphite. Our results demonstrate the differing effects of uniaxial and biaxial strain on the electronic band structure.
204 citations
Journal Article•
TL;DR: In this paper, the authors present infrared spectra 0.1 − 1 eV of electrostatically gated bilayer graphene as a function of doping and compare it with tight-binding calculations.
Abstract: We present infrared spectra 0.1–1 eV of electrostatically gated bilayer graphene as a function of doping and compare it with tight-binding calculations. All major spectral features corresponding to the expected interband transitions are identified in the spectra: a strong peak due to transitions between parallel split-off bands and two onset-like features due to transitions between valence and conduction bands. A strong gate voltage dependence of these structures and a significant electron-hole asymmetry are observed that we use to extract several band parameters. The structures related to the gate-induced band gap are less pronounced in the experiment than predicted by the tight-binding model that uses parameters obtained from previous experiments on graphite and recent self-consistent band-gap calculations.
112 citations
15 May 2009
TL;DR: Graphene is the first example of a truly two-dimensional crystal as discussed by the authors, which opens many interesting directions of research concerning the thermodynamics, lattice dynamics, and structural properties of such systems.
Abstract: Graphene is the first example of a truly two-dimensional crystal This opens many interesting directions of research concerning the thermodynamics, lattice dynamics, and structural properties of such systems Being a gapless semiconductor with a linear energy spectrum, single-layer graphene realizes a two-dimensional, massless Dirac fermion system that is of crucial importance for understanding unusual electronic properties, such as an anomalous QHE, absence of the Anderson localization, etc These peculiarities are important for developing new electronic devices such as carbon transistors Recent developments in production of large quantities of graphene, as well as the possibility of its chemical modification make such developments very feasible
32 citations