Driving forces for ultrafast laser-induced sp2 to sp3 structural transformation in graphite

Ultrafast Electronic and Structural Phenomena in Graphite and Graphene

Structural transformation of graphite by arc-discharge

The formation of novel structures by the passage of an electric current through graphite is described. These structures apparently consist of hollow three-dimensional graphitic shells bounded by curved and faceted planes, typically made up of two graphene layers. The curved structures were frequently decorated with nano-scale carbon particles, or short nanotubes. In some cases, nanotubes were f...

Structural Preablation Dynamics of Graphite Observed by Ultrafast Electron Crystallography

Fabrizio Carbone, Peter Baum, Petra Rudolf, and Ahmed H. Zewail Physical Biology Center for Ultrafast Science & Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena California, 91125, USA Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, NL-9747AG Groningen, The Netherlands (Received 15 October 2007; published ...

Pressure-Induced Transformation of Graphite and Diamond to Onions

In this study, we present a number of experiments on the transformation of graphite, diamond, and multiwalled carbon nanotubes under high pressure conditions. The analysis of our results testifies to the instability of diamond in the 55–115 GPa pressure range, at which onion-like structures are formed. The formation of interlayer sp3-bonds in carbon nanostructures with a decrease in their volum...

Laser-induced ultrafast demagnetization in ferromagnetic metals.

The laser-induced femtosecond demagnetization in ferromagnetic metals is investigated theoretically. Different from the conventional nanosecond one, this ultrafast demagnetization is a cooperative effect of the external laser field and the internal spin-orbit coupling. The spin-orbit coupling smears out the original identities of triplets and singlets while the laser field uses it as an avenue ...