12 research outputs found
Electronic Properties of Two-Dimensional Carbon
We present a theoretical description of the electronic properties of graphene
in the presence of disorder, electron-electron interactions, and particle-hole
symmetry breaking. We show that while particle-hole asymmetry, long-range
Coulomb interactions, and extended defects lead to the phenomenon of
self-doping, local defects determine the transport and spectroscopic
properties. Our results explain recent experiments in graphitic devices and
predict new electronic behavior.Comment: 4 pages, 5 figures. The paper was originally submitted on May, 12th,
200
Interactions, disorder and local defects in graphite
Recent experiments report the existence of ferromagnetic and superconducting
fluctuations in graphite at unexpectedly high temperatures. The interplay of
disorder and interactions in a 2D graphene layer is shown to give rise to a
rich phase diagram where strong coupling phases can become stable. Local
defects can explain the ferromagnetic signals.Comment: Presented at SNS'2004, Sitges,Spain, July 11-16,2004, being
considered for publication in Jour.Phys.Chem.Solid
PM2.5 aerosols collected in the Antarctic Peninsula with a solar powered sampler during austral summer periods
Collection of PM2.5 particles was carried out in Antarctica in the summer periods of years 2006 and 2007 using solar panels to operate the sampling unit. The unit was installed 2.5 km from the B. O'Higgins Chilean base to avoid possible air contamination from oil or gas burning electric power stations. The aerosols were analyzed by XRF identifying twenty elements between Na and Sr. Results showed the presence of elements of typical Earth crust and seawater origins. In addition, considerable amounts of non-sea sulfur together with traces of Pb and Se from probable long distant anthropogenic activities were observed. © 2009 Elsevier Ltd. All rights reserved