[seminar] Seminar Prof. dr. RICHARD OSGOOD (IF, 15.01, 15 sati)

[seminar at ifs.hr]

Poštovani,

Obavještavamo Vas o održavanju seminara na Institutu za fiziku
u četvrtak, 15. siječnja u 15 sati (u zgradi Mladen Pajić), koji
će održati prof. Richard M. Osgood sa Electrical Engineering i
Applied Physics odsjeka na Columbia sveučilištu u New Yorku.
Sažetak predavanja te informacije o smjerovima istraživanja grupe
prof. Osgooda, nalaze se u nastavku poruke. Informacije o predavaču
također možete naći na:
<http://cumsl.msl.columbia.edu/osgood.html>


 Spectromicroscopy of single and multilayer graphene supported
             by a weakly interacting substrate

                      Richard M. Osgood
 Higgins Professor of Electrical Engineering and Applied Physics
              Columbia University, New York, NY 10027
                  E-mail: osgood at columbia.edu

While graphene's distinctive Dirac-cone electronic structure and
simple 2D atomic structure have attracted major interest in the
physics community, inherent limitations in the size of available
exfoliated graphene samples have made it difficult to study this
system with conventional UHV probes such as photoemission and low
energy electron diffraction (LEED). Thus, previous photoemission
and LEED studies of graphene have probed epitaxial films grown
crystalline substrates. While epitaxial graphene can form large
area sheets, exfoliated graphene on SiO2 continues to be the system
of choice for transport experiments as it is relatively easy to
gate and has shown the most interesting and impressive electrical
properties [1,2]. Using the high spatial resolution of the
Nanospectroscopy beamline at the Elettra synchrotron light source,
we have overcome these size limitations by utilizing micro-spot
low energy electron diffraction (&#181;LEED) and micro-spot angle
resolved photoemission (&#181;ARPES) to study exfoliated graphene.
In this talk, I will present the details of our diffraction and
photoemission results. LEED measurements provide information
about the surface morphology of monolayer and multilayer graphene
sheets, which are not atomically flat, but microscopically
corrugated. Our photoemission measurements probe the unique
massless fermionic dispersion of monolayer graphene.

In addition, I will also spend several minutes summarizing other
current research projects in photoemission/ STM studies in our
group at Columbia, including 2PPE, He-cooled STM, and reactive
oxide formation.

[1] K.S. Novoselov et al., Science 306, 666 (2004).
[2] Y.B. Zhang et al., Nature 438, 201 (2005).


RICHARD OSGOOD is Higgins Professor of Applied Physics and
Electrical Engineering at Columbia University.  He received
his BS and MS (Physics) from the USMA and Ohio State University,
respectively, and his PhD in Physics (Professor Ali Javan) from
the Massachusetts Institute of Technology in 1973.  His initial
research after his PhD was at MIT Lincoln Laboratory. At MIT,
his early work in molecular physics was in the area of
vibrational-energy transfer in gases and liquids and in gas-phase
and surface UV and IR spectroscopy as well as in new UV and IR
sources for this research.  In 1981 he become a professor at
Columbia University where he has taught and directed several
interdisciplinary research laboratories and groups in fundamental
molecular and surface physics. During the period from 2000-2002
he served, while on a leave of absence from Columbia, as
Associate Laboratory Director at Brookhaven National Laboratory,
where his responsibilities were for the Chemistry, Materials,
Condensed Matter Physics, Nanocenter, and NSLS Departments.
His research at Columbia has been in optical materials and
devices and in UHV surface science, including occupied-state
and two-photon photoemission and surface reactivity on single-
crystal metal-oxide, metal, semiconductor, and nanoscale
surfaces.  Much of his recent photoemission work has involved
femtosecond methods and ultrahigh-resolution ARPES synchrotron
spectroscopy.  His work on surface reactivity has involved
tunable lasers, UHV surface probes, time-of-flight mass
spectroscopy, STM, and various synchrotron probes. He was
awarded the Wood Award from the OSA in 1991 for his work with
Dan Ehrlich and Tom Deutsch in laser-controlled micrometer-
scale surface chemistry and he is a Fellow of the APS (Chemical
Physics), the OSA, and LEOS.  He has served on numerous review
and visiting boards for chemistry and low-energy physics for
the national labs, universities, DOE, and DARPA. He and his
group have published 392 peer-reviewed publications and he
has graduated 48 PhD students.  Previously he served on or
as Chair of the organizing committees for the Fall Meeting
of AVS Electronic Materials Section, the ACS Spring Meeting,
and the MRS Fall Meeting, as well as numerous IEEE Conferences.


Srdačan pozdrav,

Voditelji seminara IF-a
(Ticijana Ban i Marko Kralj)