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Condensed Matter Seminars
| Condensed Matter
Thursday, October 29, 2009
Physics Building, Room 204
Note special time.
Note special room.
[Host: Keith Williams]
Univ. of Arizona
"Local electronic properties of graphene"
Combining scanning probe microscopy with electrical
transport measurements is a powerful approach to probe low-dimensional
systems. The local information provided by scanning probe microscopy
is invaluable for studying effects such as electron-electron
interactions and scattering. Using this approach, we have probed the
local electronic properties of mono- and bilayer graphene with atomic
resolution. We studied the effect of ripples, charged impurities and
defects on the local density of states. We find that long-range
scattering from ripples and impurities shifts the Dirac point leading
to electron and hole puddles. Short-range scattering from lattice
defects mixes the two sublattices of graphene and tends to be strongly
suppressed away from the Fermi energy. In addition, in bilayer
graphene we observe an opening of a band gap due to the application of
a transverse electric field.
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