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Condensed Matter Colloquium Thursday, February 24, 2011

Summary: Condensed Matter Colloquium
Thursday, February 24, 2011
2 pm, Room 1201
Refreshments at 1:30 pm in Room 1305F
Jun Zhu
Penn State University
Electron-defect and Electron-electron Interaction in
Single and Bi-layer Graphene
Graphene and its two-layer sibling bi-layer graphene are two-dimensional
electron systems with many unusual physical properties. In this talk, I will
describe the remarkable transport and magneto-transport properties of
single-layer graphene modified with a dilute coverage of chemisorbed
fluorine adatoms. Chemisorbed adatoms are a unique type of atomic
defects interacting strongly with graphene. We observe colossal negative
magneto-resistance and anomalous phase breaking in these systems. I
will discuss the possible origins of the experimental observations. In the
second part of the talk, I will present experiments which accurately
determine the effective mass m* of bi-layer graphene and its band
structure. Our results show that electron-electron interaction plays an
important role in renormalizing the bands of bi-layer and suppressing the


Source: Appelbaum, Ian - Department of Physics, University of Maryland at College Park


Collections: Engineering; Materials Science