Condensed Matter Physics Seminar
2 p.m., Thursday, May 4, 2006
Room 1201, Physics Building
Unusual transport in low-dimensional graphitic nanomaterials
(Columbia University)
Abstract: The massless Dirac particle moving at the speed of light
has been a fascinating subject in relativistic quantum physics. Graphene, an
isolated single atomic layer of graphite, now provides us an opportunity to
investigate such exotic effect in low-energy condensed matter systems. The
unique electronic band structure of graphene lattice provides a linear
dispersion relation where the Fermi velocity replaces the role of the speed of
light in usual Dirac Fermion spectrum. In this presentation I will discuss
experimental consequence of Dirac Fermion spectrum in charge transport, realized
in two representative low dimensional graphitic carbon systems: 1-dimensional
carbon nanotubes and 2-dimensional graphene. Combined with semiconductor device
fabrication techniques and the development of new methods of nanoscaled material
synthesis/manipulation enables us to investigate mesoscopic transport phenomena
in these materials. The exotic quantum transport behavior discovered in these
materials, such as room temperature ballistic transport, unusual half-integer
quantum Hall effect, and a non-zero Berry's phase in magneto-oscillations will
be discussed in the connection to Dirac Fermion description in graphitic
systems.
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Host: Fuhrer
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