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CPM Seminar
Special CPM Seminar
Inter Landau level spectroscopy of thin graphite layers
Marek Potemski
Grenoble High Magnetic Field Laboratory
CNRS
The emerging research on graphene (a single atomic layer of graphite),
a materia prima for other forms of carbon such as carbon molecules and
nanotubes (wrapped layers of graphene), is driven by its interesting
physics and by the potential development of carbon technology in view
of graphene's robustness and its plausible integration with carbon
nanostructures. Following the very recent demonstrations of the possibility
of obtaining graphene sheets [1], magneto-resistance
measurements of a single layer [2] have demonstrated an
unusual sequence of quantum Hall effect states, confirming the applicability
of the quantum relativistic model to this system.
In this talk, the far infrared magneto-absorption experiments, performed
on thin graphitic layers will be reported. The observed cyclotron
resonance-like and electron-positron-like transitions will be shown to be
in excellent agreement with the expectations of a single-particle model of
(relativistic-like) Dirac fermions in graphene with an effective velocity
of c* = 1.03x106 m/s.
| 1. |
K. S. Novoselov, A. K. Geim, S. V. Morozov, D. Jiang, Y. Zhang,
S. V. Dubonos, I. V. Grigorieva, and A. A. Firsov, Science
306, 666 (2004)
C. Berger, Z. Song, T. Li, X. Li, A. Y. Ogbazghi, R. Feng, Z. Dai, A. N.
Marchenkov, E. H. Conrad, P. N. First, J. Phys. Chem. 108,
19912 (2004).
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| 2. |
K. S. Novoselov, A. K. Geim, S. V. Morozov, D. Jiang, M. I. Katsnelson,
I. V. Grigorieva, S. V. Dubonos, and A. A. Firsov, Nature 438,
197 (2005)
Y. Zhang, Y.-W. Tan, H. L. Stormer, and P. Kim, Nature 438,
201 (2005).
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| 3. |
3. M.L. Sadowski, G. Martinez, M. Potemski, C. Berger, and W.A. de Heer,
cond-mat/0605739
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Monday, November 13th 2006, 10:00
Ernest Rutherford Physics Building, R.E. Bell Conference Room (room 103)
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