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Highlights
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Professor
El-Batanouny published his new book:
Symmetry
and
Condensed Matter Physics
Links to:
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- Topological Insulators Bi2Se3 / Bi2Te3
These
compounds, previously known for their favorable thermoelectric
properties, have become the new star materials in the growing field of
topological
insulators. These materials exhibit conductive surface states despite
being insulators throughout their bulk. In particular Bi2Se3 and Bi2Te3 exhibit
surface electronic states with linear dispersion in the form of a
single Dirac Cone at the center of their surface Brillouin zone. The relatively large bandgap (~0.3 eV) in Bi2Se3 makes
it an ideal candidate for theoretical and experimental study, as well
as potential applications in spintronics. Below you can see an image of
the rhomohedral unit cell as well as the isotropic surface Dirac cone
dispersion with arrows indicating the electronic transitions possible
as the result of scattering from phonons.
The corrugation of the Li-Cu-O (001) surface obtained from the
diffraction spectra:
An interesting structural transition was found on
this surface, as indicated in the animation below:
Structure and lattice dynamics of Sr2CuO2Cl2(001)
studied by helium-atom scattering: M. Farzaneh, X.-F. Liu, M. El-Batanouny, and F. C.
Chou, Phys. Rev. B 72,
085409 (2005).
Antiferromagnetic Ordering on CoO(001) Studied by Metastable Helium Beam Diffraction: P. Banerjee, X. Liu, M. Farzaneh, C.R. Willis, W. Franzen, and M. El-Batanouny, arXiv:cond-mat/0401130v1.
Observation of an extraordinary
antiferromagnetic transition on the NiO(100) surface by metastable
helium atom diffraction: M.
Marynowski, W. Franzen, M. El-Batanouny, and V. Staemmler, Phys. Rev. B 60,
6053 (1999).
Frozen spin-wave structure on the NiO(100)
surface observed by metastable He 23S scattering:
A. Swan, M. Marynowski, W. Franzen,
M. El-Batanouny, and K. M. Martini, Phys. Rev. Lett. 71,
1250
(1993).
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