Graphene and Carbon-Based Materials

Carbon is the most important element for all living organisms in Earth, as most of the organic elements are made out of it. A unique and fascinating aspect of carbon is the variety of forms that it can assume when two or more atoms are brought together.

Our research focuses on understanding the unique role that topology plays for the electronic properties of carbon materials, and in understanding the role of the electron-electron and electron-phonon interaction.  We are also interested in further exploring superconductivity and magnetism in these systems.  On a more applied level we are exploring different carbon complex as candidate for the hydrogen storage economy. To learn more about specific projects, please follow these links:

After so many years of studying carbon, mystery still remains surrounding the question of how many crystallographic forms, or allotropes, of carbon exist.  The known forms of carbon are graphene, graphite, diamond, nanotubes, fullerenes (C60, C36.), and nanodiamondoids, each of them characterized by different hybrid orbitals (sp2, sp3, sp).  A variety of novel properties can be observed as a function of topology of carbon leading to metal-insulator transitions, semiconductors, superconductivity and magnetism.

Selected Publications

(Please see Journal Articles for a more complete list.)

Many-body interactions in quasi-freestanding graphene
David A. Siegel, Cheol-Hwan Park, Choongyu Hwang, Jack Deslippe, Alexei V. Fedorov, Steven G. Louie, and Alessandra Lanzara
PNAS, 108, 11365-11369 (2011)

Direct measurement of quantum phases in graphene via photoemission spectroscopy
Choongyu Hwang, Cheol-Hwan Park, David A. Siegel, Alexei V. Fedorov, Steven G. Louie, and Alessandra Lanzara
Phys. Rev. B 84, 125422 (2011)

Substrate-induced band gap opening in epitaxial graphene
S.Y. Zhou, G.-H. Gweon, A.V. Fedorov, P.N. First, W.A. der Heer, D.-H. Lee, F. Guinea, A.H. Castro Neto, A. Lanzara
Nature Materials 6, 770 (2007)

First direct observation of Dirac fermions in graphite
S. Y. Zhou, G.-H. Gweon, J. Graf, A. V. Fedorov, C. D. Spataru, R. D. Diehl, Y. Kopelevich, D.-H. Lee, Steven G. Louie, A. Lanzara
Nature Physics 2, 595-599 (2006)