University of Minnesota
School of Physics & Astronomy

Condensed Matter Seminar

Thursday, April 30th 2009
1:25 pm:
Condensed Matter Seminar in 210 Physics
Speaker: Professor Eva Andrei, Rutgers University
Subject: Scanning tunneling spectroscopy and transport measurements in suspended graphene

The recent discovery of methods to isolate graphene has opened an arena for new physics and applications stemming from charge carriers governed by quantum-relativistic dynamics. Because of the 2-d nature of graphene the relativistic properties of its charge carriers are easily obscured by environmental disturbances such as potential fluctuations induced by insulating substrates. I will describe scanning tunneling spectroscopy[1,3] and transport[2,4] experiments on suspended graphene decoupled from substrate fluctuations. Our findings include direct observation of Landau levels, measurement of the Fermi velocity, and evidence for electron-phonon and electron-electron interactions. In addition we find that, in contrast to non-suspended samples, Quantum Hall plateaus associated with valley-splitting interactions appear in suspended graphene at very low fields.

1. G. Li , E.Y. Andrei - Nature Physics,3, 623 (2007)
2. X. Du, G. Li, A. Barker, E. Y. Andrei, Nature Nanotecnology 3, 491 (2008)
3. G. Li, A. Luican, E. Y. Andrei arXiv:0803.4016
4. X. Du, I. Skachko, E.Y. Andrei, PRB 77,184507 (2008)

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