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Lecture Gerard Martinez


10 mei 2006 FWN-Building 5116.0136, Nijenborgh 4, 9747 AG, Groningen
Speaker:Prof. Gerard Martinez
Affiliation:Grenoble High Magnetic Field Laboratory, France
Title:Landau level spectroscopy of two-dimensional electron gas
Date:Wed May 10, 2006
Location:FWN-Building 5116.0136
Host:Paul van Loosdrecht
Telephone:+31 50 363 8149


A two dimensional electron gas has an energy spectrum which is completely quantified in Landau levels under the application of a magnetic field B perpendicular to the plane of the gas. The evolution of the Landau levels as well as the oscillator strength of the optical transitions between them reflect the nature of the energy dispersion governing their dependence as a function of the wave-vector. I will report on experimental results of infra-red spectroscopy performed on two different systems of bi-dimensional electron gas: the talk will cover the case of the quadratic energy dispersion law which is currently obtained in GaAs based systems and the case of linear dispersion law which is observed in a single sheet of graphite (graphene). It will be shown that these two systems behave in a complete different way as well for the number of transitions observed that for their energy and oscillator strength variation as a function of B.
Laatst gewijzigd:22 oktober 2012 14:31