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Lecture Erik van Heumen


18 April 2011 FWN-Building 5114.0004, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Erik van Heumen
Affiliation: Van der Waals-Zeeman Instituut, Universiteit van Amsterdam
Title: Electronic structure of iron-pnictide superconductors: just scratching the surface
Date: Mon Apr 18, 2011
Start: 11.30
Location: FWN-Building 5114.0004
Host: Paul van Loosdrecht
Telephone: +31 50 363 8149


 Angle resolved photoemission (ARPES) and scanning tunneling microscopy (STM) give complimentary, real and momentum space pictures of the electronic structure of solids. These techniques are however surface sensitive and one has to ensure that the electronic structure probed in an experiment corresponds to the bulk electronic structure. This turns out to be particularly important for the iron-pnictide supreconductors that are layered structures with alternately charged layers. Using a combination of experimental techniques (STM, ARPES, LEED) and theoretical calculations (LEED simulations, DFT), I will show that the surface is reconstructed in the most widely studied iron-pnictide superconductor, BaFe2-xCoxAs2. Having identified the surface states and bulk bands, we are now in a position to address the more important questions with regard to the electronic structure and its role in the mechanism of high temperature superconductivity.

Last modified:22 October 2012 2.30 p.m.