Berlin 2012 – wissenschaftliches Programm

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AGjDPG: Arbeitsgruppe junge DPG

AGjDPG 10: Erfahrungsaustausch Internationales

AGjDPG 10.1: Poster

Donnerstag, 29. März 2012, 16:00–19:00, Poster C

Counting Electrons in Umeå — •Stephan Köhler — Johannes Gutenberg-Universität Mainz

Umeå University (UMU) is the fifth oldest university in Sweden situated in one of the fastest growing cities of the country. With its strong and broadly oriented mathematics and physics departments, covering subject from materials science to astrophysics, it is also a stimulating place for physics students from abroad. Here I present an introduction to the physics program and student life in Umeå. I will also present a project I performed in the theoretical physics department at UMU. In this project I compared two approaches to Full Counting Statistics of Electrons (FCS). The goal of FCS is to predict the response of electrons in a mesoscopic circuit to an applied voltage, a behavior that becomes more and more important as nanotechnology advances. The influential approach by Levitov, Lee and Lesovik [1] is introduced and compared to the approach by Rammer, Shelankov and Wabnig [2]. It is shown that both approaches are only equal if the electron system is in a pure state in the charge representation.

[1] L. Levitov, H. Lee, and G. Lesovik, J. Math. Phys. 37, 4845 (1996) [2] J. Rammer, A. Shelankov, and J. Wabnig, Phys. Rev. B 70, 115327 (2004)