Regensburg 2004 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 22: Transport im hohen Magnetfeld/Quanten-Hall-Effekt
HL 22.2: Vortrag
Dienstag, 9. März 2004, 15:30–15:45, H14
Renormalizing into the mesoscopic quantum Hall insulator — •Philipp Cain1, Rudolf A. Römer2, and Michael Schreiber1 — 1Institut für Physik, Technische Universität, D-09107 Chemnitz — 2Department of Physics, University of Warwick, Coventry CV4 7AL, UK
Using the Chalker-Coddington network model as a drastically simplified, but universal model of integer quantum Hall physics, we investigate the plateau-to-insulator transition at strong magnetic field by means of a real-space renormalization approach. Our results suggest that for a fully quantum coherent situation, both the Hall insulator with diverging Hall resistance RH and the quantized Hall insulator with RH≈ h/e2 can be observed depending on the precise nature of the averaging procedure.