HQS@HPC: Comparative numerical study of Anderson localisation in disordered electron systems

Gerald Schubert, Alexander Weiße, Gerhard Wellein () and Holger Fehske ()
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Gerald Schubert: Ernst-Moritz-Arndt-Universität Greifswald, Institut für Physik
Alexander Weiße: The University of New South Wales, School of Physics
Gerhard Wellein: Regionales Rechenzentrum Erlangen (RRZE)
Holger Fehske: Ernst-Moritz-Arndt-Universität Greifswald, Institut für Physik

A chapter in High Performance Computing in Science and Engineering, Garching 2004, 2005, pp 237-249 from Springer

Abstract: Abstract Taking into account that a proper description of disordered systems should focus on distribution functions, the authors develop a powerful numerical scheme for the determination of the probability distribution of the local density of states (LDOS), which is based on a Chebyshev expansion with kernel polynomial refinement and allows the study of large finite clusters (up to 1003). For the three-dimensional Anderson model it is demonstrated that the distribution of the LDOS shows a significant change at the disorder induced delocalisation-localisation transition. Consequently, the so-called typical density of states, defined as the geometric mean of the LDOS, emerges as a natural order parameter. The calculation of the phase diagram of the Anderson model proves the efficiency and reliability of the proposed approach in comparison to other localisation criteria, which rely, e.g., on the decay of the wavefunction or the inverse participation number.

Date: 2005
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DOI: 10.1007/3-540-28555-5_21

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