Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 51: Poster IV
HL 51.34: Poster
Donnerstag, 28. Februar 2008, 16:30–19:00, Poster D
Anomalously localized states at the metal-insulator transition in the Anderson model of localization — •Philipp Cain and Michael Schreiber — Institut für Physik, Technische Universität, D-09107 Chemnitz
Exceptional statistical fluctuations of the disordered potential lead to very strongly localized states. These so-called anomalously localized states (ALSs) appear also among the critical eigenstates at the metal-insulator transition (MIT) and might influence the behaviour of the critical properties. We identify ALSs for the Anderson model of localization at the MIT in the band centre of three-dimensional disordered samples. From the study of the multifractal correlation exponent z(q) and the correlation dimension D2 we can conclude that ALSs affect the critical properties at the MIT. Therefore the ALSs should be excluded from the ensemble in order to achieve a better characterization of the critical behaviour. However, in our investigation the improvement is not as good as it has been found in the 2D symplectic case.