Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 13: Poster 1

HL 13.27: Poster

Montag, 26. März 2007, 15:00–17:30, Poster A

Wigner-Crystalline Order of Two-Dimensional Electron Systems in High Magnetic Fields — •Guenther Meissner and Uwe Schmitt — Theoretische Physik, Universitaet des Saarlandes, Postfach 15 11 50, D-66041 Saarbruecken

A unified many-body approach which has been shown to allow for studying the nature of novel liquid and solid phases of interacting two-dimensional electrons in high magnetic fields is reexamined. Effects on collective excitations from including weak random disorder and from considering various quasi particles of composites of electrons and magnetic flux quanta are discussed in view of recent microwave resonance and inelastic light scattering experiments on high quality two-dimensional electron systems. The insulator terminating the series of fractional quantum Hall liquids at high magnetic fields is identified with the electron quantum solid being related to the Wigner crystal.