Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 51: Poster IV

HL 51.20: Poster

Donnerstag, 28. Februar 2008, 16:30–19:00, Poster D

Wigner-cystalline order and massless Dirac fermions in 2 DES at high magnetic fields — •Guenther Meissner — Theoretische Physik, Universitaet des Saarlandes, Postfach 15 11 50, D-66041 Saarbruecken

A many-body approach for studying the nature of novel liquid and solid phases of interacting two dimensional (2D) 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 microwave resonance and inelastic light scattering experiments on high quality 2D electron systems. Modifications resulting from the behavior of electrons in graphene as massless Dirac fermions are pointed out. 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.