Hamburg 2001 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 15: Quanten-Hall-Effekt
HL 15.8: Vortrag
Dienstag, 27. März 2001, 12:15–12:30, S16
Elastic theory of quantum Hall smectics: effects of disorder — •Scheidl Stefan1 and von Oppen Felix2 — 1Institut für Theoretische Physik, Universität zu Köln — 2Institut für Theoretische Physik, Freie Universität Berlin
We study the effect of disorder on quantum Hall smectics within the framework of an elastic theory. Based on a renormalization group calculation, we derive detailed results for the degrees of translational and orientational order of the stripe pattern at zero temperature and carefully map out the disorder and length-scale regimes in which the system effectively exhibits smectic, nematic, or isotropic behavior. We show that disorder always leads to a finite density of free dislocations and estimate the scale on which they begin to appear.