Condensed Matter Physics Seminar
2 p.m., Thursday, February 8, 2001
Room 1201, Physics Building
Liquid Crystal Phases in Quantum Hall Systems
(Department of Physics, University of Florida, Gainesville)
Abstract: Recent transport measurements of quantum Hall samples
in higher Landau levels by Lilly et al. have revealed a surprisingly
large anisotropy in the conductivity for nearly half filled Landau levels.
It is now believed that this anisotropy is due to the formation of a unidirectional
charge density wave; the elastic theory of such a state is similar
to that of a smectic liquid crystal. I will discuss the statistical
mechanics of this quantum Hall "smectic" phase, including the role of dislocations
in restoring the symmetry.
Host: Chris Lobb
C. Wexler and A. T. Dorsey, "Disclination unbinding transition in quantum
Hall liquid crystals," cond-mat/0009096.
C. Wexler and A. T. Dorsey, "Physics on the edge: contour dynamics, waves,
and solitons in the quantum Hall effect," Phys. Rev. B 60, 10971
C. Wexler and A. T. Dorsey, "Solitons on the edge of a two-dimensional
electron system," Phys. Rev. Lett. 82, 620 (1999).
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