Fluctuations and topological transitions of quantum Hall stripes: nematics as anisotropic hexatics

Details Fluctuations and topological transitions of quantum Hall stripes: nematics as anisotropic hexatics Fluctuations and topological transitions of quantum Hall stripes: nematics as anisotropic hexatics

2006-11-24

arxiv.org/abs/cond-mat/0611638v3

Phys. Rev. B 76, 161306(R) (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures; version published in the Rapid Communications section of Phys. Rev. B

Scientific paper

10.1103/PhysRevB.76.161306

We study fluctuations and topological melting transitions of quantum Hall stripes near half-filling of intermediate Landau levels. Taking the stripe state to be an anisotropic Wigner crystal (AWC) allows us to identify the quantum Hall nematic state conjectured in previous studies of the 2D electron gas as an {\em anisotropic hexatic}. The transition temperature from the AWC to the quantum Hall nematic state is explicitly calculated, and a tentative phase diagram for the 2D electron gas near half-filling is suggested.

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