Spin textures, screening and excitations in dirty quantum Hall ferromagnets

Details Spin textures, screening and excitations in dirty quantum Hall ferromagnets Spin textures, screening and excitations in dirty quantum Hall ferromagnets

2001-09-18

arxiv.org/abs/cond-mat/0109326v1

Phys. Rev. Lett. 88, 036801 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.88.036801

We study quantum Hall ferromagnets in the presence of a random electrostatic impurity potential. Describing these systems with a classical non-linear sigma model and using analytical estimates supported by results from numerical simulations, we examine the nature of the ground state as a function of disorder strength, $\Delta$, and deviation, $\delta \nu$, of the average Landau level filling factor from unity. Screening of an impurity potential requires distortions of the spin configuration, and in the absence of Zeeman coupling there is a disorder-driven, zero-temperature phase transition from a ferromagnet at small $\Delta$ and $|\delta \nu|$ to a spin glass at larger $\Delta$ or $|\delta \nu|$. We examine ground-state response functions and excitations.

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