Topological defects and Goldstone excitations in domain walls between ferromagnetic quantum Hall effect liquids

Details Topological defects and Goldstone excitations in domain walls between ferromagnetic quantum Hall effect liquids Topological defects and Goldstone excitations in domain walls between ferromagnetic quantum Hall effect liquids

1999-01-07

arxiv.org/abs/cond-mat/9901053v1

PRL 82, 402 (1999)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 1 fig

Scientific paper

10.1103/PhysRevLett.82.402

It is shown that the low-energy spectrum of a ferromagnetic quantum Hall effect liquid in a system with a multi-domain structure generated by an inhomogeneous bare Zeeman splitting $\epsilon_{Z}$ is formed by excitations localized at the walls between domains. For a step-like $\epsilon_Z(r)$, the domain wall spectrum includes a spin-wave with a linear dispersion and a small gap due to spin-orbit coupling, and a low-energy topological defects. The latter are charged and may dominate in the transport under conditions that the percolation through the network of domain walls is provided.

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