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

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<mark>Journal publication date</mark>11/01/1999
<mark>Journal</mark>Physical review letters
Issue number2
Number of pages4
Pages (from-to)402-405
<mark>Original language</mark>English


It is shown that the low-energy spectrum of a ferromagnetic quantum Hall liquid in a system with a multidomain structure generated by an inhomogeneous bare Zeeman splitting epsilon(z) is formed by excitations localized at the walls between domains. For a steplike 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 low-energy topological defects. The latter are charged and may dominate the transport under conditions that allow percolation through the network of domain walls.