Topological Defects and Goldstone Excitations in Domain Walls between Ferromagnetic Quantum Hall Liquids

Vladimir I. Fal'ko; S. V. Iordanskii

Topological Defects and Goldstone Excitations in Domain Walls between Ferromagnetic Quantum Hall Liquids

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Abstract

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 ε_Z is formed by excitations localized at the walls between domains. For a steplike ε_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.

Original language	English
Pages (from-to)	402-405
Number of pages	4
Journal	Physical Review Letters
Volume	82
Issue number	2
Publication status	Published - 11 Jan 1999

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abstract = "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 εZ is formed by excitations localized at the walls between domains. For a steplike εZ(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.",

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N2 - 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 εZ is formed by excitations localized at the walls between domains. For a steplike εZ(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.

AB - 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 εZ is formed by excitations localized at the walls between domains. For a steplike εZ(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.

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Topological Defects and Goldstone Excitations in Domain Walls between Ferromagnetic Quantum Hall Liquids

Abstract

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