Nonrelativistic nambu-goldstone modes associated with spontaneously broken space-time and internal symmetries

Michikazu Kobayashi, Muneto Nitta

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

We show that a momentum operator of a translational symmetry may not commute with an internal symmetry operator in the presence of a topological soliton in nonrelativistic theories. As a striking consequence, there appears a coupled Nambu-Goldstone mode with a quadratic dispersion consisting of translational and internal zero modes in the vicinity of a domain wall in an O(3) σ model, a magnetic domain wall in ferromagnets with an easy axis.

Original languageEnglish
Article number120403
JournalPhysical review letters
Volume113
Issue number12
DOIs
Publication statusPublished - 2014 Sep 18

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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