TY - JOUR
T1 - Nonrelativistic nambu-goldstone modes associated with spontaneously broken space-time and internal symmetries
AU - Kobayashi, Michikazu
AU - Nitta, Muneto
N1 - Publisher Copyright:
© 2014 American Physical Society.
PY - 2014/9/18
Y1 - 2014/9/18
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.113.120403
DO - 10.1103/PhysRevLett.113.120403
M3 - Article
AN - SCOPUS:84907246938
SN - 0031-9007
VL - 113
JO - Physical Review Letters
JF - Physical Review Letters
IS - 12
M1 - 120403
ER -