EFFECTIVE FIELD THEORY APPROACH TO FERROMAGNETS AND ANTIFERROMAGNETS IN CRYSTALLINE SOLIDS
EFFECTIVE FIELD THEORY APPROACH TO FERROMAGNETS AND ANTIFERROMAGNETS IN CRYSTALLINE SOLIDS
We present a systematic construction of effective Lagrangians for the low energy and momentum region of ferromagnetic and antiferromagnetic spin waves in crystalline solids. We fully exploit the spontaneous symmetry breaking pattern SU(2)→U(1), the fact that spin waves are its associated Goldstone modes, the crystallographic space group and time reversal …