Double-layer quantum Hall antiferromagnetism at filling fraction nu=2/(odd integer)

الأصل · EN

A low energy action for double-layer quantum Hall systems at filling fractions ν= 2/m (m an odd integer) is introduced. Interlayer antiferromagnetic exchange induces a phase with canted spin order, and also a spin-singlet phase. Universal properties of zero and finite temperature transitions are obtained. We compute the critical temperature at which the canted order vanishes in a Kosterlitz-Thouless transition. Implications for recent light scattering experiments at ν= 2 are noted.