Using a two-dimensional quantum spin-1/2 model as a concrete example, we studied the relation between gapless fermionic excitations (spinons) and quantum orders in some spin liquid states. Using a winding number, we find that the projective symmetry group characterizing the quantum order can directly determine the pattern of Fermi points in the Brillouin zone. Thus quantum orders provide an origin for gapless fermionic excitations. Gapless fermions can appear even from a pure boson system as long as the boson ground state has a proper quantum order.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据