期刊
PHYSICAL REVIEW LETTERS
卷 90, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.90.016803
关键词
-
We find all the exact eigenstates and eigenvalues of a spin-1/2 model on square lattice: H=16gSigma(i)S(i)(y)S(i+(x) over cap)(x)S(i+(x) over cap+(y) over cap)(y)S(i+(y) over cap)(x).We show that the ground states for g<0 and g>0 have different quantum orders described by Z2A and Z2B projective symmetry groups. The phase transition at g=0 represents a new kind of phase transition that changes quantum orders but not symmetry. Both the Z2A and Z2B states contain Z(2) lattice gauge theories at low energies. They have robust topologically degenerate ground states and gapless edge excitations.
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