Exact ground states of a frustrated 2D magnet: Deconfined fractional excitations at a first-order quantum phase transition

被引：36

作者：

Batista, CD ^{[1
]}

Trugman, SA ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.93.217202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We introduce a frustrated spin 1/2 Hamiltonian which is an extension of the two dimensional J(1)-J(2) Heisenberg model. The ground states of this model are exactly obtained at a first-order quantum phase transition between two valence bond crystals. At this point, the low energy excitations are deconfined spinons and spin-charge separation occurs under doping in the limit of low concentration of holes. In addition, this point is characterized by the proliferation of topological defects.

引用

页码：217202 / 1

页数：4

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