期刊
PHYSICAL REVIEW LETTERS
卷 93, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.93.217202
关键词
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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.
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