Exact ground states of a frustrated 2D magnet: deconfined fractional excitations at a first-order quantum phase transition |
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Authors: | Batista C D Trugman S A |
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Affiliation: | Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. |
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Abstract: | We introduce a frustrated spin 1/2 Hamiltonian which is an extension of the two dimensional J1-J2 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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