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VOLUME 60 (1994) | ISSUE 8 | PAGE 563
Antichirality and elementary excitations of effectively 2D quantum frustrated antiferromagnetic systems
An exactly solvable 2D quantum spin model is analyzed. It is shown that elementary excitations carry a nonzero spin chirality (a topological charge), but only pairs of these excitations with opposite chirality contribute to the thermodynamics, so the system is always in an antichiral spin state. It is suggested that the elementary excitations of the quantum antiferromagnet discussed here are massive if there are no topological terms in the Hamiltonian. © 1994 American Institute of Physics.