Decay of quasiparticles in quantum spin liquids

Details Decay of quasiparticles in quantum spin liquids Decay of quasiparticles in quantum spin liquids

2006-01-18

arxiv.org/abs/cond-mat/0601405v1

Phys. Rev. B 73, 100404 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures

Scientific paper

10.1103/PhysRevB.73.100404

Magnetic excitations are studied in gapped quantum spin systems, for which spontaneous two-magnon decays are allowed by symmetry. Interaction between one- and two-particle states acquires nonanalytic frequency and momentum dependence near the boundary of two-magnon continuum. This leads to a termination point of single-particle branch for one-dimensional systems and to strong suppression of quasiparticle weight in two dimensions. The momentum dependence of the decay rate is calculated in arbitrary dimensions and effect of external magnetic field is discussed.

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