Boundaries, Cusps and Caustics in the Multimagnon Continua of 1D Quantum Spin Systems

Details Boundaries, Cusps and Caustics in the Multimagnon Continua of 1D Quantum Spin Systems Boundaries, Cusps and Caustics in the Multimagnon Continua of 1D Quantum Spin Systems

2002-04-04

arxiv.org/abs/cond-mat/0204115v1

Physics

Condensed Matter

Strongly Correlated Electrons

18 pages, 10 figures

Scientific paper

10.1103/PhysRevB.67.024412

The multimagnon continua of 1D quantum spin systems possess several interesting singular features that may soon be accessible experimentally through inelastic neutron scattering. These include cusps and composition discontinuities in the boundary envelopes of two-magnon continuum states and discontinuities in the density of states, "caustics", on and within the continuum, which will appear as discontinuities in scattering intensity. In this note we discuss the general origins of these continuum features, and illustrate our results using the alternating Heisenberg antiferromagnetic chain and two-leg ladder as examples.

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