Breathers and Raman scattering in a two-leg ladder with staggered Dzialoshinskii-Moriya interaction

Abstract

Recent experiments have revealed the role of staggered Dzialoshinskii-Moriya interaction in the magnetized phase of an antiferromagnetic spin 1/2 two-leg ladder compound under a uniform magnetic field. We derive a low energy effective field theory describing a magnetized two-leg ladder with a weak staggered Dzialoshinskii-Moriya interaction. This theory predicts the persistence of the spin gap in the magnetized phase, in contrast to standard two-leg ladders, and the presence of bound states in the excitation spectrum. Such bound states are observable in Raman scattering measurements. These results are then extended to intermediate Dzialoshinskii-Moriya interaction using Exact Diagonalizations.

RevTeX 4, 14 pages, 11 EPS figures

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Cited by in corpus (7)

• Modulation of breathers in cigar-shaped Bose-Einstein condensates
• Elementary excitations of S=1/2 one-dimensional antiferromagnet KCuGaF6 in magnetic field and quantum sine-Gordon model
• Anisotropy of Magnetic Interactions in the Spin-Ladder Compound (C${}_5$H${}_{12}$N)${}_2$CuBr${}_4$
• Modulation of breathers in the three-dimensional nonlinear Gross-Pitaevskii equation
• Thermodynamic properties of quantum sine-Gordon spin chain system KCuGaF6
• Dynamical response functions in the quantum Ising chain with a boundary
• Theory of Raman Scattering in One-Dimensional Quantum Spin-1/2 Antiferromagnets