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

2007/06/25 by E. Orignac, R. Citro, Sylvain Capponi +3 · 1 citation
Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Breather #Condensed matter physics #Excitation #Field (mathematics) #Magnetic field #Mathematics #Nonlinear system #Observable #Phase (matter) #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #Raman scattering #Raman spectroscopy #Scattering #Skyrmion #Spin (aerodynamics) #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.76.144422

published as Phys. Rev. B 76 144422 (2007) · RevTeX 4, 14 pages, 11 EPS figures

arxiv created 2007/06/25 · openalex publication_date 2007/10/17 · arxiv updated 2011/11/09 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Recent experiments have revealed the role of the staggered Dzyaloshinskii-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 Dzyaloshinskii-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 Dzyaloshinskii-Moriya interaction using exact diagonalizations.

Citations

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