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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2007

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

Résumé

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.

Dates et versions

hal-00166733 , version 1 (09-08-2007)

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Citer

Edmond Orignac, R. Citro, Sylvain Capponi, Didier Poilblanc. Breathers and Raman scattering in a two-leg ladder with staggered Dzialoshinskii-Moriya interaction. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2007, 76, pp.144422. ⟨10.1103/PhysRevB.76.144422⟩. ⟨hal-00166733⟩
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