Spectral signatures of magnetic Bloch oscillations in one-dimensional easy-axis ferromagnets

Domain walls in a one-dimensional gapped easy-axis ferromagnet can exhibit Bloch oscillations in an applied magnetic field. We investigate how exchange couplings modify this behavior within an approximation based on noninteracting domain-wall bound states. In particular, we obtain analytical results...

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Bibliographic Details
Published in:arXiv.org 2012-03
Main Authors: Shinkevich, Sergey, Syljuåsen, Olav F
Format: Article
Language:English
Subjects:
Approximation
Couplings
Domain walls
Energy levels
Ferromagnetism
Magnetism
Mathematical analysis
Oscillations
Spectral signatures
Structure factor
Online Access:Get full text
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Summary:Domain walls in a one-dimensional gapped easy-axis ferromagnet can exhibit Bloch oscillations in an applied magnetic field. We investigate how exchange couplings modify this behavior within an approximation based on noninteracting domain-wall bound states. In particular, we obtain analytical results for the spectrum and the dynamic structure factor, and show where in momentum space to expect equidistant energy levels, the Wannier-Zeeman ladder, which is the spectral signature of magnetic Bloch oscillations. We compare our results to previous calculations employing a single domain-wall approximation, and make predictions relevant for the material \(CoCl2\cdot2H2O\).
ISSN:2331-8422
DOI:10.48550/arxiv.1112.6195