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

Domain walls in a one-dimensional gapped easy-axis ferro mag net 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 resul...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-03, Vol.85 (10), Article 104408
Main Authors: Shinkevich, Sergey, Syljuåsen, Olav F.
Format: Article
Language:English
Subjects:
Approximation
Condensed matter
Couplings
Exchange
Magnetic fields
Mathematical analysis
Oscillations
Spectral signatures
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Summary:Domain walls in a one-dimensional gapped easy-axis ferro mag net 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 CoCl sub(2) times 2H sub(2)O.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.85.104408