Extended spin waves in aperiodic ferromagnetic chains

F. A.B.F. de Moura ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2007, vol. 58, issue 4, 389-393

Abstract: In this work, a one-dimensional quantum Heisenberg ferromagnet with aperiodic exchange couplings is considered. To produce an aperiodic distribution of exchange couplings, it is used a sinusoidal function whose phase φ varies as a power-law, φ∝n ν , where n labels the positions along the chain. By using exact diagonalization, the spin-wave participation number and the local density of states are computed. The numerical calculations indicate that for 0 > ν > 1, this ferromagnetic system displays a phase of extended spin waves in the low-energy region. For ν > 1 all spin waves are localized except for the zero energy mode. By integrating the time-dependent Schrödinger equation, the temporal evolution of the mean-square displacement of the wave-packet was followed. Associated with the emergence of extended spin waves, it was observed that the wave-packet mean-square displacement displays a ballistic spread. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Keywords: 75.30.Ds Spin waves; 73.23.Ad Ballistic transport; 73.20.Jc Delocalization processes; 72.15.Rn Localization effects (Anderson or weak localization) (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1140/epjb/e2007-00245-9

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