Coherent spin-current oscillations in transverse magnetic fields
Strongly Correlated Electrons
2011-06-10 v2
Abstract
We address the coherence of the dynamics of spin-currents with components transverse to an external magnetic field for the spin-1/2 Heisenberg chain. We study current autocorrelations at finite temperatures and the real-time dynamics of currents at zero temperature. Besides a coherent Larmor oscillation, we find an additional collective oscillation at higher frequencies, emerging as a coherent many-magnon effect at low temperatures. Using numerical and analytical methods, we analyze the oscillation frequency and decay time of this coherent current-mode versus temperature and magnetic field.
Keywords
Cite
@article{arxiv.1010.2351,
title = {Coherent spin-current oscillations in transverse magnetic fields},
author = {R. Steinigeweg and S. Langer and F. Heidrich-Meisner and I. P. McCulloch and W. Brenig},
journal= {arXiv preprint arXiv:1010.2351},
year = {2011}
}
Comments
4 pages, 5 figures (and supplemental material: 4 pages, 6 figures)