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APS » Journals » Phys. Rev. Lett. » Volume 106 » Issue 16
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Phys. Rev. Lett. 106, 160602 (2011) [4 pages]

Coherent Spin-Current Oscillations in Transverse Magnetic Fields

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Robin Steinigeweg1,*, Stephan Langer2, Fabian Heidrich-Meisner2, Ian P. McCulloch3, and Wolfram Brenig1
1Institute for Theoretical Physics, Technical University Braunschweig, D-38106 Braunschweig, Germany
2Department of Physics and Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, D-80333 München, Germany
3School of Physical Sciences, The University of Queensland, Brisbane, QLD 4072, Australia

Received 12 October 2010; revised 25 March 2011; published 20 April 2011

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.

© 2011 American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.106.160602
DOI:
10.1103/PhysRevLett.106.160602
PACS:
05.60.Gg, 71.27.+a, 75.10.Jm

*r.steinigeweg@tu-bs.de

 
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