Coherent spin-current oscillations in transverse magnetic fields

Details Coherent spin-current oscillations in transverse magnetic fields Coherent spin-current oscillations in transverse magnetic fields

2010-10-12

arxiv.org/abs/1010.2351v2

Phys. Rev. Lett. 106, 160602 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures (and supplemental material: 4 pages, 6 figures)

Scientific paper

10.1103/PhysRevLett.106.160602

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.

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