| Issue |
Europhys. Lett.
Volume 47, Number 2, July II 1999
|
|
|---|---|---|
| Page(s) | 164 - 170 | |
| Section | General | |
| DOI | https://doi.org/10.1209/epl/i1999-00367-8 | |
| Published online | 01 September 2002 | |
Relaxation and aging in quantum spin systems
1
Institut für Festkörperforschung, Forschungszentrum Jülich - D-52425 Jülich, Germany
2
Fachbereich Physik, Martin-Luther-Universität - D-06099 Halle, Germany
Received:
9
April
1999
Accepted:
4
May
1999
The nonthermal quantum relaxation of the magnetization under nonequilibrium initial conditions is studied for the transverse Ising chain and for the one-dimensional isotropic XY model. In the absence of a heat bath the transverse Ising system exhibits an oscillating relaxation with a decaying amplitude. At the critical transverse field some stationary properties become independent of the initial state. The isotropic XY chain with a spatially inhomogeneous initial state shows a slow, modulated algebraic decay of the magnetization. Analysis of the two-time autocorrelation function reveals the phenomenon of aging.
PACS: 05.70.Ln – Nonequilibrium and irreversible thermodynamics / 05.30.-d – Quantum statistical mechanics / 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
© EDP Sciences, 1999
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