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On the dynamics of a quantum system which is classically chaotic

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Zeitschrift für Physik B Condensed Matter

Abstract

We investigate the dynamics of one anisotropic spin in an external time-dependent magnetic field. The classical dynamics of the system is nonintegrable (and very similar to the standard map). We present results on this model for a quantum spin (i.e. for finite values of the spin lengthS). In particular we discuss the semiclassical regime,S≫1, using the concept of Wigner functions to define a suitable probability distribution. In regular regions of phase space the time evolution of the probability distribution shows an algebraic decay of correlations as in quantum mechanics. In chaotic regions of phase space it is characterised by a positive Lyapunov exponent which depends onS. In these regions semiclassical trajectories coincide with classical ones fort <τ0 where τ0∼InS.

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Authors and Affiliations

  1. Institut für Theoretische Physik, Universität Hannover, Appelstrasse 2, D-3000, Hannover 1, Federal Republic of Germany

    H. Frahm & H. J. Mikeska

Authors
  1. H. Frahm
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  2. H. J. Mikeska
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Frahm, H., Mikeska, H.J. On the dynamics of a quantum system which is classically chaotic. Z. Physik B - Condensed Matter 60, 117–126 (1985). https://doi.org/10.1007/BF01312650

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  • DOI: https://doi.org/10.1007/BF01312650

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