TWA versus semiclassical unitary approximation for spin-like systems

We analyze the stable and unstable evolution of spin-like systems in the framework of the Truncated Wigner and Unitary Approximations, and test the dependence of the time scale where the classical evolution determines the dynamics of a quantum system on the semiclassical parameter. •Semiclassical un...

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Veröffentlicht in:Annals of physics 2017-08, Vol.383, p.620-634
Hauptverfasser: Valtierra, I.F., Romero, J.L., Klimov, A.B.
Format: Artikel
Sprache:eng
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Zusammenfassung:We analyze the stable and unstable evolution of spin-like systems in the framework of the Truncated Wigner and Unitary Approximations, and test the dependence of the time scale where the classical evolution determines the dynamics of a quantum system on the semiclassical parameter. •Semiclassical unitary approach (SUA) is applied for analysis of large-spin dynamics.•Stable and unstable evolution of spin systems in the semiclassical limit is discussed.•A comparative analysis of SUA and Truncated Wigner Approximation is performed.
ISSN:0003-4916
1096-035X
DOI:10.1016/j.aop.2017.06.006