Distribution of eigenstate populations and dissipative beating dynamics in uniaxial single-spin magnets

Article

关键词: MOLECULAR NANOMAGNETS;    MN-12 ACETATE;    MAGNETIZATION;    FIELD;    COHERENCE;    PARTICLES;    CRYSTAL;    SYSTEMS;   

DOI  :  10.1103/PhysRevB.96.134309

来源: SCIE

【 摘 要 】

Numerical simulations of magnetization reversal of a quantum uniaxial magnet under a swept magnetic field [Hatomura et al., Phys. Rev. Lett. 116, 037203 (2016)] are extended. In particular, how the wave packet describing the time evolution of the system is scattered in the successive avoided level crossings is investigated from the viewpoint of the distribution of the eigenstate populations. It is found that the peak of the distribution as a function of the magnetic field does not depend on spin-size S, which indicates that the delay of magnetization reversal due to the finite sweeping rate is the same in both the quantum and classical cases. The peculiar synchronized oscillations of all the spin components result in the beating of the spin length. Here, dissipative effects on this beating are studied by making use of the generalized Lindblad-type master equation. The corresponding experimental situations are also discussed in order to find conditions for experimental observations.

【 授权许可】

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