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

Phys. Rev. B 96, 134309 (2017)

2017年10月18日(水)

Takuya Hatomura, Bernard Barbara, and Seiji Miyashita ( https://doi.org/10.1103/PhysRevB.96.134309 )

Abstract

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.

その他特記事項

This work is supported by Grants-in-Aid for ScientificResearch C (Grant No. 25400391) from MEXT of Japanand the Elements Strategy Initiative Center for MagneticMaterials under the outsourcing project of MEXT. Thenumerical calculations were supported by the supercom-puter center of ISSP of the University of Tokyo. T. H. issupported by the Program for Leading Graduate Schools:Material Education program for the future leaders in Re-search, Industry, and Technology (MERIT) from JSPS.



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