PHYSICAL REVIEW B 92, 155201 (2015)

ISSN: 1098-0121, SCI

Spin dynamics in paramagnetic diluted magnetic semiconductors

Van-Nham Phan and Minh-Tien Tran

Microscopic properties of low-energy spin dynamics in diluted magnetic semiconductor are addressed in a framework of the Kondo lattice model including random distribution of magnetic dopants. Based on the fluctuation-dissipation theorem, we derive an explicit dependence of the spin diffusion coefficient on the singleparticle Green function which is directly evaluated by dynamical mean-field theory. In the paramagnetic state, the magnetic scattering has been manifested to suppress spin diffusion. In agreement with other ferromagnet systems, we also point out that the spin diffusion in dilutedmagnetic semiconductors at small carrier concentration displays a monotonic 1/T -like temperature dependence. By investigating the spin diffusion coefficient on a wide range of the model parameters, the obtained results have provided a significant scenario to understand the spin dynamics in the paramagnetic diluted magnetic semiconductors.

DOI: 10.1103/PhysRevB.92.155201

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