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Spin textures and spin-wave excitations in doped Dirac-Weyl semimetals

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arxiv 1511.08381 v1 pith:H53HLQIM submitted 2015-11-26 cond-mat.mes-hall

Spin textures and spin-wave excitations in doped Dirac-Weyl semimetals

classification cond-mat.mes-hall
keywords correlationferromagneticmagneticspintexturesanisotropicdiracdoped
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study correlations and magnetic textures of localized spins, doped in three-dimensional Dirac semimetals. An effective field theory for magnetic moments is constructed by integrating out the fermionic degrees of freedom. The spin correlation shows a strong anisotropy, originating from spin-momentum locking of Dirac electrons, in addition to the conventional Heisenberg-like ferromagnetic correlation. The anisotropic spin correlation allows topologically nontrivial magnetic excitation textures such as a transient hedgehog state, as well as the ferromagnetic ground state. The spin-wave dispersion in ferromagnetic Weyl semimetal also becomes anisotropic, being less dispersed perpendicular to the magnetization.

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