Low-temperature evolution of the spectral weight of a spin-up carrier moving in a ferromagnetic background

Abstract

We derive the lowest-temperature correction to the self-energy of a spin-up particle injected in a ferromagnetic background. The background is modeled with both Heisenberg and Ising Hamiltonians so that differences due to gapless vs. gapped magnons can be understood. Beside the expected thermal broadening of the quasiparticle peak as it becomes a resonance inside a continuum, we also find that spectral weight is transferred to regions lying outside this continuum. We explain the origin of this spectral weight transfer and its low-temperature evolution.

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Cited by in corpus (3)

• Local environment effects on a charge carrier injected into an Ising chain
• On the equivalence of models with similar low-energy quasiparticles
• Charge carrier relaxation dynamics in the one-dimensional Kondo lattice model