Polaronic Aspects of the two-dimensional Ferromagnetic Kondo Model

Abstract

The 2D ferromagnetic Kondo model with classical corespins is studied for a hole doping up to x = 0.125 via unbiased Monte Carlo (MC) simulations. A canonical algorithm for finite temperatures is developed. We show that with realistic parameters for the manganites and at low temperatures, the double-exchange mechanism does not lead to phase separation on a two-dimensional lattice but rather stabilizes individual ferromagnetic polarons. A detailed analysis of unbiased MC results reveals that the polarons can be treated as independent particles. It is found that a simple polaron model perfectly describes the physics of the FM Kondo model. The ferromagnetic polaron picture provides an obvious explanation for the pseudogap in the one-particle spectral function $A_k(\omega )$ observed in the FM Kondo model.

arXiv comment15 pages, 9 figures; 1 new figure, additional references cited

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Cited by in corpus (5)

• Spectral properties of orbital polarons in Mott insulators
• Arrested phase separation in double-exchange models: machine-learning enabled large-scale simulation
• Ferromagnetic polarons in the one-dimensional ferromagnetic Kondo model with quantum mechanical S=3/2 core spins
• Single particle spectrum of the flux phase in the FM Kondo Model
• Aspects of the FM Kondo Model: From Unbiased MC Simulations to Back-of-an-Envelope Explanations