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cond-mat.dis-nn2026
Vanishing spin stiffness in weakly disordered two-dimensional Heisenberg ferromagnets
Jacopo Niedda, Aldo Coraggio, Giacomo Bracci-Testasecca +1
We show that a small fraction of antiferromagnetic bonds qualitatively alters the long-wavelength dynamics of two-dimensional Heisenberg ferromagnets. Although the classical ground…
cond-mat.dis-nn2026
Semiclassical picture of the Heisenberg spin glass in two dimensions: from weak localization to hydrodynamics
Giacomo Bracci-Testasecca, Jacopo Niedda, Aldo Coraggio +2
The two-dimensional Heisenberg spin-glass model is investigated by means of a semiclassical expansion around classical states. At leading order, we obtain an effective quadratic sp…