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Abstract |
While the physics of classical and quantum Ising spin glasses has been rather thoroughly understood, glasses
of Heisenberg (vector) spins have remained a difficult and largely unsolved problem, including especially its
quantum version, which governs the local moments in randomly doped, strongly correlated materials. I will
present the numerically exact mean field solution of quantum and classical Heisenberg spin glasses, based
on the combination of a high precision numerical solution of the Parisi full replica symmetry breaking
equations and a continuous time Quantum Monte Carlo. We find that the Heisenberg (vector) spin glasses
have a rougher energy landscape than their Ising analogues, which affects their avalanche response to
external stimuli. The (short time) quantum dynamics and collective excitations exhibit a surprisingly slow
temperature evolution, that, at asymptotically low temperatures, tend to the superuniversal form found so far
in all insulating mean field glasses. We extend our analysis to the doped, metallic Heisenberg spin glass,
which displays an unexpectedly slow spin dynamics reflecting the proximity to the melting quantum critical
point and its associated Sachdev-Ye-Kitaev Planckian dynamics.
Ref: N. Kavokine, M. Müller, A. Georges, and O. Parcollet https://doi.org/10.48550/arXiv.2312.14598 |
