Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series LPTMS
Subjects cond-mat.stat-mech
Date Tuesday 23 January 2024
Time 11:00
Institute LPTMS
Seminar Room Salle des séminaires du FAST et du LPTMS, bâtiment Pascal n°530
Speaker's Last Name Mueller
Speaker's First Name Markus
Speaker's Email Address
Speaker's Institution PSI Villigen
Title Exact solution of the classical and quantum Heisenberg mean field spin glasses
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
arXiv Preprint Number

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