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American Physical Society, Physical Review Letters, 4(85), p. 840-843, 2000

DOI: 10.1103/physrevlett.85.840

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Mean Field Theory of a Quantum Heisenberg Spin Glass

Journal article published in 2000 by Antoine Georges ORCID, Olivier Parcollet ORCID, Subir Sachdev
This paper is available in a repository.
This paper is available in a repository.

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Abstract

A full mean-field solution of a quantum Heisenberg spin-glass model is presented in a large- N limit. A spin-glass transition is found for all values of the spin S. The quantum critical regime associated with the quantum transition at S = 0 and the various regimes in the spin-glass phase at high spin are analyzed. The specific heat is shown to vanish linearly with temperature. In the spin-glass phase, intriguing connections between the equilibrium properties of the quantum problem and the out-of-equilibrium dynamics of classical models are pointed out.