The authors prove the location of the quantum Almeida-Thouless line by establishing a simplified Parisi variational principle for the quantum pressure in the self-overlap-corrected quantum SK model.
Replica symmetry up to the de Almeida-Thouless line in the Sherrington-Kirkpatrick model
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abstract
We show that in the Sherrington-Kirkpatrick model at inverse temperature $\beta$ with uniform external field $h>0$, replica symmetry holds in the regime $ \beta^2\mathrm{E}[ \mathrm{sech}^4(\beta\sqrt{q}Z+h)] \le 1$, where $Z$ is a standard Gaussian random variable. This confirms a prediction of de Almeida and Thouless (1978). The proof proceeds by a direct analysis of the Parisi measure using the characterization provided by Jagannath and Tobasco (2017).
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The quantum Almeida-Thouless line in the self-overlap-corrected quantum Sherrington-Kirkpatrick model
The authors prove the location of the quantum Almeida-Thouless line by establishing a simplified Parisi variational principle for the quantum pressure in the self-overlap-corrected quantum SK model.