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Journal of Magnetism and Magnetic Materials

Instability in the quantum Sherrington-Kirkpatrick Ising spin glass with a transverse and a trimodal random longitudinal field

Yu‐qiang Ma, Zhen‐Ya Li

Published Jun 1, 1991• 0 citations
Publisher
DOI
10.1016/0304-8853(91)90645-q

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The infinite-range quantum Ising spin glass in transverse ($\ensuremath{\Gamma}$) and longitudinal (hhh) fields is studied by means of thermo-field-dynamics as a substitute for the nnn-replica trick. With the use of a one-loop approximation for the dynamic self-interaction the stability of the mean-field-type solution against the action of fluctuations is investigated in the parameter space (${k}_{B}T, \ensuremath{\Gamma}, h$).
I study in detail the quantum Sherrington-Kirkpatrick (SK) model, i.e., the infinite-range Ising spin glass in a transverse field, by solving numerically the effective one-dimensional model that the quantum SK model can be mapped to in the thermodynamic limit. I find that the replica symmetric solution is unstable down to zero temperature, in contrast to some previous claims, and so there is not only a line of transitions in the (longitudinal) field-temperature plane (the de Almeida-Thouless, AT, line) where replica symmetry is broken, but also a quantum de Almeida-Thouless (QuAT) line in the transverse field-longitudinal field plane at T=0. If the QuAT line also occurs in models with short-range interactions its presence might affect the performance of quantum annealers when solving spin glass-type problems with a bias (i.e., magnetic field).