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Quantum phase transition in spin glasses with multi-spin interactions

机译:具有多轴相互作用的自旋玻璃中的量子相变

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We examine the phase diagram of the p-interaction spin glass model in a transverse field. We consider a spherical version of the model and compare with results obtained in the Ising case. The analysis of the spherical model, with and without quantization, reveals a phase diagram very similar to that obtained in the Ising case. In particular, using the static approximation, reentrance is observed at low temperatures in both the quantum spherical and Ising models. This is an artifact of the approximation and disappears when the imaginary time dependence of the order parameter is taken into account. The resulting phase diagram is checked by accurate numerical investigation of the phase boundaries. (C) 1998 Published by Elsevier Science B.V. All rights reserved. [References: 58]
机译:我们在横向场中检查了p相互作用自旋玻璃模型的相图。我们考虑模型的球形形式,并与在伊辛案例中获得的结果进行比较。通过对球形模型的分析(带和不带量化),发现了与伊辛情况下非常相似的相图。特别是,使用静态逼近,在量子球形模型和伊辛模型中均在低温下观察到重入。这是一种近似的伪像,当考虑到阶数参数的虚时依赖性时,该伪像就消失了。通过对相位边界进行精确的数值检查,可以检查得到的相位图。 (C)1998,Elsevier Science B.V.保留所有权利。 [参考:58]

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