We study for random quantum spin systems the energy gap between the ground and first excited states to clarify a relation to the spin-glass–paramagnetic phase transition. We find that for the transverse Sherrington-Kirkpatrick model the vanishing of the averaged gap does not identify the transition. A power-law form of the gap distribution function leads to… (More)

Quantum Many-Particle Systems (Reading, MA: Addison-Wesley

W Negele J, H Orland

1988

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@inproceedings{Takahashi2010EnergygapAO,
title={Energy-gap analysis of quantum spin-glass transitions at zero temperature},
author={Kazutaka Takahashi and Yoshiki Matsuda},
year={2010}
}