Unconventional critical activated scaling of two-dimensional quantum spin-glasses

Abstract

We study the critical behavior of two-dimensional short-range quantum spin glasses by numerical simulations. Using a parallel tempering algorithm, we calculate the Binder cumulant for the Ising spin glass in a transverse magnetic field with two different short-range bond distributions, the bimodal and the Gaussian ones. Through an exhaustive finite-size scaling analysis, we show that the universality class does not depend on the exact form of the bond distribution but, most important, that the quantum critical behavior is governed by an infinite randomness fixed point.

6 pages, 6 figures

References in corpus (2)

• Real-space renormalization-group approach to the random transverse-field Ising model in finite dimensions
• Block Renormalization for quantum Ising models in dimension $d=2$ : applications to the pure and random ferromagnet, and to the spin-glass

Cited by in corpus (10)

• Quantum critical dynamics in a 5000-qubit programmable spin glass
• Quantum Annealing: An Overview
• The Quantum Transition of the Two-Dimensional Ising Spin Glass: A Tale of Two Gaps
• Critical and Griffiths-McCoy singularities in quantum Ising spin-glasses on d-dimensional hypercubic lattices: A series expansion study
• Reentrant Random Quantum Ising Antiferromagnet
• Transverse-spin correlations of the random transverse-field Ising model
• Finite-size scaling analysis of the two-dimensional random transverse-field Ising ferromagnet
• Changing the universality class of the three-dimensional Edwards-Anderson spin-glass model by selective bond dilution
• Energy gap of quantum spin glasses: a projection quantum Monte Carlo study
• Geometry of rare regions behind Griffiths singularities in random quantum magnets