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Temperature dependence of the anomaly in the excitation spectrum of the 2D quantum Heisenberg antiferromagnet
W. Wan, N. B. Christensen, A. W. Sandvik +7
It is well established that in the low-temperature limit, the two-dimensional quantum Heisenberg antiferromagnet on a square lattice (2DQHAFSL) exhibits an anomaly in its spectrum…
Existence of a Spectral Gap in the Affleck-Kennedy-Lieb-Tasaki Model on the Hexagonal Lattice
Marius Lemm, Anders W. Sandvik, Ling Wang
The Affleck-Kennedy-Lieb-Tasaki (AKLT) quantum spin chain was the first rigorous example of an isotropic spin system in the Haldane phase. The conjecture that the AKL…
Hilbert Space Fragmentation and Ashkin-Teller Criticality in Fluctuation Coupled Ising Models
Pranay Patil, Anders W. Sandvik
We discuss the effects of exponential fragmentation of the Hilbert space on phase transitions in the context of coupled ferromagnetic Ising models in arbitrary dimension with speci…
Comment on "Gapless spin liquid ground state of the spin- - Heisenberg model on square lattices"
Bowen Zhao, Jun Takahashi, Anders W. Sandvik
Liu et al. [Phys.Rev.B 98, 241109 (2018)] used Monte Carlo sampling of the physical degrees of freedom of a Projected Entangled Pair State (PEPS) type wave function for the …
Stochastic Series Expansion Methods
Anders W. Sandvik
The Stochastic Series Expansion (SSE) technique is a quantum Monte Carlo method that is especially efficient for many quantum spin systems and boson models. It was the first generi…
Scaling and diabatic effects in quantum annealing with a D-Wave device
Phillip Weinberg, Marek Tylutki, Jami M. Rönkkö +5
We discuss quantum annealing of the two-dimensional transverse-field Ising model on a D-Wave device, encoded on lattices with . Analyzing the residual energy…