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Typicality at quantum-critical points
Lu Liu, Anders W. Sandvik, WenAn Guo
We discuss the concept of typicality of quantum states at quantum-critical points, using projector Monte Carlo simulations of an bilayer Heisenberg antiferromagnet as an il…
Symmetry enhanced first-order phase transition in a two-dimensional quantum magnet
Bowen Zhao, Phillip Weinberg, Anders W. Sandvik
Theoretical studies of quantum phase transitions have suggested critical points with higher symmetries than those of the underlying Hamiltonian. Here we demonstrate a surprising em…
Random-Singlet Phase in Disordered Two-Dimensional Quantum Magnets
Lu Liu, Hui Shao, Yu-Cheng Lin +2
We study effects of disorder (randomness) in a 2D square-lattice quantum spin system, the - model with a 6-spin interaction supplementing the Heisenberg exchange…
Metamagnetism and zero-scale-factor universality in the two-dimensional - model
Adam Iaizzi, Kedar Damle, Anders W. Sandvik
Using a combination of quantum Monte Carlo and exact methods, we study the field-driven saturation transition of the two-dimensional - model, in which the antiferromagnetic H…
Anomalous quantum-critical scaling corrections in two-dimensional antiferromagnets
Nvsen Ma, Phillip Weinberg, Hui Shao +3
We study the Néel-paramagnetic quantum phase transition in two-dimensional dimerized Heisenberg antiferromagnets using finite-size scaling of quantum Monte Carlo data. We r…
Numerical Investigations of SO(4) Emergent Extended Symmetry in Spin-1/2 Heisenberg Antiferromagnetic Chains
Pranay Patil, Emanuel Katz, Anders W. Sandvik
The antiferromagnetic Heisenberg chain is expected to have an extended symmetry, [SU(2)xSU(2)]/Z 2 , in the infrared limit, whose physical interpretation is that the spin and dimer…