Rare regions, ie, rare large spatial disorder fluctuations, can dramatically change the
properties of a phase transition in a quenched disordered system. In generic classical …

There is a large variety of quantum and classical systems in which the quenched disorder
plays a dominant rôle over quantum, thermal, or stochastic fluctuations: these systems …

We analyze the effect of quenched disorder on spin-1/2 quantum magnets in which
magnetic frustration promotes the formation of local singlets. Our results include a theory for …

We introduce the concept of directed loops in stochastic series expansion and path-integral
quantum Monte Carlo methods. Using the detailed balance rules for directed loops, we …

A review of the loop algorithm, its generalizations, and its relation to some other Monte Carlo
techniques is given. The loop algorithm is a quantum Monte Carlo procedure that employs …

A quantum Monte Carlo algorithm for the transverse Ising model with arbitrary short-or long-
range interactions is presented. The algorithm is based on sampling the diagonal matrix …

The quantum-critical properties of the transverse-field Ising model with algebraically
decaying interactions are investigated by means of stochastic series expansion quantum …

Sr 2 CuTeO 6 is a square-lattice Néel antiferromagnet with superexchange between first-
neighbor S= 1/2 Cu spins mediated by plaquette centered Te ions. Substituting Te by W, the …

We report quantitative neutron scattering measurements of the evolution with doping of the
Néel temperature, the antiferromagnetic correlations, and the ordered moment of as-grown …

We study the effects of dissipation on a disordered quantum phase transition with O (N)
order-parameter symmetry by applying a strong-disorder renormalization group to the …