129 citations · 775 across the 16 of their papers we have counts for
7 papers · 1 filter
Staggered magnetization and entanglement enhancement by magnetic impurities in spin chain
Tony Apollaro, Alessandro Cuccoli, Andrea Fubini +2
We study the effects of a magnetic impurity on the behavior of a spin chain. At T=0, both with and without an applied uniform magnetic field, an oscillating magnetization a…
Extracting signatures of quantum criticality in the finite-temperature behavior of many-body systems
Alessandro Cuccoli, Alessio Taiti, Ruggero Vaia +1
We face the problem of detecting and featuring footprints of quantum criticality in the finite-temperature behavior of quantum many-body systems. Our strategy is that of comparing…
Quantum phase transition in spin systems studied through entanglement estimators
Andrea Fubini, Stephan Haas, Tommaso Roscilde +2
Entanglement represents a pure quantum effect involving two or more particles. Spin systems are good candidates for studying this effect and its relation with other collective phen…
Divergence of the entanglement range in low dimensional quantum systems
L. Amico, F. Baroni, A. Fubini +3
We study the pairwise entanglement close to separable ground states of a class of one dimensional quantum spin models. At T=0 we find that such ground states separate regions, in t…
Reading entanglement in terms of spin configurations in quantum magnets
Andrea Fubini, Tommaso Roscilde, Valerio Tognetti +2
We consider a quantum many-body system made of interacting spins on a lattice, and develop a formalism which allows to extract, out of conventional magnetic observabl…
Detection of XY behaviour in weakly anisotropic quantum antiferromagnets on the square lattice
Alessandro Cuccoli, Tommaso Roscilde, Ruggero Vaia +1
We consider the Heisenberg antiferromagnet on the square lattice with S=1/2 and very weak easy-plane exchange anisotropy; by means of the quantum Monte Carlo method, based on the c…