122 citations · 275 across the 7 of their papers we have counts for
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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…
Dissipation-driven phase transition in 2D Josephson arrays
Luca Capriotti, Alessandro Cuccoli, Andrea Fubini +2
We analyze the interplay of dissipative and quantum effects in the proximity of a quantum phase transition. The prototypical system is a resistively shunted two-dimensional Josephs…
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…
Quantum 2D Heisenberg antiferromagnet: bridging the gap between field-theoretical and semiclassical approaches
Bernard B. Beard, Alessandro Cuccoli, Ruggero Vaia +1
The field-theoretical result for the low- behaviour of the correlation length of the quantum Heisenberg antiferromagnet on the square lattice was recently improved by Hasenfratz…
Path integral Monte Carlo for dissipative many-body systems
Luca Capriotti, Alessandro Cuccoli, Andrea Fubini +2
We address the possibility of performing numerical Monte Carlo simulations for the thermodynamics of quantum dissipative systems. Dissipation is considered within the Caldeira-Legg…
Effective Hamiltonian with holomorphic variables
A. Cuccoli, V. Tognetti, R. Giachetti +2
The pure-quantum self-consistent harmonic approximation (PQSCHA) permits to study a quantum system by means of an effective classical Hamiltonian. In this work the PQSCHA is reform…