270 citations · 386 across the 6 of their papers we have counts for
6 papers · 1 filter
Entanglement, combinatorics and finite-size effects in spin-chains
Bernard Nienhuis, Massimo Campostrini, Pasquale Calabrese
We carry out a systematic study of the exact block entanglement in XXZ spin-chain at Delta=-1/2. We present, the first analytic expressions for reduced density matrices of n spins…
Evidence for a floating phase of the transverse ANNNI model at high frustration
Matteo Beccaria, Massimo Campostrini, Alessandra Feo
We study the transverse quantum ANNNI model in the region of high frustration (k>0.5) using the DMRG algorithm. We obtain a precise determination of the phase diagram, showing clea…
22nd order high-temperature expansion of nearest-neighbor models with O(2) symmetry on a simple cubic lattice
Massimo Campostrini, Martin Hasenbusch, Andrea Pelissetto +1
We present the high-temperature series for a nearest-neighbor model with O(2) symmetry on a simple cubic lattice with the most general single-site potential. In particular, the mag…
The critical exponents of the superfluid transition in He4
Massimo Campostrini, Martin Hasenbusch, Andrea Pelissetto +1
We improve the theoretical estimates of the critical exponents for the three-dimensional XY universality class, which apply to the superfluid transition in He4 along the lambda-lin…
Critical behavior in a non-local interface model
Matteo Beccaria, Massimo Campostrini, Alessandra Feo
The Raise and Peel model is a recently proposed one-dimensional statistical model describing a fluctuating interface. The evolution of the model follows from the competition betwee…
On the evaluation of the improvement parameter in the lattice Hamiltonian approach to critical phenomena
Massimo Campostrini, Pietro Parruccini, Paolo Rossi
In lattice Hamiltonian systems with a quartic coupling , a critical value may exist such that, when , the leading irrelevant operator decouples from the Hamiltonian…