10.1k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Sapienza University of RomeIT156 papers
- Scuola Internazionale Superiore di Studi AvanzatiIT146 papers
- University of InsubriaIT88 papers
- University of MilanIT85 papers
- University of TrentoIT85 papers
- Politecnico di TorinoIT78 papers
- University of FlorenceIT74 papers
- University of GenoaIT69 papers
- Centre National de la Recherche ScientifiqueFR65 papers
- The Abdus Salam International Centre for Theoretical Physics (ICTP)IT65 papers
- National Research CouncilLK58 papers
- University of SalernoIT56 papers
61 papers · 1 filter
Critical behaviour of the three-dimensional gonihedric Ising Model
E. N. M. Cirillo, G. Gonnella, A. Pelizzola
We use the cluster variation method (CVM) and Monte Carlo simulations to investigate the phase structure of the 3d gonihedric Ising actions defined by Savvidy and Wegner. This mode…
Steric constraints in model proteins
Cristian Micheletti, Jayanth R. Banavar, Amos Maritan +1
A simple lattice model for proteins that allows for distinct sizes of the amino acids is presented. The model is found to lead to a significant number of conformations that are the…
Macroscopic polarization and band offsets at nitride heterojunctions
Fabio Bernardini, Vincenzo Fiorentini
Ab initio electronic structure studies of prototypical polar interfaces of wurtzite III-V nitrides show that large uniform electric fields exist in epitaxial nitride overlayers, du…
Quantum-Classical Correspondence in Energy Space: Two Interacting Spin-Particles
Fausto Borgonovi, Italo Guarneri, Felix Izrailev
The Hamiltonian conservative system of two interacting particles has been considered both in classical and quantum description. The quantum model has been realized using a symmetri…
3-Body Scattering (3BS) theory of on-site correlation in narrow band materials
Franca Manghi, Massimo Rontani
We present the results of a recently developed approach where the interplay between the itinerant and localized character of electrons in narrow band materials is described by addi…
N-representability and density-functional construction in curvilinear coordinates
L. De Santis, R. Resta
In practical implementations of density-functional theory, the only term where an orbital description is needed is the kinetic one. Even this term in principle depends on the densi…
The Role of dimensionality in the stability of a confined Bose gas
Luca Salasnich
We study analytically the ground-state stability of a Bose-Einstein condensate (BEC) confined in an harmonic trap with repulsive or attractive zero-range interaction by minimizing…
DMRG study of the spin gap in a one dimensional Hubbard model: effect of the distant transfer and exchange coupling
Ryotaro Arita, Kazuhiko Kuroki, Hideo Aoki +1
The spin gap of a one-dimensional repulsive Hubbard model is numerically calculated with the density matrix renormalization group, with a special emphasis on the effect of a next-n…
Energy constrained sandpile models
Alessandro Chessa, Enzo Marinari, Alessandro Vespignani
We study two driven dynamical systems with conserved energy. The two automata contain the basic dynamical rules of the Bak, Tang and Wiesenfeld sandpile model. In addition a global…
Structural and Electronic Properties of a Wide-gap Semiconductor Alloy: Zn_xMg_{1-x}S_ySe_{1-y}
Antonino Marco Saitta, Stefano de Gironcoli, Stefano Baroni
The structural properties of the solid solutions are determined by a combination of the computational alchemy and the cluster expansion methods with Monte…
Effective Potential, Mori Product and Quantum Dynamics
A. Cuccoli, R. Giachetti, V. Tognetti +1
We present a method that permits the calculation of the dynamical correlation functions for quantum systems. These are obtained by evaluating the generating functionals of the stat…
Addition energies in semiconductor quantum dots: Role of electron-electron interaction
Massimo Rontani, Fausto Rossi, Franca Manghi +1
We show that the addition spectra of semiconductor quantum dots in the presence of magnetic field can be studied through a theoretical scheme that allows an accurate and practical…
Bloch oscillations and Wannier-Stark localization in semiconductor superlattices
Fausto Rossi
The theoretical analysis of the ultrafast energy relaxation and transport phenomena in semiconductor superlattices is reviewed. In particular, we discuss the two equivalent quantum…
Coherent phenomena in semiconductors
Fausto Rossi
A review of coherent phenomena in photoexcited semiconductors is presented. In particular, two classes of phenomena are considered: On the one hand the role played by optically-ind…
Phase-transitions induced by easy-plane anisotropy in the classical Heisenberg antiferromagnet on a triangular lattice: a Monte Carlo simulation
Luca Capriotti, Ruggero Vaia, Alessandro Cuccoli +1
We present the results of Monte Carlo simulations for the antiferromagnetic classical XXZ model with easy-plane exchange anisotropy on the triangular lattice, which causes frustrat…
Anomalous fluctuations of the condensate in interacting Bose gases
S. Giorgini, L. P. Pitaevskii, S. Stringari
We find that the fluctuations of the condensate in a weakly interacting Bose gas confined in a box of volume follow the law . This anomalous behaviour ari…
Chaos and Thermalization in a Dynamical Model of Two Interacting Particles
F. Borgonovi, I. Guarneri, F. M. Izrailev +1
A quantum dynamical model of two interacting spins, with chaotic and regular components, is investigated using a finite two-particles symmetrized basis. Chaotic eigenstates give ri…
Cutting-Decimation Renormalization for diffusive and vibrational dynamics on fractals
Raffaella Burioni, Davide Cassi, Sofia Regina
Recently, we pointed out that on a class on non exactly decimable fractals two different parameters are required to describe diffusive and vibrational dynamics. This phenomenon we…
Quantum State Reconstruction of a Bose-Einstein Condensate
Stefano Mancini, Paolo Tombesi
We propose a tomographic scheme to reconstruct the quantum state of a Bose-Einstein condensate, exploiting the radiation field as a probe and considering the atomic internal degree…
Diffusion on non exactly decimable tree-like fractals
Raffaella Burioni, Davide Cassi, Alberto Pirati +1
We calculate the spectral dimension of a wide class of tree-like fractals by solving the random walk problem through a new analytical technique, based on invariance under generaliz…
Realistic grand canonical Monte Carlo surface simulation: application to Ar(111)
Franck Celestini, Daniele Passerone, Furio Ercolessi +1
Most realistic, off-lattice surface simulations are done canonically--- conserving particles. For some applications, however, such as studying the thermal behavior of rare gas soli…
Damping in dilute Bose gases: a mean-field approach
S. Giorgini
Damping in a dilute Bose gas is investigated using a mean-field approximation which describes the coupled oscillations of condensate and non-condensate atoms in the collisionless r…
Interference effects in f-deformed fields
Stefano Mancini, Paolo Tombesi, Vladimir I. Man'ko
We show how the introduction of an algeabric field deformation affects the interference phenomena. We also give a physical interpretation of the developed theory.
On the Convergence of the WKB Series for the Angular Momentum Operator
Luca Salasnich, Fabio Sattin
In this paper we prove a recent conjecture [Robnik M and Salasnich L 1997 J. Phys. A: Math. Gen. 30 1719] about the convergence of the WKB series for the angular momentum operator.…