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
24 papers · 2 filters
Derivatives of the fixed-node energy
S. De Palo, S. Moroni, S. Baroni
We present quantum Monte Carlo calculations of total energy derivatives, consistently performed in the fixed-node approximation. Contributions from nodal displacements, neglected o…
Superfluidity vs Bose-Einstein condensation in a Bose gas with disorder
G. E. Astrakharchik, J. Boronat, J. Casulleras +1
We investigate the phenomenon of Bose-Einstein condensation and superfluidity in a Bose gas at zero temperature with disorder. By using the Diffusion Monte-Carlo method we calculat…
Excitonic effects in solids described by time-dependent density functional theory
Lucia Reining, Valerio Olevano, Angel Rubio +1
Starting from the many-body Bethe-Salpeter equation we derive an exchange-correlation kernel that reproduces excitonic effects in bulk materials within time-dependent dens…
Spin-based optical quantum gates via Pauli blocking in semiconductor quantum dots
E. Pazy, E. Biolatti, T. Calarco +4
We present a solid-state implementation of ultrafast conditional quantum gates. Our proposal for a quantum-computing device is based on the spin degrees of freedom of electrons con…
On the Nature of Charge Transport in Quantum-Cascade Lasers
Rita Claudia Iotti, Fausto Rossi
The first global quantum simulation of semiconductor-based quantum-cascade lasers is presented. Our three-dimensional approach allows to study in a purely microscopic way the curre…
Electro-optical properties of semiconductor quantum dots: Application to quantum information processing
Eliana Biolatti, Irene D'Amico, Paolo Zanardi +1
A detailed analysis of the electro-optical response of single as well as coupled semiconductor quantum dots is presented. This is based on a realistic ---i.e., fully tridimensional…
Quasi 2D Bose-Einstein condensation in an optical lattice
S. Burger, F. S. Cataliotti, C. Fort +3
We study the phase transition of a gas of Rb atoms to quantum degeneracy in the combined potential of a harmonically confining magnetic trap and the periodic potential of an optica…
Finite size effects on the collective oscillations of a trapped Bose gas
Francesca Zambelli, Sandro Stringari
Sum rules are used to calculate the corrections to the hydrodynamic collective frequencies of a harmonically trapped Bose gas at T=0, due to finite size effects. We show that, with…
Environment induced localization and superselection rules in a gas of pyramidal molecules
Giovanni Jona-Lasinio, Carlo Presilla, Cristina Toninelli
We propose a model to describe a gas of pyramidal molecules interacting via dipole-dipole interactions. A cooperative effect induced by the interaction modifies the tunneling prope…
Helium nanodroplets and trapped Bose-Einstein condensates as prototypes of finite quantum fluids
F. Dalfovo, S. Stringari
Helium nanodroplets and trapped Bose-Einstein condensates in dilute atomic gases offer complementary views of fundamental aspects of quantum many-body systems. We discuss analogies…
Interaction induced localization in a gas of pyramidal molecules
Giovanni Jona-Lasinio, Carlo Presilla, Cristina Toninelli
We propose a model to describe a gas of pyramidal molecules interacting via dipole-dipole interactions. The interaction modifies the tunneling properties between the classical equi…
Vortex nucleation and quadrupole deformation of a rotating Bose-Einstein condensate
M. Kraemer, L. Pitaevskii, S. Stringari +1
Using a semi-analytic model based on the Thomas-Fermi approximation, we investigate the relevance of the quadrupole deformation of a trapped Bose-Einstein condensate for the nuclea…
Hydrodynamic Excitations in a Spin-Polarized Fermi Gas under Harmonic Confinement in One Dimension
A. Minguzzi, P. Vignolo, M. L. Chiofalo +1
We consider a time-dependent non-linear Schrödinger equation in one dimension (1D) with a fifth-order interaction term and external harmonic confinement, as a model for both (i) a…
Thermal vs quantum decoherence in double well trapped Bose-Einstein condensates
L. Pitaevskii, S. Stringari
The quantum and thermal fluctuations of the phase are investigated in a cold Bose gas confined by a double well trap. The coherence of the system is discussed in terms of the visib…
Quantum Fractal Fluctuations
Giuliano Benenti, Giulio Casati, Italo Guarneri +1
We numerically analyse quantum survival probability fluctuations in an open, classically chaotic system. In a quasi-classical regime, and in the presence of classical mixed phase s…
Topological Reduction of Tight-Binding Models on Complex Networks
P. Buonsante, R. Burioni, D. Cassi
Complex molecules and mesoscopic structures are naturally described by general networks of elementary building blocks and tight-binding is one of the simplest quantum model suitabl…
Storage Qubits and Their Potential Implementation Through a Semiconductor Double Quantum Dot
E. Pazy, I. D'Amico, P. Zanardi +1
In the context of a semiconductor based implementation of a quantum computer the idea of a quantum storage bit is presented and a possible implementation using a double quantum dot…
Spin Polarized Ground State for Interacting Electrons in Two Dimensions
Giuliano Benenti, Gaetan Caldara, Dima L. Shepelyansky
We study numerically the ground state magnetization for clusters of interacting electrons in two dimensions in the regime where the single particle wavefunctions are localized by d…
Deep Inelastic Neutron Scattering determination of the single particle kinetic energy in solid and liquid 3He
R. Senesi, C. Andreani, D. Colognesi +2
For the first time, an experimental determination of the single-particle mean kinetic energies for 3He along the T=2.00 K isotherm in the dense liquid and in the solid hcp and bcc…
Two-Stage Rotational Disordering of a Molecular Crystal Surface: C60
C. Laforge, D. Passerone, A. B. Harris +2
We propose a two-stage mechanism for the rotational surface disordering phase transition of a molecular crystal, as realized in C fullerite. Our study, based on Monte Carlo…
Bose-Einstein condensation and superfluidity in trapped atomic gases
Sandro Stringari
Bose-Einstein condensates confined in traps exhibit unique features which have been the object of extensive experimental and theoretical studies in the last few years. In this pape…
Disordered Hubbard Model with Attraction: Coupling Energy of Cooper Pairs in Small Clusters
J. Lages, G. Benenti, D. L. Shepelyansky
We generalize the Cooper problem to the case of many interacting particles in the vicinity of the Fermi level in the presence of disorder. On the basis of this approach we study nu…
A superfluid gyroscope with cold atomic gases
S. Stringari
A trapped Bose-Einstein condensed atomic gas containing a quantized vortex is predicted to exhibit precession after a sudden rotation of the confining potential. The equations desc…
How does the Eurodollar Interest Rate behave?
Tiziana Di Matteo, Tomaso Aste
An empirical analysis on Eurodollar interest rates daily data in the time period 1990-1996, is performed and compared with Libor data in the time period 1984-1998. The complementar…