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
132 papers · 1 filter
Switching from pyroelectric to ferroelectric order in Ni doped CaBaCo4O7
C. Dhanasekhar, A. K Das, Ripandeep Singh +4
We report ferroelectric ordering in Ni substituted CaBaCo4O7. Magnetization showed ferrimagnetic transition at 60 K and an additional transition is found ~ 82 K, further, enhanced…
Experimental evidence of above-threshold photoemission in solids
Francesco Banfi, Claudio Giannetti, Gabriele Ferrini +4
Nonlinear photoemission from a silver single crystal is investigated by femtosecond laser pulses in a perturbative regime. A clear observation of above-threshold photoemission in s…
Evidence of vectorial photoelectric effect on Copper
Emanuele Pedersoli, Francesco Banfi, Barbara Ressel +7
Quantum Efficiency (QE) measurements of single photon photoemission from a Cu(111) single crystal and a Cu polycrystal photocathodes, irradiated by 150 fs-6.28 eV laser pulses, are…
Exchange bias driven by the Dzyaloshinskii-Moriya interaction and ferroelectric polarization at G-type antiferromagnetic perovskite interfaces
Shuai Dong, Kunihiko Yamauchi, Seiji Yunoki +6
Exchange bias is usually rationalized invoking spin pinning effects caused by uncompensated antiferromagnetic interfaces. However, for compensated antiferromagnets other extrinsic…
First-principles study of the dipole layer formation at metal-organic interfaces
Paul C. Rusu, Gianluca Giovannetti, Christ Weijtens +2
We study the dipole layer formed at metal-organic interfaces by means of first-principles calculations. Interface dipoles are monitored by calculating the work function change of A…
Magnetic anisotropy in Li-phosphates and origin of magnetoelectricity in LiNiPO4
Kunihiko Yamauchi, Silvia Picozzi
Li-based phosphates are paradigmatic materials for magnetoelectricity. By means of first-principles calculations, we elucidate the microscopic origin of spin anisotropy and of magn…
Evidence for multiferroicity in TTF-CA organic molecular crystals
Gianluca Giovannetti, Sanjeev Kumar, Alessandro Stroppa +2
We show by means of ab-initio calculations that the organic molecular crystal TTF-CA is multiferroic: it has an instability to develop spontaneously both ferroelectric and magnetic…
Ferroelectricity in multiferroic magnetite Fe3O4 driven by noncentrosymmetric Fe2+/Fe3+ charge-ordering: First-principles study
Kunihiko Yamauchi, Tetsuya Fukushima, Silvia Picozzi
By means of first-principles simulations, we unambiguously show that improper ferroelectricity in magnetite in the low-temperature insulating phase is driven by charge-ordering. An…
First Principles Studies of Multiferroic Materials
Silvia Picozzi, Claude Ederer
Multiferroics, materials where spontaneous long-range magnetic and dipolar orders coexist, represent an attractive class of compounds, which combine rich and fascinating fundamenta…
Magnetically induced electronic ferroelectricity in half-doped manganites
Gianluca Giovannetti, Sanjeev Kumar, Jeroen van den Brink +1
Using a joint approach of density functional theory and model calculations, we demonstrate that a prototypical charge ordered half-doped manganite, LaCaMnO is m…
Field emission from single multi-wall carbon nanotubes
M. Passacantando, F. Bussolotti, S. Santucci +4
Electron field emission characteristics of individual multiwalled carbon nanotubes have been investigated by a piezoelectric nanomanipulation system operating inside a scanning ele…
Magneto-optical properties of (Ga,Mn)As: an ab--initio determination
A. Stroppa, S. Picozzi, A. Continenza +2
The magneto-optical properties of (Ga,Mn)As have been determined within density functional theory using the highly precise full-potential linear augmented plane wave (FLAPW) method…
Interface effects at a half-metal/ferroelectric junction
Kunihiko Yamauchi, Biplab Sanyal, Silvia Picozzi
Magnetoelectric effects are investigated ab-initio at the interface between half-metallic and ferroelectric prototypes: Heusler CoMnSi and perovskite BaTiO. For the Co-term…
Optical and magneto-optical properties of ferromagnetic full-Heusler films: experiments and first-principles calculations
F. Ricci, S. Picozzi, A. Continenza +5
We report a joint theoretical and experimental study focused on understanding the optical and magneto-optical properties of Co-based full-Heusler compounds. We show that magneto-op…
Dual nature of improper ferroelectricity in a magnetoelectric multiferroic
Silvia Picozzi, Kunihiko Yamauchi, Biplab Sanyal +2
Using first principles calculations, we study the microscopic origin of ferroelectricity (FE) induced by magnetic order in the orthorhombic HoMnO3. We obtain the largest ferroelect…
Role of the electric field in surface electron dynamics above the vacuum level
J. I. Pascual, C. Corriol, G. Ceballos +6
Scanning tunneling spectroscopy (STS) is used to study the dynamics of hot electrons trapped on a Cu(100) surface in field emission resonances (FER) above the vacuum level. Differe…
A local field emission study of partially aligned carbon-nanotubes by AFM probe
A. Di Bartolomeo, A. Scarfato, F. Giubileo +5
We report on the application of Atomic Force Microscopy (AFM) for studying the Field Emission (FE) properties of a dense array of long and vertically quasi-aligned multi-walled car…
Physics of Solid and Liquid Alkali Halide Surfaces Near the Melting Point
T. Zykova-Timan, D. Ceresoli, U. Tartaglino +1
This paper presents a broad theoretical and simulation study of the high temperature behavior of crystalline alkali halide surfaces typified by NaCl(100), of the liquid NaCl surfac…
Electron spin echo relaxation and envelope modulation of phosphorus shallow donors in silicon
A. Ferretti, M. Fanciulli, A. Ponti +1
Spins of single donor atoms are attractive candidates for large scale quantum information processing in silicon, since quantum computation can be realized through the manipulation…
Unusual polymerization in the Li4C60 fulleride
M. Ricco, T. Shiroka, M. Belli +6
Li4C60, one of the best representatives of lithium intercalated fullerides, features a novel type of 2D polymerization. Extensive investigations, including laboratory x-ray and syn…
Quantum-transport theory for semiconductor nanostructures: A density-matrix formulation
Rita Claudia Iotti, Emanuele Ciancio, Fausto Rossi
A general density-matrix formulation of quantum-transport phenomena in semiconductor nanostructures is presented. More specifically, contrary to the conventional single-particle co…
Excitons in boron nitride nanotubes: dimensionality effects
Ludger Wirtz, Andrea Marini, Angel Rubio
We show that the optical absorption spectra of boron nitride (BN) nanotubes are dominated by strongly bound excitons. Our first-principles calculations indicate that the binding en…
Nd:YAG laser induced E' centers probed by in situ absorption measurements
M. Cannas, F. Messina
We investigated various types of commercial silica irradiated with a pulsed Nd:YAG laser radiation (4.66 eV), with exposure time ranging up to 10000 s. Transient E' centers were pr…
Nucleation and step-edge barriers always destabilize step-flow growth of a vicinal surface
Daniele Vilone, Claudio Castellano, Paolo Politi
We consider the effect of nucleation on a one-dimensional stepped surface, finding that step-flow growth is metastable for any strength of the additional step-edge barrier. The sur…