Concept

Susceptibilité électrique

Publications associées (136)

Theory of atomic-scale dielectric permittivity at insulator interfaces

We develop a theory for investigating atomic-scale dielectric permittivity profiles across interfaces between insulators. A local susceptibility chi(x;omega) is introduced to describe variations of the dielectric response over length scales of the order of ...

2005

Effect of spontaneous polarization screening on dielectric response of ferroelectric polydomain films

Nava Setter, Alexander Tagantsev, Pavel Mokry

A theoretical study on the effect of spontaneous polarization screening on the dielectric response of ferroelectric films with 180 degrees domains going through the film thickness (through-domains) is presented. It has been shown by several researchers tha ...

2005

Infrared properties of the Si-SiO2 interface from first principles

Feliciano Giustino

We study the infrared properties of the Si-SiO2 interface within a first-principles approach. In order to provide an atomic-scale description of the dielectric permittivity (both high-frequency and static) and of the infrared absorption at the interface, w ...

EPFL2005

Equivalent oxide thickness of a thin oxide interlayer in gate insulator stacks on silicon

Alfredo Pasquarello, Angelo Bongiorno

We investigate the equivalent oxide thickness of a thin oxide interlayer in gate insulator stacks on silicon. Through the use of a first-principles approach, we map the profile of the local permittivity across two interface models showing different suboxid ...

2005

UV-induced index changes in undoped fluoride glass

Theo Lasser, Hans Georg Limberger, Marcel Zeller

Undoped fluoride glass slides have been exposed to pulsed 193-nm ultraviolet (UV) irradiation. Their absorption changes have been measured to evaluate UV-induced index changes using Kramers-Kronig relation. A layer-peeling polishing technique was applied t ...

2005

Dielectric susceptibility of dipolar molecular liquids by ab initio molecular dynamics: application to liquid HCl

Alfredo Pasquarello

We study the dielectric susceptibility of liquid hydrogen chloride at a temperature of 313 K using ab initio molecular dynamics evolving, in a homogeneous electric field. For an evolution in absence of electric field, the calculated neutron structure facto ...

2004

First-principles investigation of high-kappa dielectrics: Comparison between the silicates and oxides of hafnium and zirconium

Alfredo Pasquarello

Using density-functional theory, we investigate the structural, vibrational, and dielectric properties of Hf and Zr oxides and silicates which have drawn considerable attention as alternative high-kappa materials. For the silicates, we consider hafnon HfSi ...

2004

Density-functional perturbational theory for dielectric tensors in the ultrasoft pseudopotential scheme

Alfredo Pasquarello

We introduce a density-functional perturbational scheme based on ultrasoft pseudopotentials for calculating dielectric tensors of periodic systems. We obtain a variational functional for the second-order derivative of the energy with respect to an electric ...

2004

Analysis of the non linear domain wall response in ferroelectric thin films

Nava Setter, Dragan Damjanovic

In ferroelectric materials, domain wall displacement plays a key role in the dielectric properties measured with respect to the driving field amplitude and frequency. The low to medium field dielectric response in many ferroic systems can be often describe ...

2004

Pb(Mg1/3Nb2/3)O-3 and (1-x)Pb(Mg1/3Nb2/3)O-3-xPbTiO(3) relaxor ferroelectric thick films: Processing and electrical characterization

Nava Setter, Dragan Damjanovic

The lead magnesium niobate [Pb(Mg1/3Nb2/3)O-3 or PMN], and its solid solutions with lead titanate (PbTiO3 or PT), are of great interest because of their high electromechanical properties. At large PMN content, these materials exhibit relaxor characteristic ...

2004

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