Concept

Density

Related publications (306)

Two-dimensional electron gas at noble-metal surfaces

The electrons of the surface states on the (I 11) surfaces of the noble metals An, Ag, and Cu form a quasi-two-dimensional (2D) free electron gas which is confined to the first few atomic layers at the crystal surface. They are scattered by the potential a ...

2002

Comparison of radiative properties of InAs quantum dots and GaInNAs quantum wells emitting around 1.3 mu m

Benoît Marie Joseph Deveaud, Marc Ilegems, Ursula Oesterle, Jean-Daniel Ganière

The emission properties of self-assembled InAs quantum dots (QDs) and lattice-matched GaInNAs quantum wells (QWs) emitting around 1.3 mum were investigated by temperature-dependent and time-resolved photoluminescence (PL). The QDs have much higher PL effic ...

2002

Hydrogen related bonding structure in hydrogenated polymorphous and microcrystalline silicon

Raphaël Butté

We investigate the hydrogen related bonding structure in hydrogenated polymorphous silicon films (pm-Si:H) and hydrogenated microcrystalline silicon. Infra-red spectra reveal some new features for both kinds of films. namely new modes appearing in the stre ...

2002

The microstructure and tensile properties of pure Ni single crystal irradiated with high energy protons

Zhongwen Yao

The microstructure and tensile behavior of pure single crystalline Ni irradiated with 590 MeV protons are investigated. First results have been obtained for a damage level of 0.13 dpa at room temperature and 0.002 dpa at 523 K. The irradiation induced defe ...

2002

sp(2)/sp(3) hybridization ratio in amorphous carbon from C 1s core-level shifts: X-ray photoelectron spectroscopy and first-principles calculation

Alfredo Pasquarello

Using a combined experimental and theoretical approach, we address C 1s core-level shifts in amorphous carbon. Experimental results are obtained by x-ray photoelectron spectroscopy (XPS) and electron-energy-loss spectroscopy (EELS) on thin-film samples of ...

2002

Hot phonons and Auger related carrier heating in semiconductor optical amplifiers

Benoît Marie Joseph Deveaud, Marc-André Dupertuis, Daniel Marti, Lars Kappei

We have directly measured the carrier temperature in semiconductor optical amplifiers (SOAs) via spontaneous emission and we demonstrate an unexpectedly high carrier temperature. The direct correlation of the temperature increase with the carrier density s ...

2002

The impact of irradiation temperature on the microstructure of F82H martensitic/ferritic steel irradiated in a proton and neutron mixed spectrum

Yong Dai

F82H low-activation martensitic steel was irradiated in the Swiss Spallation Neutron Source (SINQ) Target-III to irradiation doses of 10-12 dpa in a temperature range of 140-360 degreesC. Transmission electron microscope observations have been performed to ...

2002

High field side measurements of non-thermal electron cyclotron emission on TCV plasmas with ECH and ECCD

Stefano Coda, Stefano Alberti, Patrick Blanchard, Henri Weisen, Igor Klimanov, Petri Nikkola

Measurements of electron cyclotron emission (ECE) from the high field side of the TCV tokamak have been made on plasmas heated by second and third harmonic X-mode electron cyclotron heating (ECH) and electron cyclotron current drive (ECCD). Suprathermal EC ...

2002

Influence of Nd : YAG parameters on the selective laser sintering of metallic powders

Rémy Glardon, Valerio Romano

Compared with CW CO2 laser sources, Nd:YAG lasers with Q-switching capability offer a wider parameter range, with improved sintering control, due to the short pulsed energy delivery. In particular, thermal diffusion being strictly limited by the nanosecond ...

2001

Synthesis and characterization of an Al(69)(3-) cluster with 51 naked Al atoms: analogies and differences to the previously characterized Al(77)(2-) cluster

A disproportionation process of a metastable AlCl solution with a simultaneous ligand exchange-Cl is substituted by N(SiMe(3))(2)-leads to a [Al(69)N(SiMe(3))(2)](3-) cluster compound that can be regarded as an intermediate on the way to bulk metal f ...

2001

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