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Publications associées (195)

Intrinsic dynamics of weakly and strongly confined excitons in nonpolar nitride-based heterostructures

Nicolas Grandjean, Benoît Marie Joseph Deveaud, Jacques Levrat, Jean-Daniel Ganière, Pierre Michel Corfdir

Both weakly and strongly confined excitons are studied by time-resolved photoluminescence in a nonpolar nitride-based heterostructure grown by molecular beam epitaxy on the a-facet of a bulk GaN crystal, with an ultralow dislocation density of 2 × 105 cm-2 ...

2011

Scanning Tunneling Microscopy and Luminescence of Individual Nanostructures

Theresa Lutz

A detailed investigation and characterization of the local properties of individual nanoscopic structures is of great importance for the understanding of novel physical phenomena at the nanoscale as well as for the assessment of their possible use in futur ...

EPFL2011

Head-to-head and tail-to-tail 180^{°} domain walls in an isolated ferroelectric

Nava Setter, Alexander Tagantsev, Maxim Gureev

Head-to-head and tail-to-tail 180 degrees domain walls in a finite isolated ferroelectric sample are theoretically studied using Landau theory. The full set of equations, suitable for numerical calculations, is developed. The explicit expressions for the p ...

2011

MICROFABRICATION AND PACKAGING OF A RUBIDIUM VAPOR CELL AS A PLASMA LIGHT SOURCE FOR MEMS ATOMIC CLOCKS

Nico de Rooij, Herbert Shea, Yves Pétremand, Vinu Lalgudi Venkatraman

We report on the micro-fabrication and characterization of a chip-scale plasma light source based on a Rubidium (Rb) vapor cell. The Rb plasma light source is intended for use as an integrated optical pump-light source in miniature double-resonance Rb atom ...

2011

High Thermal Conductivity in Short-Period Superlattices

Nicola Marzari

The thermal conductivity of ideal short-period superlattices is computed using harmonic and anharmonic force constants derived from density-functional perturbation theory and by solving the Boltzmann transport equation in the single-mode relaxation time ap ...

2011

Modulating the Photophysical Properties of Azamacrocyclic Europium Complexes with Charge-Transfer Antenna Chromophores

Two europium complexes with bis(bipyridine) azamacrocyclic ligands featuring pendant arms with or without pi-conjugated donor groups are synthesized and fully characterized by theoretical calculations and NMR spectroscopy. Their photophysical properties, i ...

2011

A novel class of coherent light emitters: polariton lasers

Nicolas Grandjean, Raphaël Butté

The specificities of polariton lasers-a new generation of coherent light-emitting devices where the relaxation of the bosonic quasiparticles responsible for the light emission, the polaritons, is stimulated whereas the photon emission process issued from t ...

2011

Inhibition of the Emission of Electromagnetic Modes of Photonic Crystal Cavities with a Top Mirror

Romuald Houdré, Nicolas Le Thomas

By imaging the angular spectrum of optical modes confined within subwavelength volumes, we investigate the impact of metallic and dielectric surrounding layers on the optical emission properties of planar silicon photonic crystal cavity. By scanning a mirr ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2011

Microcolumn with variable axis lens for large scan fields and pixel numbers

Nico de Rooij, Sebastian Gautsch

A microcolumn is presented containing a variable axis lens optimized for large scan fields and pixel numbers with minimal probe sizes for the deflected beam. At beam energy of 1 keV and a working distance of 38 mm the magnifying column can address scan fie ...

Elsevier2011

Spatial Heterogeneity of Methane Ebullition in a Large Tropical Reservoir

Alfred Johny Wüest, Bernhard Wehrli

Tropical reservoirs have been identified as important methane (CH4) sources to the atmosphere, primarily through turbine and downstream degassing. However, the importance of ebullition (gas bubbling) remains unclear. We hypothesized that ebullition is a di ...

Amer Chemical Soc2011

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