Single-valley high-mobility (110) AlAs quantum wells with anisotropic mass

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Quaternion and Biquaternion Representations of Proper and Improper Transformations in Non-Cartesian Reference Systems

Quy Hien Le

Quaternion and biquaternion symmetry transformations have been applied to non-Cartesian reference systems of direct and reciprocal crystal lattices. The transformations performed directly in the sets of crystal reference axes simplify the calculations, eli ...

MDPI2024

Dieter Schwarzenbach (1936-2024)

Gervais Chapuis

Dieter passed away at the hospital in Lausanne, Switzerland, after a long neurodegenerative decline. He leaves behind his wife, Vera, and his two children, Charlotte and Thomas. I met Dieter in 1966 when I started my doctoral studies at the Institute of Cr ...

International Union of Crystallography (IUCr)2024

Exciton localization mechanisms in wurtzite/zinc-blende GaAs nanowires

Anna Fontcuberta i Morral, Martin Heiss, Sonia Conesa Boj, Emanuele Uccelli

We investigate the emission properties of excitons in GaAs nanowires containing quantum disks formed by structural alternation between the zinc-blende and wurtzite phases, by means of temperature-dependent photoluminescence. At 10 K the emission from an en ...

American Physical Society (APS)2013

Gravitational lenses : time delays and the Hubble constant

Christel Vuissoz

The Hubble constant H0 is one of the most important parameters in cosmology, as it encodes the age of the Universe and is necessary for any distance determination at a cosmological scale. It is, however, only poorly constrained by traditional methods. The ...

EPFL2008