Jobs

Promotors: STEM Group at the LPS, Orsay, France and Attolight, Lausanne, Switzerland

Location: LPS, Orsay, France

Duration: 2 years

Opening: Now

 Contacts: Luiz Tizei and Mathieu Kociak

The STEM group is active in the development of new electron spectroscopy techniques in electron microscopes. In particular, it explores the use of electron spectroscopy for nanooptics.

Attolight is a Swiss company developing quantitative cathodoluminescence.

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Cathodoluminescence Light Excitation spectroscopy

Promotors: STEM Group at the LPS, Orsay, France and Attolight, Lausanne, Switzerland

Location: LPS, Orsay, France

Duration: 2 years

Opening: Now Read more »

Context

Atomic defects play a key role in defining the ultimate optical properties of semi­conducting materials but the precise correlation of their structure and chemistry with spe­cific spectral features remains a challenging task. Recent developments in aberration corrected scanning transmission electron microscopes (STEM) have provided new tools to tackle this problem allowing to achieve the sub-Angstrom space resolution both in imaging and spec­troscopy. Still, spectro-microscopy of defects in standard 3D semi­conductors is strongly hin­dered by deep embedding into the bulk matrix. On the contrary, bi-di­mensional layered semi-conductors represent opti­mal model systems since they associate re­markable optical properties to a reduced di­mensionality which allows to address individual atoms. Among this class of materials, hexagonal boron nitride (h-BN) presents a unique com­bination of a layered wide indi­rect band gap and a strong luminescence in the far UV due to excitons strongly cou­pled with phonon modes. Read more »