PhD and Post doc positions at LIDYL, Saclay, France

Petahertz optoelectronics in 2D and 3D solids

A post-doc and a PhD position in petahertz opto-electronics in the framework of the PETACom
European project ( are available. Optoelectronic is extending to the highly non-linear
regime. A recent impact of this capability of controlling the response of above band gap electrons under
strong fields is the emergence of high harmonic generation (HHG) in crystal 1-6 . 2D and 3D semiconductors
exhibits properties of high electron mobility that allows to drive intense electrons currents coherently in the
conduction band. HHG are emitted when those electrons recombine to the valence band. This is a pure above
band gap non-perturbative phenomena which occurs efficiently in a few 10s to 100s nanometer exit layer of
a crystal and down to an atomically thin layer 5,6 . The strong electron current from which HHG originate can
be manipulated in space and time. The project will focus in the strong localization in space, and time, at the
single optical cycle scale 7,8 , of the harmonic generation process. This control can not only revolutionize
attosecond science but also prepare a new generation of ultrafast visible to X-ray opto-electronic devices.
Based on the CEA group expertise, experimental and theoretical resources 9-12 , the fellow will seek for
efficient ways to control on attosecond time scale the harmonic emission. CEP studies of the harmonic
emission correlated to the petahertz electron current will be performed. A specific focus will be on
correlated materials. The candidate will develop scheme for the generation of isolated attosecond pulses
using intrinsic and extrinsic HHG control on such materials.

The research will use state of the art mid-infrared femtosecond systems: a 100kHz few optical cycles mid-
infrared intense OPCPA (tunable from 1,5 to 3.4 µm wavelength) and a 2µm intense MHz rep/rate few optical
cycles fiber laser.

The candidate should have solid skills in strong-field physics (HHG, ATI), ultrafast condensed matter,
XUV, IR to MIR ultrafast laser science. We require autonomy and leadership (please provide at least 2 letters
of recommendation). The candidate will work in a group that has a solid expertise in ultrafast X-ray science.
You will interact daily with two senior scientists, 3 post-docs and 3 PhD students that are part of the project.
Salary is in a range between 2400-2900 euros net/month for a post-doc and 1400-1600 net/month for a PhD
depending on the fellow expertise/ experience.

CEA-Saclay (20 km south of Paris). LIDYL Laboratory
Starting date : 2019/2020
Contact person : Hamed Merdji
e-mail :