Reference : UPR8011-JEAPOU-001
Workplace : TOULOUSE
Date of publication : Monday, May 2, 2022
Scientific Responsible name : Jean-Marie Poumirol
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2022
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
The Ti-P project proposes to study the unique non-reciprocal plasmonic dispersion generated by the topological properties of the electronic band structure of Dirac Materials and of monolayer transition metal dichalcogenide in particular. The project aims at providing an experimental observation of such non-reciprocal surface plasmon polariton propagation through far field infrared optical spectroscopy. It rest on the presence at CEMES of a broadband Fourier transform spectrometer allowing micro-FTIR measurements on micrometer size samples and a solid scientific collaboration through which large BN encapsulated TMDs will be provided. We propose an original approach based on the design of specific plasmonic crystals supporting non-reciprocal plasmonic, the control of the topological properties through valley asymmetric carrier population using circularly polarized optical pumping (visible light) and polarization dependent IR spectroscopy to detect modifications of the light polarization state interacting with the plasmons. Through the observation of these modes, we aim at providing a better understanding of the impact of quantum topology on the collective excitations of charged carriers and to make the first steps toward the development of a tunable valley-optic light technology that will offer new ways for information control.
The PhD will take place in CEMES a CNRS Laboratory, mainly focused on nano-science. This work will require a good knowledge in condensed matter physics, experimental skills and knowledge in programmation (Python). The main tasks to be carried out during this Phd will be: (i) samples fabrication: Manipulation of 2D layers (exfoliation, encapsulation) and structuration in clean room. (ii) Development of an innovating experimental set-up specific to the measurement of Infrared plasmons. (iii) Measure of the optical properties of the fabricated samples.
Constraints and risks
laser security and chemical
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