CE30 - Physique de la matière condensée et de la matière diluée

Topologically induced non-reciprocal surface plasmons – Ti-P

Submission summary

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 Berry curvature is a topological property of the electronic bands of Dirac Materials. It gives rise to an anomalous transverse velocity affecting the moving carriers and is responsible of charge accumulation along the edges of the system. This transverse velocity has resulted in the first ever observation of valley Hall effect in optically pumped monolayer transition metal dichalcogenides. Ti-P rests on the research hypothesis that this observed DC phenomenon (observed in transport) will present an AC manifestation (observable in optics): non-reciprocal plasmonic modes that will display a dispersion different for the positive and negative value of plasmon momentum (non-reciprocal dispersion). The project aims at providing an experimental observation of such non-reciprocal surface plasmon polariton propagation through far field infrared optical spectroscopy. Ti-P 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. Ti-P 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.

Project coordination


The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.



Help of the ANR 243,040 euros
Beginning and duration of the scientific project: December 2021 - 48 Months

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