Sommaire:

The most impressive aspect of 2D materials is not the fact that they include vast variety of electronic and optical properties (metals, large band gap semiconductors, superconductors, ferromagnetic, ...). Their specificity is that they can be combined or stacked on top of other materials, quantum light sources or photonic elements, they can even be twisted in plane from another 2D materials. In my talk I will present some illustrations of that unique degree of freedom within the context of material science, optomechanics and quantum nano-photonics.
In particular I will present a graphene NEMS suspended a few tens of nanometers above nitrogen-vacancy centres (NVCs), which are stable single-photon emitters embedded in nanodiamonds [1]. The optomechanical coupling between the graphene displacement and the NVC emission is based on near-field dipole–dipole interaction, making it suitable for nanoscale devices. Semiconducting NEMS (WSe2, MoSe2) also show high mechanical Q-factors, which can be used to study the thermal properties of such materials[4]. Then, I will show a slightly different hybrid system consisting in lifetime-limited single emitters [2,3] (linewidth ~40 MHz) and 2D materials at sub-wavelength separation without degradation of the emission properties [4]. Our device’s nanoscale dimensions enable ultra-broadband tuning (tuning range > 400 GHz) and fast modulation (frequency ~ 100 MHz) of the emission energy, which renders it an integrated, ultra-compact tuneable SPS [5]. Conversely, this offers a novel approach to optical sensing of 2D material properties using a single emitter as a nanoprobe.

References
[1] Reserbat-Plantey A., Schädler K., Gaudreau L., Navickaite G., Güttinger J., Chang D.,Toninelli C., Bachtold A., and Koppens F. Electromechanical control of nitrogen- vacancy defect emission using graphene NEMS. Nature Communication. 7, 10218. 2016
[2] N. Morell, S. Tepsic, A. Reserbat-Plantey, A. Cepellotti, M. Manca, I. Epstein, A. Isacsson, X. Marie, F. Mauri, and Adrian Bachtold. Optomechanical Measurement of Thermal Transport in Two-Dimensional MoSe2 Lattices. Nano Letters. 19-5, 3141. 2019
[3] Morell*, N., Reserbat-Plantey*, A., Tsioutsios, I., Schädler, K., Dubin, F., Koppens, F., Bachtold, A. High Quality Factor Mechanical Resonators Based on WSe2 Monolayers.
Nano Letters. 16, 5102–5108. 2016
[4] K. Schädler,C. Ciancico, S.Pazzagli, P. Lombardi, A. Bachtold, C. Toninelli, A. Reserbat- Plantey, and F. Koppens. Electrical Control of Lifetime-Limited Quantum Emitters Using 2D Materials. Nano Letters. 19-6. 3789. 2019
[5] C. Ciancico, K. Schädler, S. Pazzagli, M. Colautti, P. Lombardi, J. Osmond, C. Dore, A. Mihi, A. Ovvyan, W. Pernice, E. Berretti, A. Lavacchi, C. Toninelli, F. Koppens and A. Reserbat- Plantey. Narrow Line Width Quantum Emitters in an Electron-Beam-Shaped Polymer. ACS Photonics, 6, 12, 3120. 2019

Pour plus d'informations, merci de contacter Cassabois G.