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Reference : UMR8023-YANTOD-018
Workplace : PARIS 05
Date of publication : Saturday, August 01, 2020
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 1 October 2020
Proportion of work : Full time
Remuneration : 2728.28 euros gross monthly for a researcher CDD (seniority less than or equal to 2 years)
Desired level of education : 5-year university degree
Experience required : Indifferent
This post doc project is at the frontier of the mescoscopic physics and the Terahertz optoelectronics.
The aim of the Post-Doc project is to explore quantum infrared detectors operating in the ultra-strong light-matter coupling regime. We will study devices where semiconductor quantum wells are integrated into electromagnetic resonators, “meta-atom”, featuring deep sub-wavelength electromagnetic confinement [1,2]. This geometry allows for ultra-low dark current and improved photo-generation rate . In such devices, we will explore how the presence of light-matter coupled polariton states affects the electronic transport of the device. Furthermore, our electromagnetic resonator behaves as a Terahertz inductor-capacitive circuit, where the capacitive parts can be reduced into nano-metric dimensions. These device architectures allow the realization of the dynamical Coulomb blockade , where the single electron charging energy e²/2C becomes comparable with the meta-atom resonator energy ћ\omega_m. This effect will be exploited as a disruptive approach to sense the quantum-optical properties of light-matter coupled states by all-electronic means. Besides semiconductor layers, we also envision to exploit novel 2D materials such as hexagonal boron nitride and others.
 M. Jeannin, et al. “Ultra-Strong Light-Matter Coupling in Deeply Subwavelength THz LC
resonators”, ACS Photonics 6 (5) 1207-1215 (2019).
 M. Jeannin, et al. “Absorption engineering in an ultra-subwavelength quantum system”, Nano Lett. 20 (6) 4430–4436 (2020).
 D. Palaferri, et al. “Room-temperature nine-µm-wavelength photodetectors and GHz-frequency heterodyne receivers”, Nature 556, pages 85–88 (2018).
 M. H. Devoret, et al. “Effect of the electromagnetic environment on the Coulomb blockade
in ultrasmall tunnel junctions”, Phys. Rev. Lett. 64, 1824 (1990).
-Design of meta-materials compatible with the injection / read-out of electric current in semiconductor devices.
-Clean-room fabrication of semiconductor quantum well-based absorbing regions inserted into metamaterials. Other 2D materials are also envisioned.
- Optical and electrical characterization of devices in cryogenic conditions.
-Theoretical modelling of data in order to understand the links between electronic transport and light-matter coupled states.
- Solid knowledge in condensed matter and/or electronic transport in mesoscopic systems.
-Clean room fabrication: optical and electrical lithography, dry etching (ICP), all process needed for III-V semiconductor devices fabrication.
- Optical and electrical characterization of nanodevices.
This project is supported by the ERC project “UNIQUE” (https://erc.europa.eu/projects-figures/erc-fundedprojects/results?search_api_views_fulltext=todorov). The goal of this project is to explore the quantum effects of the ultra-strong light-matter coupling regime. The project will take place in the QUAD team of the Physics Laboratory of the Ecole Normale Supérieure, located in the Latin Quarter of Paris. In addition, the post-doc will benefit from full access to the clean rooms of the Paris Center consortium.
Constraints and risks
Standard risks related to clean room fabrication. Training on risk will be provided.
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