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INducing TRionic gaIn in two-dimensional semicoNductors by local StraIn and Charge manipulation

Project description

Study investigates trion formation and properties in 2D materials

Coherent light sources are playing an essential role in countless everyday technologies. The increasing demand to reduce the energy consumption is pushing the laser technology toward the design of miniaturised coherent light sources operating with minimal power. In this context, full control over trion density (i.e. localised excitations consisting of three charged particles) in 2D semiconductors could enable optical amplification and lasing at unprecedented excitation levels. Funded by the Marie Skłodowska-Curie Actions program, the INTRINSIC project aims to further understand photoexcitation-based trion formation, their concentration and stability in functionalized 2D semiconductors by controlling carrier doping, defect density, and strain fields at the nanoscale level.


The ability to manipulate excitonic complexes in 2D-materials is of fundamental importance for the development of excitonic based optoelectronic devices operating in low-carrier density, low-power regimes. Correlating locally variable quantities with emission properties of excitonic complexes on sub-diffraction length scale could enable on-demand control of the mutual conversion between excitons and trions. In particular, control over trion density upon photoexcitation in a functionalized 2D-material disclose the possibility to achieve trionic optical gain, that is, a condition of optical gain sustained by the difference between trion and pre-doped electron density. As a peculiarity, trionic optical gain does not require global population inversion common to optical gain mechanisms of conventional semiconductors. Therefore, trion density control could enable optical amplification and lasing at unprecedented low levels of excitation. To this end, we aim to understand the photoexcitation dependent trion formation process, their abundance and stability upon variation of local quantities such as carrier doping, defects density and strain fields in 2D-materials. To pursue this goal we will implement a structural /spectroscopic correlated approach based on hyperspectral nano-imaging and far-field cryo-microscopy of 2D monolayers transferred on a plasmonic nanopillars array with controlled levels of charge doping and strain. Demonstration of trionic optical gain in such conditions will provide the necessary requirement for achieving trionic lasing. Laser feedback will be then realized by engineering the surface lattice resonance of a plasmonic nanopillar cavity to match the trionic peak gain wavelength.


Net EU contribution
€ 265 099,20
Via morego 30
16163 Genova

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Nord-Ovest Liguria Genova
Activity type
Research Organisations
EU contribution
No data

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