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Optical classification of excitonic phases in molecular functionalized atomically-thin semiconductors

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Rossi,  Mariana
NOMAD, Fritz Haber Institute, Max Planck Society;

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PhysRevB.107.L041401.pdf
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Citation

Christiansen, D., Selig, M., Rossi, M., & Knorr, A. (2023). Optical classification of excitonic phases in molecular functionalized atomically-thin semiconductors. Physical Review B, 107(4): L041401. doi:10.1103/PhysRevB.107.L041401.


Cite as: https://hdl.handle.net/21.11116/0000-000C-8974-7
Abstract
The excitonic insulator is an elusive electronic phase exhibiting a correlated excitonic ground state. Materials with such a phase are expected to have intriguing properties such as excitonic high-temperature superconductivity. However, compelling evidence on the experimental realization is still missing. Here, we theoretically propose hybrids of two-dimensional semiconductors functionalized by organic molecules as prototypes of excitonic insulators, with the exemplary candidate WS2-F6TCNNQ. This material system exhibits an excitonic insulating phase at room temperature with a ground state formed by a condensate of interlayer excitons. To address an experimentally relevant situation, we calculate the corresponding phase diagram for the important parameters: temperature, gap energy, and dielectric environment. Further, to guide future experimental detection, we show how to optically characterize the different excitonic phases via far-infrared to terahertz spectroscopy valid also for monolayer materials.