Robust coherent dynamics of homogeneously limited anisotropic excitons in two-dimensional layered ReS2
- URL: http://arxiv.org/abs/2411.13695v1
- Date: Wed, 20 Nov 2024 20:24:41 GMT
- Title: Robust coherent dynamics of homogeneously limited anisotropic excitons in two-dimensional layered ReS2
- Authors: Rup Kumar Chowdhury, Md Samiul Islam, Marie Barthelemy, Nicolas Beyer, Lorry Engel, Jean-Sebastien Pelle, Mircea Rastei, Alberto Barsella, Francois Fras,
- Abstract summary: In-plane anisotropic excitons in two-dimensional layered semiconductors enable state-of-the-art nanophotonic applications.
Here, we report the direct measurement of coherence time for anisotropic excitons in pristine layered r decay disulfide (ReS2)
The excitonic coherence in ReS2 exhibits exceptional robustness against optical density and temperature compared to other twodimensional semiconductors.
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- Abstract: The discovery of in-plane anisotropic excitons in two-dimensional layered semiconductors enables state-of-the-art nanophotonic applications. A fundamental yet unknown parameter of these quasiparticles is the coherence time (T_2 ), which governs the quantum dephasing timescale, over which the coherent superposition of excitons can be maintained and manipulated. Here, we report the direct measurement of T_2 within the sub-picosecond range, along with multiple population decay timescales (T_1 ) at resonance for anisotropic excitons in pristine layered rhenium disulfide (ReS2). We observe a notable weak dependence on layer thickness for T_2 , and a quasi-independence for T_1 . The excitonic coherence in few-layer ReS2 exhibits exceptional robustness against optical density and temperature compared to other two-dimensional semiconductors, enabling quantum features even at room temperature. No photon echo fingerprints were observed in pristine ReS2, highlighting the homogeneous character of the anisotropic excitonic transitions and a particularly low level of disorder in exfoliated flakes. Lastly, our results for mono- to bulk-like ReS2 support a direct gap band structure regardless their layer thickness, addressing the ongoing discussion about its nature.
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