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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2411.13695 |
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| _version_ | 1866913582419017728 |
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| author | Chowdhury, Rup Kumar Islam, Md Samiul Barthelemy, Marie Beyer, Nicolas Engel, Lorry Pelle, Jean-Sebastien Rastei, Mircea Barsella, Alberto Fras, Francois |
| author_facet | Chowdhury, Rup Kumar Islam, Md Samiul Barthelemy, Marie Beyer, Nicolas Engel, Lorry Pelle, Jean-Sebastien Rastei, Mircea Barsella, Alberto Fras, Francois |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_13695 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Robust coherent dynamics of homogeneously limited anisotropic excitons in two-dimensional layered ReS2 Chowdhury, Rup Kumar Islam, Md Samiul Barthelemy, Marie Beyer, Nicolas Engel, Lorry Pelle, Jean-Sebastien Rastei, Mircea Barsella, Alberto Fras, Francois Mesoscale and Nanoscale Physics Optics Quantum Physics 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. |
| title | Robust coherent dynamics of homogeneously limited anisotropic excitons in two-dimensional layered ReS2 |
| topic | Mesoscale and Nanoscale Physics Optics Quantum Physics |
| url | https://arxiv.org/abs/2411.13695 |