Angular Emission Properties of Strained Transition-Metal Dichalcogenides
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arXiv
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| Format: | Preprint |
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2025
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| author | Grimberg, Lee Kostyukovets, Svyatoslav Harats, Moshe G. |
| author_facet | Grimberg, Lee Kostyukovets, Svyatoslav Harats, Moshe G. |
| contents | Monolayers of transition-metal dichalcogenides have shown that uniaxial strain changes both the photoluminescence emission energy and intensity. The changes are attributed to the band-structure evolution under tensile strain where both the bandgap decreases and a direct-to-indirect transition occurs. This was shown for relatively high strains, whereas this is not the case at low strain values $<1\%$ in which in this work, we observe the erratic dependency of the photoluminescence intensity at low strain values as a function of strain. We find that the dominant physical property is the dependence of the optical-dipole emission on the curvature of the substrate. We validate the behavior of the photoluminescence intensity with experimental angular emission spectroscopy (k-space imaging). These findings are supported by Finite-Difference Time-Domain simulations, in agreement with the experimental data. Our findings present the importance of choosing the right substrate for flexible devices based on transition-metal dichalcogenides. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_13420 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Angular Emission Properties of Strained Transition-Metal Dichalcogenides Grimberg, Lee Kostyukovets, Svyatoslav Harats, Moshe G. Materials Science Mesoscale and Nanoscale Physics Optics Monolayers of transition-metal dichalcogenides have shown that uniaxial strain changes both the photoluminescence emission energy and intensity. The changes are attributed to the band-structure evolution under tensile strain where both the bandgap decreases and a direct-to-indirect transition occurs. This was shown for relatively high strains, whereas this is not the case at low strain values $<1\%$ in which in this work, we observe the erratic dependency of the photoluminescence intensity at low strain values as a function of strain. We find that the dominant physical property is the dependence of the optical-dipole emission on the curvature of the substrate. We validate the behavior of the photoluminescence intensity with experimental angular emission spectroscopy (k-space imaging). These findings are supported by Finite-Difference Time-Domain simulations, in agreement with the experimental data. Our findings present the importance of choosing the right substrate for flexible devices based on transition-metal dichalcogenides. |
| title | Angular Emission Properties of Strained Transition-Metal Dichalcogenides |
| topic | Materials Science Mesoscale and Nanoscale Physics Optics |
| url | https://arxiv.org/abs/2510.13420 |