Phonon and exciton temperature-dependent properties of twisted MoS$_2$
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
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2024
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| author | Silva-Santos, Francisco da Silva, Ruben Dávila, Yuset Guerra Oliveira, Maykol Yu, Zhuohang Terrones, Mauricio Filho, Antonio Souza Alencar, Rafael Viana, Bartolomeu |
| author_facet | Silva-Santos, Francisco da Silva, Ruben Dávila, Yuset Guerra Oliveira, Maykol Yu, Zhuohang Terrones, Mauricio Filho, Antonio Souza Alencar, Rafael Viana, Bartolomeu |
| contents | In the present work, Raman and photoluminescence spectroscopies were used to study the dynamics of phonons and different excitons of MoS$_2$ bilayer under a rotation of 29$^{\circ}$ dependent of the temperature. The twisted bilayer (T-2L) of MoS$_2$ was obtained through mechanical exfoliation, and subsequently rotated using a dimethyl polysiloxane (PDMS) substrate and deterministic transferred to a SiO$_2$ substrate. The Raman spectrum of the twisted bilayer presents three peaks E$'$ (386 cm$^{-1}$), A$'_{1}$ (405 cm$^{-1}$) and an FA$'$ peak at approximately 409 cm$^{-1}$ linked to the A$'_{1}$ mode, which is attributed to a Moiré pattern phonon. Both modes (A$'_{1}$ and FA$'$) are dependent of light polarization in a way that demonstrates an effective coupling between the layers. It was also verified through the Grüneisen parameter, an increase in the anharmonicity of the mode in the E$'$ plane and a decrease the same for A$'_{1}$. In the PL measurements, the appearance of an exciton in T-2L was verified, which generated a second shoulder measured at $\approx$1.58 eV attributed to an indirect transition of an I trion. The interaction between the rotated monolayers of MoS$_{2}$ proved to be an important parameter for possible fine-tuning of the properties of bilayer samples. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_03272 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Phonon and exciton temperature-dependent properties of twisted MoS$_2$ Silva-Santos, Francisco da Silva, Ruben Dávila, Yuset Guerra Oliveira, Maykol Yu, Zhuohang Terrones, Mauricio Filho, Antonio Souza Alencar, Rafael Viana, Bartolomeu Materials Science In the present work, Raman and photoluminescence spectroscopies were used to study the dynamics of phonons and different excitons of MoS$_2$ bilayer under a rotation of 29$^{\circ}$ dependent of the temperature. The twisted bilayer (T-2L) of MoS$_2$ was obtained through mechanical exfoliation, and subsequently rotated using a dimethyl polysiloxane (PDMS) substrate and deterministic transferred to a SiO$_2$ substrate. The Raman spectrum of the twisted bilayer presents three peaks E$'$ (386 cm$^{-1}$), A$'_{1}$ (405 cm$^{-1}$) and an FA$'$ peak at approximately 409 cm$^{-1}$ linked to the A$'_{1}$ mode, which is attributed to a Moiré pattern phonon. Both modes (A$'_{1}$ and FA$'$) are dependent of light polarization in a way that demonstrates an effective coupling between the layers. It was also verified through the Grüneisen parameter, an increase in the anharmonicity of the mode in the E$'$ plane and a decrease the same for A$'_{1}$. In the PL measurements, the appearance of an exciton in T-2L was verified, which generated a second shoulder measured at $\approx$1.58 eV attributed to an indirect transition of an I trion. The interaction between the rotated monolayers of MoS$_{2}$ proved to be an important parameter for possible fine-tuning of the properties of bilayer samples. |
| title | Phonon and exciton temperature-dependent properties of twisted MoS$_2$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2402.03272 |