Robust trapping of 2D excitons in an engineered 1D potential from proximal ferroelectric domain walls
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866913747184910336 |
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| author | Soubelet, Pedro Tong, Yao Hernandez, Asier Astaburuaga Ji, Peirui Gallo, Katia Stier, Andreas V. Finley, Jonathan J. |
| author_facet | Soubelet, Pedro Tong, Yao Hernandez, Asier Astaburuaga Ji, Peirui Gallo, Katia Stier, Andreas V. Finley, Jonathan J. |
| contents | We investigate the confinement of neutral excitons in a one-dimensional (1D) potential, engineered by proximizing hBN-encapsulated monolayer MoSe$_2$ to ferroelectric domain walls (DW) in periodically poled LiNbO$_3$. Our device exploits the nanometer scale in-plane electric field gradient at the DW to induce the dipolar exciton confinement via the Stark effect. Spatially resolved photoluminescence (PL) spectroscopy reveals the emergence of narrow emission lines redshifted from the MoSe$_2$ neutral exciton by up to $\sim100\,$meV, depending on the sample structure. The spatial distribution, excitation energy response and polarization properties of the emission is consistent with signatures of 1D-confined excitons. The large electric field gradients accessible via proximal ferroelectric systems open up new avenues for the creation of robust quantum-confined excitons in atomically thin materials and their heterostructures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_15628 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Robust trapping of 2D excitons in an engineered 1D potential from proximal ferroelectric domain walls Soubelet, Pedro Tong, Yao Hernandez, Asier Astaburuaga Ji, Peirui Gallo, Katia Stier, Andreas V. Finley, Jonathan J. Mesoscale and Nanoscale Physics We investigate the confinement of neutral excitons in a one-dimensional (1D) potential, engineered by proximizing hBN-encapsulated monolayer MoSe$_2$ to ferroelectric domain walls (DW) in periodically poled LiNbO$_3$. Our device exploits the nanometer scale in-plane electric field gradient at the DW to induce the dipolar exciton confinement via the Stark effect. Spatially resolved photoluminescence (PL) spectroscopy reveals the emergence of narrow emission lines redshifted from the MoSe$_2$ neutral exciton by up to $\sim100\,$meV, depending on the sample structure. The spatial distribution, excitation energy response and polarization properties of the emission is consistent with signatures of 1D-confined excitons. The large electric field gradients accessible via proximal ferroelectric systems open up new avenues for the creation of robust quantum-confined excitons in atomically thin materials and their heterostructures. |
| title | Robust trapping of 2D excitons in an engineered 1D potential from proximal ferroelectric domain walls |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2503.15628 |