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| Autores principales: | , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2511.20398 |
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| _version_ | 1866917103714435072 |
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| author | Westenberg, Laurens J. M. Eek, Lumen Verbakel, Jort D. Vonk, Kevin Borggreve, Stijn J. H. Watanabe, Kenji Taniguchi, Takashi de Boeij, Paul Arouca, Rodrigo Smith, Cristiane Morais Bampoulis, Pantelis |
| author_facet | Westenberg, Laurens J. M. Eek, Lumen Verbakel, Jort D. Vonk, Kevin Borggreve, Stijn J. H. Watanabe, Kenji Taniguchi, Takashi de Boeij, Paul Arouca, Rodrigo Smith, Cristiane Morais Bampoulis, Pantelis |
| contents | Twisted two-dimensional semiconductors generate a moiré landscape that confines excitons (bound electron-hole pairs) into programmable lattices, offering routes to efficient light sources, sensing, and room-temperature information processing. However, direct real-space imaging of confined excitonic species within a moiré unit cell remains challenging; existing claims are inferred from spatially averaged far-field signals that are intrinsically insufficient to resolve nanometre-scale variations. Here, we imaged excitons across the moiré of a 2$^{\circ}$ twisted bilayer MoS$_2$ with nanometre resolution using room-temperature photocurrent atomic force microscopy. We directly resolved site-selective confinement: direct and indirect excitons localize at different stacking registries of the moiré, with contrast governed by alignment between site-selective generation and confinement minima. A Wannier-based moiré-exciton model reproduces the measured energies and the moiré-induced localization of the exciton wavefunction. These species-specific, unit-cell-resolved measurements constrain microscopic models of moiré excitons, provide benchmarks for excitonic order, and establish a device-compatible route to engineering excitonic lattices in van der Waals heterostructures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_20398 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Real-Space Imaging of Moiré-Confined Excitons in Twisted Bilayer MoS$_2$ Westenberg, Laurens J. M. Eek, Lumen Verbakel, Jort D. Vonk, Kevin Borggreve, Stijn J. H. Watanabe, Kenji Taniguchi, Takashi de Boeij, Paul Arouca, Rodrigo Smith, Cristiane Morais Bampoulis, Pantelis Mesoscale and Nanoscale Physics Materials Science Twisted two-dimensional semiconductors generate a moiré landscape that confines excitons (bound electron-hole pairs) into programmable lattices, offering routes to efficient light sources, sensing, and room-temperature information processing. However, direct real-space imaging of confined excitonic species within a moiré unit cell remains challenging; existing claims are inferred from spatially averaged far-field signals that are intrinsically insufficient to resolve nanometre-scale variations. Here, we imaged excitons across the moiré of a 2$^{\circ}$ twisted bilayer MoS$_2$ with nanometre resolution using room-temperature photocurrent atomic force microscopy. We directly resolved site-selective confinement: direct and indirect excitons localize at different stacking registries of the moiré, with contrast governed by alignment between site-selective generation and confinement minima. A Wannier-based moiré-exciton model reproduces the measured energies and the moiré-induced localization of the exciton wavefunction. These species-specific, unit-cell-resolved measurements constrain microscopic models of moiré excitons, provide benchmarks for excitonic order, and establish a device-compatible route to engineering excitonic lattices in van der Waals heterostructures. |
| title | Real-Space Imaging of Moiré-Confined Excitons in Twisted Bilayer MoS$_2$ |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2511.20398 |