Dipolar excitonic quantum wires at atomically sharp lateral interfaces
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912867913039872 |
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| author | Vandoolaeghe, Elie Fortuna, Francesco Chakraborty, Suman Kumar Nayak, Biswajeet Taniguchi, Takashi Watanabe, Kenji Sahoo, Prasana K. Chervy, Thibault Murthy, Puneet A. |
| author_facet | Vandoolaeghe, Elie Fortuna, Francesco Chakraborty, Suman Kumar Nayak, Biswajeet Taniguchi, Takashi Watanabe, Kenji Sahoo, Prasana K. Chervy, Thibault Murthy, Puneet A. |
| contents | One-dimensional (1D) quantum systems are a cornerstone of many-body physics. However, their realization in solids has traditionally relied on top-down methods, which are limited by structural disorder and coarse confinement. Here, we demonstrate a fundamentally distinct route: the emergence of 1D quantum matter at the atomically sharp interface between monolayer semiconductors. Using lateral $MoSe_2-WSe_2$ heterostructures, we identify interfacial excitonic quasiparticles that are bound to the crystal junction. Photoluminescence spectroscopy resolves these excitons into a ladder of discrete states, establishing nanoscopic 1D confinement at length scales of 3 nm. These excitons possess exceptional large permanent in-plane electric dipole moments exceeding e x 2 nm, and exhibit micron-scale, highly anisotropic diffusion confined to the interface. Crucially, the lateral geometry enables dynamic, in-situ reconfiguration of the exciton's internal structure. By introducing electrostatic doping, we demonstrate a collapse of the dipole moment and a 20-fold reduction in radiative lifetime. This structural tunability establishes lateral interfaces as a uniquely powerful platform for the 'bottom-up' engineering of 1D quantum matter. By enabling the dynamic tuning of wavefunctions within a single atomic monolayer, this work opens a scalable route toward 1D excitonic circuits and strongly correlated 1D bosonic phases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_24465 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dipolar excitonic quantum wires at atomically sharp lateral interfaces Vandoolaeghe, Elie Fortuna, Francesco Chakraborty, Suman Kumar Nayak, Biswajeet Taniguchi, Takashi Watanabe, Kenji Sahoo, Prasana K. Chervy, Thibault Murthy, Puneet A. Mesoscale and Nanoscale Physics One-dimensional (1D) quantum systems are a cornerstone of many-body physics. However, their realization in solids has traditionally relied on top-down methods, which are limited by structural disorder and coarse confinement. Here, we demonstrate a fundamentally distinct route: the emergence of 1D quantum matter at the atomically sharp interface between monolayer semiconductors. Using lateral $MoSe_2-WSe_2$ heterostructures, we identify interfacial excitonic quasiparticles that are bound to the crystal junction. Photoluminescence spectroscopy resolves these excitons into a ladder of discrete states, establishing nanoscopic 1D confinement at length scales of 3 nm. These excitons possess exceptional large permanent in-plane electric dipole moments exceeding e x 2 nm, and exhibit micron-scale, highly anisotropic diffusion confined to the interface. Crucially, the lateral geometry enables dynamic, in-situ reconfiguration of the exciton's internal structure. By introducing electrostatic doping, we demonstrate a collapse of the dipole moment and a 20-fold reduction in radiative lifetime. This structural tunability establishes lateral interfaces as a uniquely powerful platform for the 'bottom-up' engineering of 1D quantum matter. By enabling the dynamic tuning of wavefunctions within a single atomic monolayer, this work opens a scalable route toward 1D excitonic circuits and strongly correlated 1D bosonic phases. |
| title | Dipolar excitonic quantum wires at atomically sharp lateral interfaces |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2509.24465 |