Dipolar Excitonic Quantum Wires at Atomically Sharp Lateral Interfaces
4 affiliations
- 1ETH Zürich , , ,
- 2Indian Institute of Technology , , ,
- 3National Institute for Materials Science , Namiki 1-1 , , ,
- 4NTT Research, Inc. , 940 Stewart Dr , , ,
Abstract
One-dimensional (1D) quantum systems are a cornerstone of condensed matter 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 new route to low-dimensional systems: the emergence of 1D quantum matter at the atomically sharp interface between monolayer semiconductors. Using lateral MoSe2–WSe2 heterostructures, we identify interfacial excitonic quasiparticles bound to the crystal junction. Photoluminescence spectroscopy resolves these excitons into a ladder of discrete states, establishing 1D confinement at length scales ≲3 nm. These excitons possess exceptionally large permanent in-plane electric dipole moments exceeding e × 2 nm, and exhibit micron-scale anisotropic diffusion confined to the interface. By introducing electrostatic doping, we demonstrate a collapse of the dipole moment and a 20-fold reduction in lifetime. By dynamically tuning wavefunctions within a single atomic monolayer, we open a scalable route toward engineering 1D quantum matter.
Related
- Engineering optoelectronic and excitonic properties in carbon quantum dots via defect encoding: a first-principles study
- Cross-Linking Simulation at Metal Oxide-Thermoset Interfaces Using Quantum Chemical and Molecular Dynamics Methods
- Plasmonic Coupling Within Atomically Precise Nanocluster Dimers for Engineering Hot-Carrier Generation and Molecular Activation
- Symmetry Breaking Drives Twisted Prismatic Evolution in Atomically Precise Copper Nanoclusters
- Atomically Precise Au ₂₂ (Lys-Cys-Lys) ₁₆ Gold Nanocluster as Type I Photosensitizer: ROS Generation Mechanism
BibTeX
@article{vandoolaeghe2026dipolar,
title = {{Dipolar Excitonic Quantum Wires at Atomically Sharp Lateral Interfaces}},
author = {Elie Vandoolaeghe and Francesco Fortuna and Suman Kumar Chakraborty and Biswajeet Nayak and Takashi Taniguchi and Kenji Watanabe and Prasana Kumar Sahoo and Thibault Chervy and Puneet A. Murthy},
journal = {Nano Letters},
year = {2026},
month = sep,
doi = {10.1021/acs.nanolett.6c02624},
url = {https://doi.org/10.1021/acs.nanolett.6c02624},
note = {CC BY},
}
RIS
TY - JOUR
TI - Dipolar Excitonic Quantum Wires at Atomically Sharp Lateral Interfaces
AU - Elie Vandoolaeghe
AU - Francesco Fortuna
AU - Suman Kumar Chakraborty
AU - Biswajeet Nayak
AU - Takashi Taniguchi
AU - Kenji Watanabe
AU - Prasana Kumar Sahoo
AU - Thibault Chervy
AU - Puneet A. Murthy
PY - 2026
DA - 2026/09/15
JO - Nano Letters
DO - 10.1021/acs.nanolett.6c02624
UR - https://doi.org/10.1021/acs.nanolett.6c02624
AB - One-dimensional (1D) quantum systems are a cornerstone of condensed matter 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 new route to low-dimensional systems: the emergence of 1D quantum matter at the atomically sharp interface between monolayer semiconductors. Using lateral MoSe2–WSe2 heterostructures, we identify interfacial excitonic quasiparticles bound to the crystal junction. Photoluminescence spectroscopy resolves these excitons into a ladder of discrete states, establishing 1D confinement at length scales ≲3 nm. These excitons possess exceptionally large permanent in-plane electric dipole moments exceeding e × 2 nm, and exhibit micron-scale anisotropic diffusion confined to the interface. By introducing electrostatic doping, we demonstrate a collapse of the dipole moment and a 20-fold reduction in lifetime. By dynamically tuning wavefunctions within a single atomic monolayer, we open a scalable route toward engineering 1D quantum matter.
SN - 1530-6984
SN - 1530-6992
ER -