Coulomb-mediated interactions of charge-transfer excitons in TMD lateral heterostructures
Abstract
Lateral heterostructures of transition-metal dichalcogenides (TMDs) host spatially separated charge-transfer (CT) excitons. While analogous to interlayer excitons in vertical TMD heterostructures, these interfacial excitons possess much larger in-plane dipoles of several nanometers and an additional center-of-mass quantization. Here, we study the mutual interactions between these highly dipolar CT excitons on a microscopic footing. Accounting for the dipolar and quantum exchange interactions, we evaluate the experimentally accessible density-dependent energy renormalization and predict a net energy blueshift of a few meV for bound CT excitons. Interestingly, for small dipole moments, the energy renormalization displays a quadratic dependence with respect to the dipole moment, in contrast to the linear dependence found in vertical TMD heterostructures. We show that spatial energy offset and temperature are the key tuning knobs for controlling the density-dependent excitonic response. Overall, our results contribute to a better microscopic understanding of CT excitons and their interactions in lateral TMD heterostructures.
Versions
Related
- The Topography Trap: Sifting Interlayer Excitons from Strain-Related Artifacts in Real-World 2D Heterostructures
- Screening of Coulomb Interactions in MoS2 Nanoribbons: Enhanced Coulomb interactions, Antiscreening, and Edge Magnetism
- Orbital transfer reveals material-selective structure in Rydberg excitons
- Time-Dependent Density Functional Theory with Coulomb Interactions
- The effect of Coulomb interactions of thermoelectric characteristics of Marcus molecular junctions
BibTeX
@misc{sonowal2026coulombmediated,
title = {{Coulomb-mediated interactions of charge-transfer excitons in TMD lateral heterostructures}},
author = {Kabyashree Sonowal and Daniel Erkensten and Ermin Malic and Roberto Rosati},
howpublished = {arXiv},
year = {2026},
month = jun,
doi = {10.48550/arxiv.2606.04865},
eprint = {2606.04865},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.04865},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Coulomb-mediated interactions of charge-transfer excitons in TMD lateral heterostructures
AU - Kabyashree Sonowal
AU - Daniel Erkensten
AU - Ermin Malic
AU - Roberto Rosati
PY - 2026
DA - 2026/06/03
PB - arXiv
DO - 10.48550/arxiv.2606.04865
UR - https://arxiv.org/abs/2606.04865
AB - Lateral heterostructures of transition-metal dichalcogenides (TMDs) host spatially separated charge-transfer (CT) excitons. While analogous to interlayer excitons in vertical TMD heterostructures, these interfacial excitons possess much larger in-plane dipoles of several nanometers and an additional center-of-mass quantization. Here, we study the mutual interactions between these highly dipolar CT excitons on a microscopic footing. Accounting for the dipolar and quantum exchange interactions, we evaluate the experimentally accessible density-dependent energy renormalization and predict a net energy blueshift of a few meV for bound CT excitons. Interestingly, for small dipole moments, the energy renormalization displays a quadratic dependence with respect to the dipole moment, in contrast to the linear dependence found in vertical TMD heterostructures. We show that spatial energy offset and temperature are the key tuning knobs for controlling the density-dependent excitonic response. Overall, our results contribute to a better microscopic understanding of CT excitons and their interactions in lateral TMD heterostructures.
ER -