Room-temperature local strain control of moiré excitons in MoS2/WSe2 heterobilayers
Abstract
Moiré superlattices in heterobilayers of atomically thin transition metal dichalcogenides provide a versatile platform for exploring quantum many-body physics as they can trap excitons, leading to the formation of quantized moiré exciton states. However, such moiré excitons have been predominantly studied at cryogenic temperatures, which severely limits their practical applications. Here, we demonstrate room-temperature activation and control of moiré excitons in MoS2/WSe2 heterobilayers using local strain engineering. Applying mechanical strain with a modified atomic force microscopy tip, we observe a series of resonances attributed to interlayer exciton states confined in the moiré potential. Power-dependent photoluminescence measurements elucidate the population dynamics of the moiré exciton states, while controlled local strain enables continuous tuning of their emission wavelength to the center of the second telecom window. We provide a theoretical model that captures all experimentally observed features, including the unconventional spectral shape of the moiré exciton emission. Our findings establish local tip-induced strain as a powerful tool for the on-demand manipulation of moiré excitons, paving the way for room-temperature quantum excitonic devices.
Related
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- Dark-State Coherent Control of Excitons in TMD Monolayers: A Reduced Intravalley Lindblad Framework for WSe2
BibTeX
@misc{oskolkova2026roomtemperature,
title = {{Room-temperature local strain control of moiré excitons in MoS$_2$/WSe$_2$ heterobilayers}},
author = {T. O. Oskolkova and Y. Koo and A. A. Shubnic and I. Yu. Chestnov and I. Choi and C. Cheng and D. Huang and T. Jiang and K. -D. Park and I. V. Iorsh and V. Kravtsov},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.02340},
eprint = {2609.02340},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.02340},
}
RIS
TY - UNPB
TI - Room-temperature local strain control of moiré excitons in MoS_2/WSe_2 heterobilayers
AU - T. O. Oskolkova
AU - Y. Koo
AU - A. A. Shubnic
AU - I. Yu. Chestnov
AU - I. Choi
AU - C. Cheng
AU - D. Huang
AU - T. Jiang
AU - K. -D. Park
AU - I. V. Iorsh
AU - V. Kravtsov
PY - 2026
DA - 2026/09/02
PB - arXiv
DO - 10.48550/arxiv.2609.02340
UR - https://arxiv.org/abs/2609.02340
AB - Moiré superlattices in heterobilayers of atomically thin transition metal dichalcogenides provide a versatile platform for exploring quantum many-body physics as they can trap excitons, leading to the formation of quantized moiré exciton states. However, such moiré excitons have been predominantly studied at cryogenic temperatures, which severely limits their practical applications. Here, we demonstrate room-temperature activation and control of moiré excitons in MoS_2/WSe_2 heterobilayers using local strain engineering. Applying mechanical strain with a modified atomic force microscopy tip, we observe a series of resonances attributed to interlayer exciton states confined in the moiré potential. Power-dependent photoluminescence measurements elucidate the population dynamics of the moiré exciton states, while controlled local strain enables continuous tuning of their emission wavelength to the center of the second telecom window. We provide a theoretical model that captures all experimentally observed features, including the unconventional spectral shape of the moiré exciton emission. Our findings establish local tip-induced strain as a powerful tool for the on-demand manipulation of moiré excitons, paving the way for room-temperature quantum excitonic devices.
ER -