Density Saturation and Autocorrelation Characteristics of Interlayer Exciton Ensembles in MoSe2/WSe2 Heterostructures
Abstract
We investigate interlayer excitons in MoSe2/WSe2 heterostructures using time-resolved photoluminescence and second-order autocorrelation measurements across a wide range of excitation powers and bath temperatures. By analyzing the photoluminescence amplitude and lifetime of the interlayer exciton state with the lowest emission energy, we extract a corresponding density-temperature diagram. The extracted exciton density exhibits a saturation at approximately 1013cm−2, consistent with values predicted for a Mott transition of interlayer exciton ensembles in van der Waals heterostructures. Moreover, possible interpretations beyond the Mott transition are discussed. We further test whether the density limit is accompanied by a departure from classical photon statistics. The second-order autocorrelation measurements reveal that the photoluminescence maintains an emission characteristic of g(2)(0) ≈ 1 from low exciton densities up to the maximum reachable density in the investigated exciton ensembles consistent with the lowest-energy exciton ensemble obeying Poissonian statistics.
Related
- The Topography Trap: Sifting Interlayer Excitons from Strain-Related Artifacts in Real-World 2D Heterostructures
- Tunneling characteristics of twisted double bilayer graphene heterostructures
- Autocorrelation-based beam shape optimization in scanning electron microscopy
- The Pauli Lightcone: Information-Theoretic Error Mitigation Beyond the Autocorrelation
- Autocorrelation in black hole flare movies: Departures from Kerr
BibTeX
@misc{troue2026density,
title = {{Density Saturation and Autocorrelation Characteristics of Interlayer Exciton Ensembles in MoSe$_2$/WSe$_2$ Heterostructures}},
author = {Mirco Troue and Johannes Figueiredo and Alina Scheuermann and Sebastian Loy and Jonas Kiemle and Takashi Taniguchi and Kenji Watanabe and Ursula Wurstbauer and Alexander W. Holleitner},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.28158},
eprint = {2610.28158},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.28158},
}
RIS
TY - UNPB
TI - Density Saturation and Autocorrelation Characteristics of Interlayer Exciton Ensembles in MoSe_2/WSe_2 Heterostructures
AU - Mirco Troue
AU - Johannes Figueiredo
AU - Alina Scheuermann
AU - Sebastian Loy
AU - Jonas Kiemle
AU - Takashi Taniguchi
AU - Kenji Watanabe
AU - Ursula Wurstbauer
AU - Alexander W. Holleitner
PY - 2026
DA - 2026/10/20
PB - arXiv
DO - 10.48550/arxiv.2610.28158
UR - https://arxiv.org/abs/2610.28158
AB - We investigate interlayer excitons in MoSe_2/WSe_2 heterostructures using time-resolved photoluminescence and second-order autocorrelation measurements across a wide range of excitation powers and bath temperatures. By analyzing the photoluminescence amplitude and lifetime of the interlayer exciton state with the lowest emission energy, we extract a corresponding density-temperature diagram. The extracted exciton density exhibits a saturation at approximately 10^13cm^−2, consistent with values predicted for a Mott transition of interlayer exciton ensembles in van der Waals heterostructures. Moreover, possible interpretations beyond the Mott transition are discussed. We further test whether the density limit is accompanied by a departure from classical photon statistics. The second-order autocorrelation measurements reveal that the photoluminescence maintains an emission characteristic of g^(2)(0) ≈ 1 from low exciton densities up to the maximum reachable density in the investigated exciton ensembles consistent with the lowest-energy exciton ensemble obeying Poissonian statistics.
ER -