Crystal-phase quantum dots in AlGaAs nanowires
Abstract
Crystal-phase quantum dots (CPQDs)unicodex2014quantum dots in nanowires defined by crystal structure rather than material compositionunicodex2014constitute the only platform capable of fabricating quantum-dot arrays with the ultimate precision of a single atomic layer. This intrinsic control yields perfectly aligned quantum dots with atomically sharp interfaces, providing a unique pathway toward scalable quantum-dot-based photonic quantum technologies. To date, CPQDs have been studied primarily in binary semiconductors, such as InP and GaAs, where their emission linewidths are typically in the meV range, thereby limiting their technological potential. Here, we report, for the first time, CPQDs in AlGaAs nanowires and show bright single-photon emission with linewidths as narrow as 61 μeV and low background emission, demonstrating optical quality well beyond typical CPQDs. We attribute this performance to a type-I band alignment, as suggested by an exciton lifetime of 1 ns, significantly shorter than that typically observed in type-II CPQDs. Additionally, we observe an exciton fine-structure splitting and a Zeeman splitting, as commonly observed in standard type-I self-assembled quantum dots.
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BibTeX
@misc{radhakrishnan2026crystalphase,
title = {{Crystal-phase quantum dots in AlGaAs nanowires}},
author = {Rohan Radhakrishnan and Rodion Reznik and Gilles Patriarche and Lorenzo Leandro and Igor Ilkiv and Anna Andreeva and Artem Khrebtov and George Cirlin and Nika Akopian},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.28353},
eprint = {2608.28353},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.28353},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Crystal-phase quantum dots in AlGaAs nanowires
AU - Rohan Radhakrishnan
AU - Rodion Reznik
AU - Gilles Patriarche
AU - Lorenzo Leandro
AU - Igor Ilkiv
AU - Anna Andreeva
AU - Artem Khrebtov
AU - George Cirlin
AU - Nika Akopian
PY - 2026
DA - 2026/08/28
PB - arXiv
DO - 10.48550/arxiv.2608.28353
UR - https://arxiv.org/abs/2608.28353
AB - Crystal-phase quantum dots (CPQDs)unicodex2014quantum dots in nanowires defined by crystal structure rather than material compositionunicodex2014constitute the only platform capable of fabricating quantum-dot arrays with the ultimate precision of a single atomic layer. This intrinsic control yields perfectly aligned quantum dots with atomically sharp interfaces, providing a unique pathway toward scalable quantum-dot-based photonic quantum technologies. To date, CPQDs have been studied primarily in binary semiconductors, such as InP and GaAs, where their emission linewidths are typically in the meV range, thereby limiting their technological potential. Here, we report, for the first time, CPQDs in AlGaAs nanowires and show bright single-photon emission with linewidths as narrow as 61 μeV and low background emission, demonstrating optical quality well beyond typical CPQDs. We attribute this performance to a type-I band alignment, as suggested by an exciton lifetime of 1 ns, significantly shorter than that typically observed in type-II CPQDs. Additionally, we observe an exciton fine-structure splitting and a Zeeman splitting, as commonly observed in standard type-I self-assembled quantum dots.
ER -