Exciton coherence propagation measured with non-local four-wave mixing micro-spectroscopy

Abstract

Coherence transfer is a multi-disciplinary topic of interest, including chemistry, biology and physics. In quantum technologies, achieving non-local coherent coupling between solid-state qubits is of the utmost importance. Here, we demonstrate that excitons - i.e. electron-hole pairs bound by the Coulomb force within a quantum well - can act as a medium for mesoscopic optical coherence transfer in semiconductors. To this end, we use a femtosecond laser pulse to resonantly generate excitons within the light cone. These excitons can then either recombine radiatively or scatter out of the light cone, gaining an in-plane momentum in the process. In samples without disorder, such as the CdTe quantum wells used here, the resulting fast excitons can diffuse over mesoscopic distances before recombining radiatively. Using coherent nonlinear micro-spectroscopy, we carry out exciton time-of-flight measurements. Specifically, we monitor the spatio-temporal propagation of launched exciton wave packets, selectively observing their coherence or density on a scale of up to 10μm. Our proof-of-principle experiment demonstrates that free excitons inherit a phase modulation from the optical pulsed excitation and can generate coherent links within excitonic circuits, offerring a higher level of miniaturisation and compactness than photonic or polaritonic architectures.

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BibTeX RIS

BibTeX

@article{raczynski2026exciton,
  title = {{Exciton coherence propagation measured with non-local four-wave mixing micro-spectroscopy}},
  author = {Mateusz Raczyński and Amadeusz Dydniański and Karolina Ewa Połczyńska and Gabriela Szwed and Adam Szczerba and Jin-Woo Jung and Gilles Nogues and Wolfgang Langbein and Piotr Kossacki and Wojciech Pacuski and Jacek Kasprzak},
  journal = {Optica},
  year = {2026},
  month = sep,
  doi = {10.1364/optica.582443},
  eprint = {2601.07549},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05765916v1},
  note = {CC BY 4.0},
}

RIS

TY  - JOUR
TI  - Exciton coherence propagation measured with non-local four-wave mixing micro-spectroscopy
AU  - Mateusz Raczyński
AU  - Amadeusz Dydniański
AU  - Karolina Ewa Połczyńska
AU  - Gabriela Szwed
AU  - Adam Szczerba
AU  - Jin-Woo Jung
AU  - Gilles Nogues
AU  - Wolfgang Langbein
AU  - Piotr Kossacki
AU  - Wojciech Pacuski
AU  - Jacek Kasprzak
PY  - 2026
DA  - 2026/09/30
JO  - Optica
DO  - 10.1364/optica.582443
UR  - https://hal.science/hal-05765916v1
AB  - Coherence transfer is a multi-disciplinary topic of interest, including chemistry, biology and physics. In quantum technologies, achieving non-local coherent coupling between solid-state qubits is of the utmost importance. Here, we demonstrate that excitons - i.e. electron-hole pairs bound by the Coulomb force within a quantum well - can act as a medium for mesoscopic optical coherence transfer in semiconductors. To this end, we use a femtosecond laser pulse to resonantly generate excitons within the light cone. These excitons can then either recombine radiatively or scatter out of the light cone, gaining an in-plane momentum in the process. In samples without disorder, such as the CdTe quantum wells used here, the resulting fast excitons can diffuse over mesoscopic distances before recombining radiatively. Using coherent nonlinear micro-spectroscopy, we carry out exciton time-of-flight measurements. Specifically, we monitor the spatio-temporal propagation of launched exciton wave packets, selectively observing their coherence or density on a scale of up to 10μm. Our proof-of-principle experiment demonstrates that free excitons inherit a phase modulation from the optical pulsed excitation and can generate coherent links within excitonic circuits, offerring a higher level of miniaturisation and compactness than photonic or polaritonic architectures.
SN  - 2334-2536
SN  - 2334-2536
ER  -

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