Local tuning of Rydberg exciton energies in nanofabricated Cu2O pillars

Anindya Sundar Paul; Sai Kiran Rajendran; D Ziemkiewicz; T Volz; Hamid Ohadi

doi:10.1038/s43246-024-00481-9

Local tuning of Rydberg exciton energies in nanofabricated Cu₂O pillars

Anindya Sundar Paul, Sai Kiran Rajendran^*, D Ziemkiewicz, T Volz, Hamid Ohadi^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

Rydberg excitons in Cu₂O feature giant optical nonlinearities. To exploit these nonlinearities for quantum applications, the confinement must match the Rydberg blockade size, which in Cu₂O could be as large as a few microns. Here, in a top-down approach, we show how exciton confinement can be realised by focused-ion-beam etching of a polished bulk Cu₂O crystal without noticeable degradation of the excitonic properties. The etching of the crystal to micron sizes allows for tuning the energies of Rydberg excitons locally, and precisely, by optically induced temperature change. These results pave the way for exploiting the large nonlinearities of Rydberg excitons in micropillars for making non-classical light sources, while the precise tuning of their emission energy opens up a viable pathway for realizing a scalable photonic quantum simulation platform.

Original language	English
Article number	43
Number of pages	8
Journal	Communications Materials
Volume	5
Issue number	43
DOIs	https://doi.org/10.1038/s43246-024-00481-9 https://doi.org/10.1038/s43246-024-00481-9
Publication status	Published - 28 Mar 2024

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Cite this

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title = "Local tuning of Rydberg exciton energies in nanofabricated Cu2O pillars",

abstract = "Rydberg excitons in Cu2O feature giant optical nonlinearities. To exploit these nonlinearities for quantum applications, the confinement must match the Rydberg blockade size, which in Cu2O could be as large as a few microns. Here, in a top-down approach, we show how exciton confinement can be realised by focused-ion-beam etching of a polished bulk Cu2O crystal without noticeable degradation of the excitonic properties. The etching of the crystal to micron sizes allows for tuning the energies of Rydberg excitons locally, and precisely, by optically induced temperature change. These results pave the way for exploiting the large nonlinearities of Rydberg excitons in micropillars for making non-classical light sources, while the precise tuning of their emission energy opens up a viable pathway for realizing a scalable photonic quantum simulation platform.",

author = "Paul, \{Anindya Sundar\} and Rajendran, \{Sai Kiran\} and D Ziemkiewicz and T Volz and Hamid Ohadi",

note = "Funding: This work was supported by the EPSRC through grant No. EP/S014403/1, by The Royal Society through RGS\textbackslash{}R2\textbackslash{}192174, and by the Leverhulme Trust through grant No. RPG-2022-188. A.S.P. acknowledges the PhD scholarship from University of St Andrews and Macquarie University and the support of Sydney Quantum Academy, Sydney, NSW, Australia for The SQA Supplementary Scholarship. S.K.R. acknowledges the Carnegie Trust for the Universities of Scotland Research Incentive Grant RIG009823. T.V. acknowledges support through the ARC Centre of Excellence for Engineered Quantum Systems (CE170100009). The authors acknowledge the support of EPSRC Capital for Great Technologies Grant EP/L017008/1 and the EPSRC Strategic Equipment Resource Grant EP/R023751/1 for the use of the FIB equipment for the fabrication of the pillars.",

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doi = "10.1038/s43246-024-00481-9",

language = "English",

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AU - Rajendran, Sai Kiran

AU - Ziemkiewicz, D

AU - Volz, T

AU - Ohadi, Hamid

N1 - Funding: This work was supported by the EPSRC through grant No. EP/S014403/1, by The Royal Society through RGS\R2\192174, and by the Leverhulme Trust through grant No. RPG-2022-188. A.S.P. acknowledges the PhD scholarship from University of St Andrews and Macquarie University and the support of Sydney Quantum Academy, Sydney, NSW, Australia for The SQA Supplementary Scholarship. S.K.R. acknowledges the Carnegie Trust for the Universities of Scotland Research Incentive Grant RIG009823. T.V. acknowledges support through the ARC Centre of Excellence for Engineered Quantum Systems (CE170100009). The authors acknowledge the support of EPSRC Capital for Great Technologies Grant EP/L017008/1 and the EPSRC Strategic Equipment Resource Grant EP/R023751/1 for the use of the FIB equipment for the fabrication of the pillars.

PY - 2024/3/28

Y1 - 2024/3/28

N2 - Rydberg excitons in Cu2O feature giant optical nonlinearities. To exploit these nonlinearities for quantum applications, the confinement must match the Rydberg blockade size, which in Cu2O could be as large as a few microns. Here, in a top-down approach, we show how exciton confinement can be realised by focused-ion-beam etching of a polished bulk Cu2O crystal without noticeable degradation of the excitonic properties. The etching of the crystal to micron sizes allows for tuning the energies of Rydberg excitons locally, and precisely, by optically induced temperature change. These results pave the way for exploiting the large nonlinearities of Rydberg excitons in micropillars for making non-classical light sources, while the precise tuning of their emission energy opens up a viable pathway for realizing a scalable photonic quantum simulation platform.

AB - Rydberg excitons in Cu2O feature giant optical nonlinearities. To exploit these nonlinearities for quantum applications, the confinement must match the Rydberg blockade size, which in Cu2O could be as large as a few microns. Here, in a top-down approach, we show how exciton confinement can be realised by focused-ion-beam etching of a polished bulk Cu2O crystal without noticeable degradation of the excitonic properties. The etching of the crystal to micron sizes allows for tuning the energies of Rydberg excitons locally, and precisely, by optically induced temperature change. These results pave the way for exploiting the large nonlinearities of Rydberg excitons in micropillars for making non-classical light sources, while the precise tuning of their emission energy opens up a viable pathway for realizing a scalable photonic quantum simulation platform.

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DO - 10.1038/s43246-024-00481-9

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JO - Communications Materials

JF - Communications Materials

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M1 - 43

ER -

Local tuning of Rydberg exciton energies in nanofabricated Cu₂O pillars

Abstract

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