Charge-depletion-enhanced WSe2 quantum emitters on gold nanogap arrays with near-unity quantum efficiency

Achieving unity quantum efficiency in single-photon emitters (SPEs) is a holy grail in quantum information science. Through plasmonic coupling it is possible to increase the quantum efficiency of SPEs by increasing the radiative decay rate, but to approach unity quantum efficiency, non-radiative dec...

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Main Authors: Cai, Hongbing, Rasmita, Abdullah, He, Ruihua, Zhang, Zhaowei, Tan, Qinghai, Chen, Disheng, Wang, Naizhou, Mu, Zhao, Eng, John J. H., She, Yongzhi, Pan, Nan, Wang, Qian, Dong, Zhaogang, Wang, Xiaoping, Wang, Juan, Miao, Yansong, Singh, Ranjan, Qiu, Cheng-Wei, Liu, Xiaogang, Gao, Weibo
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2024
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Online Access:https://hdl.handle.net/10356/179532
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1795322024-08-07T02:11:36Z Charge-depletion-enhanced WSe2 quantum emitters on gold nanogap arrays with near-unity quantum efficiency Cai, Hongbing Rasmita, Abdullah He, Ruihua Zhang, Zhaowei Tan, Qinghai Chen, Disheng Wang, Naizhou Mu, Zhao Eng, John J. H. She, Yongzhi Pan, Nan Wang, Qian Dong, Zhaogang Wang, Xiaoping Wang, Juan Miao, Yansong Singh, Ranjan Qiu, Cheng-Wei Liu, Xiaogang Gao, Weibo School of Physical and Mathematical Sciences School of Biological Sciences Institute of Materials Research and Engineering, A*STAR Centre for Quantum Technologies, NUS The Photonics Institute Centre for Disruptive Photonic Technologies (CDPT) Engineering Quantum efciency Single-photon emitters Achieving unity quantum efficiency in single-photon emitters (SPEs) is a holy grail in quantum information science. Through plasmonic coupling it is possible to increase the quantum efficiency of SPEs by increasing the radiative decay rate, but to approach unity quantum efficiency, non-radiative decay must be mitigated. Here we show that non-radiative decay in two-dimensional WSe2 quantum emitters can be electrically suppressed through charge depletion by using dual gate configurations under a large electric field. In this condition, for site-controlled SPEs in WSe2 coupled to gold nanogaps, the SPE transition quantum efficiency after gating is increased to 76.4 ± 14.6% on average, with some SPEs reaching near-unity (more than 90%) quantum efficiency. This study provides a new approach for tuning SPEs with an applied gate voltage and motivates further theoretical and experimental studies of SPE enhancement on vertically aligned nanogaps. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) National Research Foundation (NRF) This work is supported by the Singapore National Research Foundation through the QEP programme (grant numbers NRF2021-QEP2-01-P01, NRF2021-QEP2-01-P02, NRF2021-QEP2-03-P01, NRF2021-QEP2-03-P10 and NRF2022-QEP2-02-P13) and the Singapore Ministry of Education (grant number MOE-T2EP50222-0018). W.G. and Z.D. acknowledge funding from an A*STAR MTC IRG grant (project number M21K2c0116). C.-W.Q. acknowledges support from the National Research Foundation (grant number NRF2021-QEP2-03-P09 with WBS number A-8000708- 00-00 and grant number NRF-CRP26-2021-0063). 2024-08-07T02:11:36Z 2024-08-07T02:11:36Z 2024 Journal Article Cai, H., Rasmita, A., He, R., Zhang, Z., Tan, Q., Chen, D., Wang, N., Mu, Z., Eng, J. J. H., She, Y., Pan, N., Wang, Q., Dong, Z., Wang, X., Wang, J., Miao, Y., Singh, R., Qiu, C., Liu, X. & Gao, W. (2024). Charge-depletion-enhanced WSe2 quantum emitters on gold nanogap arrays with near-unity quantum efficiency. Nature Photonics, 18(8), 842-847. https://dx.doi.org/10.1038/s41566-024-01460-9 1749-4885 https://hdl.handle.net/10356/179532 10.1038/s41566-024-01460-9 2-s2.0-85196114615 8 18 842 847 en NRF2021-QEP2-01-P01 NRF2021-QEP2-01-P02 NRF2021-QEP2-03-P01 NRF2021-QEP2-03-P10 NRF2022-QEP2-02-P13 MOE-T2EP50222-0018 M21K2c0116 Nature Photonics © 2024 The Author(s), under exclusive licence to Springer Nature Limited. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Quantum efciency
Single-photon emitters
spellingShingle Engineering
Quantum efciency
Single-photon emitters
Cai, Hongbing
Rasmita, Abdullah
He, Ruihua
Zhang, Zhaowei
Tan, Qinghai
Chen, Disheng
Wang, Naizhou
Mu, Zhao
Eng, John J. H.
She, Yongzhi
Pan, Nan
Wang, Qian
Dong, Zhaogang
Wang, Xiaoping
Wang, Juan
Miao, Yansong
Singh, Ranjan
Qiu, Cheng-Wei
Liu, Xiaogang
Gao, Weibo
Charge-depletion-enhanced WSe2 quantum emitters on gold nanogap arrays with near-unity quantum efficiency
description Achieving unity quantum efficiency in single-photon emitters (SPEs) is a holy grail in quantum information science. Through plasmonic coupling it is possible to increase the quantum efficiency of SPEs by increasing the radiative decay rate, but to approach unity quantum efficiency, non-radiative decay must be mitigated. Here we show that non-radiative decay in two-dimensional WSe2 quantum emitters can be electrically suppressed through charge depletion by using dual gate configurations under a large electric field. In this condition, for site-controlled SPEs in WSe2 coupled to gold nanogaps, the SPE transition quantum efficiency after gating is increased to 76.4 ± 14.6% on average, with some SPEs reaching near-unity (more than 90%) quantum efficiency. This study provides a new approach for tuning SPEs with an applied gate voltage and motivates further theoretical and experimental studies of SPE enhancement on vertically aligned nanogaps.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Cai, Hongbing
Rasmita, Abdullah
He, Ruihua
Zhang, Zhaowei
Tan, Qinghai
Chen, Disheng
Wang, Naizhou
Mu, Zhao
Eng, John J. H.
She, Yongzhi
Pan, Nan
Wang, Qian
Dong, Zhaogang
Wang, Xiaoping
Wang, Juan
Miao, Yansong
Singh, Ranjan
Qiu, Cheng-Wei
Liu, Xiaogang
Gao, Weibo
format Article
author Cai, Hongbing
Rasmita, Abdullah
He, Ruihua
Zhang, Zhaowei
Tan, Qinghai
Chen, Disheng
Wang, Naizhou
Mu, Zhao
Eng, John J. H.
She, Yongzhi
Pan, Nan
Wang, Qian
Dong, Zhaogang
Wang, Xiaoping
Wang, Juan
Miao, Yansong
Singh, Ranjan
Qiu, Cheng-Wei
Liu, Xiaogang
Gao, Weibo
author_sort Cai, Hongbing
title Charge-depletion-enhanced WSe2 quantum emitters on gold nanogap arrays with near-unity quantum efficiency
title_short Charge-depletion-enhanced WSe2 quantum emitters on gold nanogap arrays with near-unity quantum efficiency
title_full Charge-depletion-enhanced WSe2 quantum emitters on gold nanogap arrays with near-unity quantum efficiency
title_fullStr Charge-depletion-enhanced WSe2 quantum emitters on gold nanogap arrays with near-unity quantum efficiency
title_full_unstemmed Charge-depletion-enhanced WSe2 quantum emitters on gold nanogap arrays with near-unity quantum efficiency
title_sort charge-depletion-enhanced wse2 quantum emitters on gold nanogap arrays with near-unity quantum efficiency
publishDate 2024
url https://hdl.handle.net/10356/179532
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