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Confinement of excited states in two-dimensional, in-plane, quantum heterostructures

Author

Listed:
  • Gwangwoo Kim

    (University of Pennsylvania
    Chungbuk National University)

  • Benjamin Huet

    (The Pennsylvania State University)

  • Christopher E. Stevens

    (Sensors Directorate, Wright-Patterson Air Force Base
    KBR Inc)

  • Kiyoung Jo

    (University of Pennsylvania)

  • Jeng-Yuan Tsai

    (Northeastern University)

  • Saiphaneendra Bachu

    (The Pennsylvania State University)

  • Meghan Leger

    (The Pennsylvania State University)

  • Seunguk Song

    (University of Pennsylvania)

  • Mahfujur Rahaman

    (University of Pennsylvania)

  • Kyung Yeol Ma

    (Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50)

  • Nicholas R. Glavin

    (Materials and Manufacturing Directorate, Wright-Patterson Air Force Base)

  • Hyeon Suk Shin

    (Sungkyunkwan University (SKKU)
    Sungkyunkwan University (SKKU))

  • Nasim Alem

    (The Pennsylvania State University
    The Pennsylvania State University)

  • Qimin Yan

    (Northeastern University)

  • Joshua R. Hendrickson

    (Sensors Directorate, Wright-Patterson Air Force Base)

  • Joan M. Redwing

    (The Pennsylvania State University
    The Pennsylvania State University)

  • Deep Jariwala

    (University of Pennsylvania)

Abstract

Two-dimensional (2D) semiconductors are promising candidates for optoelectronic application and quantum information processes due to their inherent out-of-plane 2D confinement. In addition, they offer the possibility of achieving low-dimensional in-plane exciton confinement, similar to zero-dimensional quantum dots, with intriguing optical and electronic properties via strain or composition engineering. However, realizing such laterally confined 2D monolayers and systematically controlling size-dependent optical properties remain significant challenges. Here, we report the observation of lateral confinement of excitons in epitaxially grown in-plane MoSe2 quantum dots (~15-60 nm wide) inside a continuous matrix of WSe2 monolayer film via a sequential epitaxial growth process. Various optical spectroscopy techniques reveal the size-dependent exciton confinement in the MoSe2 monolayer quantum dots with exciton blue shift (12-40 meV) at a low temperature as compared to continuous monolayer MoSe2. Finally, single-photon emission (g2(0) ~ 0.4) was also observed from the smallest dots at 1.6 K. Our study opens the door to compositionally engineered, tunable, in-plane quantum light sources in 2D semiconductors.

Suggested Citation

  • Gwangwoo Kim & Benjamin Huet & Christopher E. Stevens & Kiyoung Jo & Jeng-Yuan Tsai & Saiphaneendra Bachu & Meghan Leger & Seunguk Song & Mahfujur Rahaman & Kyung Yeol Ma & Nicholas R. Glavin & Hyeon , 2024. "Confinement of excited states in two-dimensional, in-plane, quantum heterostructures," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50653-x
    DOI: 10.1038/s41467-024-50653-x
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    References listed on IDEAS

    as
    1. Artur Branny & Santosh Kumar & Raphaël Proux & Brian D Gerardot, 2017. "Deterministic strain-induced arrays of quantum emitters in a two-dimensional semiconductor," Nature Communications, Nature, vol. 8(1), pages 1-7, August.
    2. Huan Zhao & Michael T. Pettes & Yu Zheng & Han Htoon, 2021. "Site-controlled telecom-wavelength single-photon emitters in atomically-thin MoTe2," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    3. Annemarie L. Exarhos & David A. Hopper & Raj N. Patel & Marcus W. Doherty & Lee C. Bassett, 2019. "Magnetic-field-dependent quantum emission in hexagonal boron nitride at room temperature," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
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