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Visualizing Electrically Driven Photon Emission from Individual Defects in WS<sub>2</sub> with Atomic Resolution

Invited

Abstract

Point defects in two-dimensional semiconductors are exciting atomic quantum systems. Recently, we established the correlation of atomic structure, electronic and optical properties of native point defects in monolayer WS2 [1] and MoSe2 [2] using atomically resolved scanning probe microscopy techniques. We identified isoelectronic chalcogen and transition metal substitutions as the dominant defects based on their unique electronic fingerprint [1,2]. Sulfur vacancies that are absent in as-grown samples could be selectively generated by high temperature annealing in vacuum and exhibit strong spin-orbit splitting [3].
Here we demonstrate electrically driven photon emission from individual, atomically defined defects in a 2D semiconductor [4]. We show atomically resolved luminescence maps from sulfur vacancy defects and native chromium substituents. The widely tunable optical emission generated by charge carrier injection into localized defect states in a 2D material is a powerful platform for electrically driven single-photon emission.

[1] B. Schuler et al., ACS Nano 13, 10520 (2019)
[2] S. Barja et al., Nat. Commun. 10, 3382 (2019)
[3] B. Schuler et al., Phys. Rev. Lett. 123, 076801 (2019)
[4] B. Schuler et al., arxiv: 1910.04612 (2019)

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Presenters

  • Bruno Schuler

    Lawrence Berkeley National Laboratory, Molecular Foundry, Lawrence Berkeley National Laboratory

Authors

  • Bruno Schuler

    Lawrence Berkeley National Laboratory, Molecular Foundry, Lawrence Berkeley National Laboratory

  • Katherine Cochrane

    Lawrence Berkeley National Laboratory, Molecular Foundry, Lawrence Berkeley National Laboratory

  • Jun-Ho Lee

    Lawrence Berkeley National Laboratory, Physics, UC Berkeley

  • Christoph Kastl

    Technical University Munich, Lawrence Berkeley National Laboratory

  • Ed Barnard

    Lawrence Berkeley National Laboratory, The Molecular Foundry, Lawrence Berkeley National Laboratory

  • Ed Wong

    Lawrence Berkeley National Laboratory, The Molecular Foundry, Lawrence Berkeley National Laboratory

  • Nicholas J Borys

    Montana State University, Department of Physics, Montana State University, Montana State University, Bozeman

  • Adam Schwartzberg

    Lawrence Berkeley National Laboratory

  • Frank Ogletree

    Lawrence Berkeley National Laboratory

  • Jeffrey B Neaton

    Lawrence Berkeley National Laboratory, Physics, UC Berkeley, Kavli Energy Nanoscience Institute at Berkeley, Physics, University of California, Berkeley, Department of Physics, University of California, Berkeley, University of California, Berkeley; Molecular Foundry, Lawrence Berkeley National Laboratory; Kavli Energy Nanosciences Institute at Berkeley, University of California, Berkeley, Lawrence Berkeley National Lab

  • Javier Garcia de Abajo

    ICFO – The Institute of Photonic Sciences, ICFO (Barcelona), ICREA

  • Alexander Weber-Bargioni

    Lawrence Berkeley National Laboratory, Molecular Foundry, Lawrence Berkeley National Laboratory