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Electronic, vibronic, and magnetic properties of a carbon radical anion in 2D WS<sub>2</sub>

ORAL

Abstract

Two-dimensional transition metal dichalcogenides (2D-TMDs) are a promising class of materials with many novel applications due to a variety of electronic and optoelectronic properties combined with a synthetic flexibility and tunability. In particular, point defects within these materials have been identified as potential qubits for quantum information applications. In order to realize this goal, these defects must be characterized and controlled.

Here we use scanning tunneling microscopy and spectroscopy (STM/S) and CO functionalized tip atomic force microscopy (AFM) in combination with ab initio calculations to characterize a carbon point defect in WS2.[1] Previously, we identified a C-H complex as a common impurity in synthetic TMDs, which can also be doped with a methane plasma.[2] With the STM tip, we are able to selectively remove the hydrogen atom, resulting in a single, negatively charged carbon atom with a spin 1/2.[3] Here we demonstrate the ability to generate on demand, spin ½ centers with atomic precision and characterize the electronic and vibronic properties of these carbon point defects.

[1] Schuler, B., et al. ACS Nano 13, 9 (2019)
[2] Cochrane, K.A., et al. 2D Materials 7, 3 (2020)
[3] Cochrane, K.A., et al. arXiv preprint arXiv:2008.12196 (2020)

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Presenters

  • Katherine Cochrane

    Lawrence Berkeley National Laboratory

Authors

  • Katherine Cochrane

    Lawrence Berkeley National Laboratory

  • Jun-Ho Lee

    Physics, University of California at Berkeley, Lawrence Berkeley National Laboratory

  • Christoph Kastl

    Technical University of Munich

  • Jonah Haber

    Physics, University of California at Berkeley, Physics, University of California, Berkeley, Department of Physics, University of California, Berkeley, Department of Physics, University of California Berkeley, University of California Berkeley

  • Tianyi Zhang

    The Penn State University

  • Azimkhan Kozhakhmetov

    The Penn State University

  • Joshua Robinson

    The Penn State University, Pennsylvania State University

  • Mauricio Terrones

    Pennsylvania State University, The Penn State University

  • Jascha Repp

    Universität Regensburg

  • Jeffrey Neaton

    Lawrence Berkeley National Laboratory, Physics, University of California at Berkeley, Physics, University of California, Berkeley, University of California, Berkeley; Lawrence Berkeley National Lab; Kavli Energy NanoScience Institute at Berkeley, Department of Physics, University of California Berkeley, University of California, Berkeley, Physics, University of California, Berkeley, and Materials Sciences Division, Lawrence Berkeley National Laboratory, Molecular Foundry, Lawrence Berkeley National Laboratory, University of California Berkeley

  • Alexander Weber-Bargioni

    Lawrence Berkeley National Laboratory

  • Bruno Schuler

    EMPA