journal article·2022-11-10Open access

Ultra-Sensitive Extinction Measurements of Optically Active Defects in Monolayer MoS2

Florian Sigger, Ines Amersdorffer, Alexander Hötger, Manuel Nutz, Jonas Kiemle, Takashi Taniguchi, Kenji Watanabe, Michael Förg, Jonathan Noe, Jonathan J. Finley, Alexander Högele, Alexander W. Holleitner, Thomas Hümmer, David Hunger, Christoph Kastl

Abstract

We utilize cavity-enhanced extinction spectroscopy to directly quantify the optical absorption of defects in MoS 2 generated by helium ion bombardment. We achieve hyperspectral imaging of specific defect patterns with a detection limit below 0.01% extinction, corresponding to a detectable defect density below 1 × 10 11 cm –2 . The corresponding spectra reveal a broad subgap absorption, being consistent with theoretical predictions related to sulfur vacancy-bound excitons in MoS 2 . Our results highlight cavity-enhanced extinction spectroscopy as efficient means for the detection of optical transitions in nanoscale thin films with weak absorption, applicable to a broad range of materials.
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Research context

OpenAlex topics: 2D Materials and Applications · Thermography and Photoacoustic Techniques · Machine Learning in Materials Science

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Walter Schottky Institute and Physics Department, Technical University of Munich, Am Coulombwall 4a, 85748Garching, Germany

Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, 80799Munich, Germany

Qlibri GmbH, Maistr. 67, 80337Munich, Germany

Faculty of Physics, Ludwig-Maximilians-Universität München, Schellingstraße 4, 80799Munich, Germany

International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba 305-0044, Japan

Research Center for Functional Materials, National Institute for Materials Science, Tsukuba305-0044, Japan

Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1, 76131Karlsruhe, Germany

Funding

Munich Center for Quantum Science and Technology · Deutsche Forschungsgemeinschaft · Japan Society for the Promotion of Science · European Social Fund · H2020 European Research Council · e-conversion?EXC · One Munich Strategy Forum · Munich Quantum Valley K6 · Bundesministerium f?r Wirtschaft und Klimaschutz

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