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Magnetically correlated defects in a quasi-1D electronic van der Waals magnetic semiconductor

ORAL

Abstract

Defects in two-dimensional magnets are interesting objects to study with prospects for engineering magnetic properties at the atomic scale. The air-stable magnetic semiconductor CrSBr exhibits excellent optical properties providing opportunities to study defect physics in a magnetic environment.

Here, we show optically active defects in CrSBr that are correlated with the magnetic phase diagram. Optical emission properties in multilayer samples are excellent with 1 meV linewidth owing to a quasi-1D electronic structure. We study the defect density and type in scanning probe microscopy and characterize the emission properties in low-temperature photoluminescence (PL) and photoluminescence excitation spectroscopy. In magneto-PL, the defect emission energies are a fingerprint of the magnetic order, but with absolute shifts up to 100 times weaker than the exciton, further highlighting the layer-localized nature of the defect wave function. Moreover, a magnetic phase at low temperature correlates with a strong narrowing of the defect emission, suggesting a change in the spin of the involved bands of the defect transition.

We conclude that CrSBr is an exciting platform for investigating optically active defects that are correlated with the magnetic phase diagram. This opens several novel avenues for tailor-made complex magnetic phases with direct optical access.

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Publication: Klein, J. et al. arXiv: 2207.02884 (2022)<br>Klein, J. et al. arXiv:2205.13456 (2022)

Presenters

  • Julian Klein

    Massachusetts Institute of Technology

Authors

  • Julian Klein

    Massachusetts Institute of Technology

  • Zhigang Song

    Harvard John A. Paulson School Of Engineering And Applied Sc

  • Benjamin Pingault

    Harvard University, Delft University of Technology, Harvard University

  • Florian Dirnberger

    Technical University of Dresden, The City College of New York, City College of New York

  • Hang Chi

    Massachusetts Institute of Technology

  • Jonathan Curtis

    Harvard

  • Rami Dana

    Massachusetts Institute of Technology

  • Rezlind Bushati

    City University of New York, City College of New York

  • Jiamin Quan

    University of Texas at Austin

  • Lukas Dekanovsky

    Department of Inorganic Chemistry, University of Chemistry and Technology Prague

  • Zdenek Sofer

    Department of Inorganic Chemistry, University of Chemistry and Technology Prague

  • Andrea Alu

    The City College of New York

  • Vinod M Menon

    The City College of New York, City College of New York

  • Jagadeesh S Moodera

    Massachusetts Institute of Technology MIT

  • Marko Lon?ar

    Harvard University, Harvard

  • Prineha Narang

    College of Letters and Science, University of California, Los Angeles (UCLA), CA, USA 90095, Harvard

  • Frances M Ross

    Massachusetts Institute of Technology, Massachusetts Institute of Technology MIT