Probing Coherent Spin Dynamics of Isolated Exchange Coupled Defects in III-V Semiconductors

ORAL

Abstract

Individual magnetic impurities or small collections of magnetic impurities in III-V semiconductors can be identified via scanning tunneling microscopy (STM) [1,2]. Their exchange interaction can be measured [3], and they can have remarkably long spin coherence times [4]. Through low-field magnetoresistance calculations we find that exchange coupled defects generate a resonance feature in the current at critical values of the applied magnetic field, termed "exchange resistance". Using a single site approximation [5,6], the signatures of hyperfine interaction and the influence of g-factor fluctuation on exchange resistance are examined. By including a non-trivial spin manifold as the ground state this work becomes applicable to defects like divacancies in silicon carbide and Mn+hole complexes in gallium arsenide.

[1] J. M. Tang and M. E. Flatté, Phys. Rev. Lett. 92, 047201 (2004).
[2] A. M. Yakunin et al., Phys. Rev. Lett. 92, 216806 (2004).
[3] D. Kitchen et al., Nature 442, 436 (2006).
[4] R. C. Myers et al., Nature Materials 7, 203 (2008).
[5] H. Inoue et al., Phys. Rev. X 5, 041023 (2015)
[6] N. J. Harmon and M. E. Flatté, Phys. Rev. B 98, 035412 (2018)

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Presenters

  • Stephen McMillan

    Optical Science and Technology Center and Department of Physics and Astronomy, University of Iowa, University of Iowa

Authors

  • Stephen McMillan

    Optical Science and Technology Center and Department of Physics and Astronomy, University of Iowa, University of Iowa

  • Nicholas Harmon

    Optical Science and Technology Center and Department of Physics and Astronomy, University of Iowa, University of Iowa, Physics and Astronomy, University of Iowa

  • Michael Flatté

    Optical Science and Technology Center and Department of Physics and Astronomy, University of Iowa, Department of Physics and Astronomy and Optical Science and Technology Center, University of Iowa, Physics and Astronomy, University of Iowa, Iowa City, University of Iowa, Department of Physics and Astronomy, University of Iowa, Physics and Astronomy, University of Iowa