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Interaction of charged impurities and Rydberg excitons in cuprous oxide

Sjard Ole Krüger, Heinrich Stolz, and Stefan Scheel
Phys. Rev. B 101, 235204 – Published 16 June 2020
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  • INTRODUCTION
  • THEORY OF STARK-SHIFTED EXCITONS
  • NUMERICAL RESULTS AND COMPARISON TO…
  • DISCUSSION AND OUTLOOK
  • ACKNOWLEDGMENTS
    • References

    Abstract

    We investigate the influence of a static, uncorrelated distribution of charged impurities on the spectrum of bound excitons in the copper oxide Cu2O. We show that the statistical distribution of Stark shifts and ionization rates leads to the vanishing of Rydberg resonances into an apparent continuum. The appearance of additional absorption lines due to the broken rotational symmetry, together with spatially inhomogeneous Stark shifts, leads to a modification of the observed line shapes that agrees qualitatively with the changes observed in the experiment.

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    • Received 19 March 2020
    • Revised 11 May 2020
    • Accepted 3 June 2020

    DOI:https://doi.org/10.1103/PhysRevB.101.235204

    ©2020 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    ExcitonsPlasma-particle interactionsStark effect
    Condensed Matter, Materials & Applied Physics

    Authors & Affiliations

    Sjard Ole Krüger*, Heinrich Stolz, and Stefan Scheel

    • Institut für Physik, Universität Rostock, Albert-Einstein-Straße 23-24, D-18059 Rostock, Germany

    • *sjard.krueger@uni-rostock.de

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    Vol. 101, Iss. 23 — 15 June 2020

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    • Figure 1
      Figure 1

      Comparison of the linewidths derived from spectrum S1 with the theoretically expected scaling (see Sec. 3 for details about the experimental spectra). The deviation can be explained by an additional broadening of 5.55 μeV for all lines.

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    • Figure 2
      Figure 2

      Comparison of experimental spectra (dashed red lines) and numerical spectra (solid blue lines). (a) Comparison of spectrum S1 to the numerical spectrum for ρci=1.2×109cm−3. (b) S2 vs numerical spectrum for ρci=1011cm−3. The vertical lines represent the (numerical) positions of the unperturbed P excitons.

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    • Figure 3
      Figure 3

      The line parameters of Eq. (9) derived by fits to the numerical and experimental spectra for different impurity densities: (a) the oscillator strength, (b) the FWHM linewidths, and (c) the asymmetry parameter. The error bars denote one standard deviation.

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    • Figure 4
      Figure 4

      The band-gap shift ΔEg(ρci) (red diamonds) with a power-law fit (dashed line) and the maximum observable principal quantum number nmax(ρci) (blue triangles).

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