Rydberg Excitons in the Presence of an Ultralow-Density Electron-Hole Plasma

Physical Review Letters
J HeckötterS Scheel

Abstract

We study the Rydberg exciton absorption of Cu_{2}O in the presence of free carriers injected by above-band-gap illumination. Already at plasma densities ρ_{EH} below one hundredth electron-hole pair per μm^{3}, exciton lines are bleached, starting from the highest observed principal quantum number, while their energies remain constant. Simultaneously, the band gap decreases by correlation effects with the plasma. An exciton line loses oscillator strength when the band gap approaches its energy, vanishing completely at the crossing point. Adapting a plasma-physics description, we describe the observations by an effective Bohr radius that increases with rising plasma density, reflecting the Coulomb interaction screening by the plasma.

References

Nov 1, 1995·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·J SeidelW D Kraeft
Oct 6, 1986·Physical Review Letters·S JohnE N Economou
Jul 20, 2001·Physical Review Letters·M D LukinP Zoller
Oct 17, 2014·Nature·T KazimierczukM Bayer
Oct 8, 2016·Physical Review Letters·P GrünwaldS Scheel

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Citations

Sep 12, 2020·Physical Review Letters·Valentin Walther, Thomas Pohl
Sep 26, 2020·Physical Review Letters·Edoardo BaldiniMajed Chergui
Jul 22, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Heinrich Stolz, Dirk Semkat
Aug 25, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·D SemkatH Fehske

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