Neutralization of impurities by continuous-wave excitation of high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>n</mml:mi></mml:math> Rydberg excitons

Abstract

Rydberg excitons are electron-hole pairs excited to high principle quantum numbers ($n$), that can be addressed in the semiconductor Cu${}_{2}$O. Embedded in a crystalline environment, the highest Rydberg states typically suffer from the presence electric stray fields induced by charged impurities. Here, the authors show a technique to neutralize these impurities by the excitation of Rydberg excitons. The result is an overall improvement of the absorption spectrum's quality in terms of increased oscillator strengths and narrower linewidths, approaching the Fourier limit.

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