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Thomas Pohl

Controlling Exciton-Phonon Interactions via Electromagnetically Induced Transparency

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  • V. Walther, Harvard University
  • ,
  • P. Grünwald
  • ,
  • T. Pohl

Highly excited Rydberg states of excitons in Cu2O semiconductors provide a promising approach to explore and control strong particle interactions in a solid-state environment. A major obstacle has been the substantial absorption background that stems from exciton-phonon coupling and lies under the Rydberg excitation spectrum, weakening the effects of exciton interactions. Here, we demonstrate that two-photon excitation of Rydberg excitons under conditions of electromagnetically induced transparency (EIT) can be used to control this background. Based on a microscopic theory that describes the known single-photon absorption spectrum, we analyze the conditions under which two-photon EIT permits separating the optical Rydberg excitation from the phonon-induced absorption background, and even suppressing it entir7ely. Our findings thereby pave the way for the exploitation of Rydberg blockade with Cu2O excitons in nonlinear optics and other applications.

Original languageEnglish
Article number173601
JournalPhysical Review Letters
Publication statusPublished - Oct 2020

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