Highly excited Rydberg states of excitons in ${\mathrm{Cu}}_2\mathrm{O}$ 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 ${\mathrm{Cu}}_2\mathrm{O}$ excitons in nonlinear optics and other applications.

中文翻译：

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通过电磁感应的透明度控制激子-声子相互作用

里德堡激子的高度兴奋态 ${铜}_2\mathrm{Ø}$半导体提供了一种在固态环境中探索和控制强粒子相互作用的有前途的方法。一个主要的障碍是激子-声子耦合产生的大量吸收背景，它位于里德堡激发光谱之下，削弱了激子相互作用的影响。在这里，我们证明了在电磁感应的透明性（EIT）的条件下里德堡激子的双光子激发可以用来控制这一背景。基于描述已知单光子吸收光谱的微观理论，我们分析了双光子EIT允许将光学Rydberg激发与声子诱导的吸收本底分离，甚至完全抑制它的条件。因此，我们的发现为利用Rydberg封锁${铜}_2\mathrm{Ø}$ 激子在非线性光学和其他应用中。