声子耦合下Cu $_2$ O激子的电磁感应透明
Electromagnetically induced transparency with Cu$_2$O excitons in the presence of phonon coupling
摘要：
Cu $_2$ O半导体中激子的高激发里德堡态为探索和控制固态环境中的强粒子相互作用提供了一种很有前途的方法。一个主要的障碍是大量的吸收背景，源于激子-声子耦合，位于里德堡激发光谱下，削弱了激子相互作用的影响。在这里，我们证明了在电磁诱导透明（EIT）的条件下，里德伯激子的双光子激发可以用来控制这个背景。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允许将光学里德伯激发与声子诱导的吸收背景分离的条件，甚至完全抑制它。因此，我们的研究结果铺平了道路，利用里德堡封锁与铜$_2$ O激子在非线性光学和其他应用。
英文摘要：
Highly excited Rydberg states of excitons in Cu$_2$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 entirely. Our findings thereby pave the way for the exploitation of Rydberg blockade with Cu$_2$O excitons in nonlinear optics and other applications.
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