Nonclassical Light from Exciton Interactions in a Two-Dimensional Quantum Mirror

• URL: http://arxiv.org/abs/2102.10350v1
• Date: Sat, 20 Feb 2021 14:05:30 GMT
• Title: Nonclassical Light from Exciton Interactions in a Two-Dimensional Quantum Mirror
• Authors: Valentin Walther, Lida Zhang, Susanne F. Yelin, Thomas Pohl
• Abstract summary: Excitons in a semiconductor monolayer form a collective resonance that can reflect resonant light with extraordinarily high efficiency. We show that finite-range interactions between excitons can lead to the generation of highly non-classical light.
• Score: 0.4129225533930965
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Excitons in a semiconductor monolayer form a collective resonance that can reflect resonant light with extraordinarily high efficiency. Here, we investigate the nonlinear optical properties of such atomistically thin mirrors and show that finite-range interactions between excitons can lead to the generation of highly non-classical light. We describe two scenarios, in which optical nonlinearities arise either from direct photon coupling to excitons in excited Rydberg states or from resonant two-photon excitation of Rydberg excitons with finite-range interactions. The latter case yields conditions of electromagnetically induced transparency and thereby provides an efficient mechanism for single-photon switching between high transmission and reflectance of the monolayer, with a tunable dynamical timescale of the emerging photon-photon interactions. Remarkably, it turns out that the resulting high degree of photon correlations remains virtually unaffected by Rydberg-state decoherence, in excess of non-radiative decoherence observed for ground-state excitons in two-dimensional semiconductors. This robustness to imperfections suggests a promising new approach to quantum photonics at the level of individual photons.

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