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Optical Injection and Detection of Long-Lived Interlayer Excitons in van der Waals Heterostructures
Alperen Tüğen1, Anna M Seiler1, Arthur Christianen1
1ETH Zurich, Institute for Quantum Electronics, CH-8093 Zurich, Switzerland.
Abstract:
Interlayer excitons in semiconducting bilayers separated by insulating hexagonal boron nitride (h-BN) layers constitute a promising platform for investigation of strongly correlated bosonic phases. Here, we report an optical method for the generation and characterization of long-lived interlayer excitons. We confirm the presence of tightly bound interlayer excitons by measuring 1s and 2s intralayer excitons in each layer concurrently. Using a pump-probe technique, we find interlayer exciton lifetimes up to 8.8 μs, increasing with the thickness of the h-BN. With optical access to long-lived interlayer excitons, our approach provides a new route to explore degenerate Bose-Fermi mixtures of excitons and itinerant electrons with high spatial and temporal resolution.
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