Magnetic Proximity Coupling of Quantum Emitters in WSe<sub>2</sub> to van der Waals Ferromagnets.
basic_science · Level V
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- Record sourced from PubMed, PMID 31550164.
- Also identified by DOI 10.1021/acs.nanolett.9b02920.
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Abstract
The realization of on-chip quantum networks requires tunable quantum states to encode information carriers on them. We show that Cr<sub>2</sub>Ge<sub>2</sub>Te<sub>6</sub> (CGT) as a van der Waals ferromagnet can enable magnetic proximity coupling to site-controlled quantum emitters in WSe<sub>2</sub>, giving rise to ultrahigh exciton <i>g</i> factors up to 20 ± 1. By comparing the same site-controlled quantum emitter before and after ferromagnetic proximity coupling, we also demonstrate a technique to directly measure the resulting magnetic exchange field (MEF) strength. Experimentally determined values of MEF up to 1.2 ± 0.2 meV in the saturation regime approach the theoretical limit of 2.1 meV that was determined from density functional theory calculations of the CGT/WSe<sub>2</sub> heterostructure. Our work extends the on-chip control of magneto-optical properties of excitons via van der Waals heterostructures to solid-state quantum emitters.