Journal
NANO LETTERS
Volume 19, Issue 10, Pages 7301-7308Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b02920
Keywords
2D materials; quantum emitter; van der Waals ferromagnet; magnetic proximity effect; g factor; magnetic exchange field
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Funding
- National Science Foundation (NSF) [DMR-1809235, ECCS-MRI-1531237]
- NSF grant EFRI 2 -DARE [EFRI-1542707]
- DOE SCGSR award
- U.S. Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists, Office of Science Graduate Student Research (SCGSR) program
- ORAU [DE-SC0014664]
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The realization of on-chip quantum networks requires tunable quantum states to encode information carriers on them. We show that Cr2Ge2Te6 (CGT) as a van der Waals ferromagnet can enable magnetic proximity coupling to site-controlled quantum emitters in WSe2, giving rise to ultrahigh exciton g 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/WSe2 heterostructure. Our work extends the on-chip control of magneto-optical properties of excitons via van der Waals heterostructures to solid-state quantum emitters.
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