Antiferromagnetic proximity coupling between semiconductor quantum emitters in WSe2 and van der Waals ferromagnets

Na Liu; Cosmo M Gallaro; Kamran Shayan; Arunabh Mukherjee; Bumho Kim; James Hone; Nick Vamivakas; Stefan Strauf

doi:10.1039/d0nr06632j

Antiferromagnetic proximity coupling between semiconductor quantum emitters in WSe₂ and van der Waals ferromagnets

Nanoscale. 2021 Jan 21;13(2):832-841. doi: 10.1039/d0nr06632j.

Authors

Na Liu¹, Cosmo M Gallaro¹, Kamran Shayan², Arunabh Mukherjee², Bumho Kim³, James Hone³, Nick Vamivakas⁴, Stefan Strauf¹

Affiliations

¹ Department of Physics, Stevens Institute of Technology, Hoboken, New Jersey 07030, USA. sstrauf@stevens.edu and Center for Quantum Science and Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030, USA.
² The Institute of Optics, University of Rochester, Rochester, New York 14627, USA and Center for Coherence and Quantum Optics, University of Rochester, Rochester, New York 14627, USA.
³ Department of Mechanical Engineering, Columbia University, New York 10027, USA.
⁴ The Institute of Optics, University of Rochester, Rochester, New York 14627, USA and Center for Coherence and Quantum Optics, University of Rochester, Rochester, New York 14627, USA and Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.

PMID: 33351877
DOI: 10.1039/d0nr06632j

Abstract

van der Waals ferromagnets have gained significant interest due to their unique ability to provide magnetic response even at the level of a few monolayers. Particularly in combination with 2D semiconductors, such as the transition metal dichalcogenide WSe2, one can create heterostructures that feature unique magneto-optical response in the exciton emission through the magnetic proximity effect. Here we use 0D quantum emitters in WSe2 to probe for the ferromagnetic response in heterostructures with Fe3GT and Fe5GT ferromagnets through an all-optical read-out technique that does not require electrodes. The spectrally narrow spin-doublet of the WSe2 quantum emitters allowed to fully resolve the hysteretic magneto-response in the exciton emission, revealing the characteristic signature of both ferro- and antiferromagnetic proximity coupling that originates from the interplay among Fe3GT or Fe5GT, a thin surface oxide, and the spin doublets of the quantum emitters. Our work highlights the utility of 0D quantum emitters for probing interface magnetic dipoles in vdW heterostructures with high precision. The observed hysteretic magneto response in the exciton emission of quantum emitters adds further new degrees of freedom for spin and g-factor manipulation of quantum states.