Kavli Affiliate: Herre S. J. Van Der Zant
| First 5 Authors: , , , ,
| Summary:
Van der Waals heterostructures (vdWHs) composed of transition-metal
dichalcogenides (TMDs) and layered magnetic semiconductors offer great
opportunities to manipulate exciton and valley properties of TMDs. Here, we
present magneto-photoluminescence (PL) studies in a WSe2 monolayer (ML) on a
CrSBr crystal, an anisotropic layered antiferromagnetic semiconductor. Our
results reveal unique behavior of each of the ML-WSe2 PL peaks under magnetic
field that is distinct from the pristine case. An intriguing feature is the
clear enhancement of the PL intensity that we observe each time the external
magnetic field tunes the energy of an exciton in CrSBr into resonance with one
of the optical states of WSe2. This result suggests a magnetic field-controlled
resonant energy transfer (RET) beyond other effects reported in similar
structures. Our work provides deep insight on the importance of different
mechanisms into magnetic vdWHs and underscores its great potential for light
harvesting and emission enhancement of two-dimensional materials.
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