Abstract
Monolayer chalcogenide semiconductors with both luminescent and ferromagnetic properties are dreamed for simultaneous polarization and detection of the valley degree of freedom in valleytronics. However, a conventional chalcogenide monolayer lacks these coexisting properties due to their mutually exclusive origins. Herein we demonstrate that robust ferromagnetism and photoluminescence (PL) could be achieved in a (Co, Cr)-incorporated single monolayer MoS2, where the ferromagnetic interaction is activated by Co ions, and the nonradiative recombination channels of excitons is cut off by Cr ions. This strategy brings a 90-fold enhancement of saturation magnetization and 35-fold enhancement of PL intensity than the pristine MoS2 monolayer. The main reasons for the coexisting ferromagnetism and PL are the electronic interactions between the impurity bands of atop Cr adatoms and substitutional Co atoms, as well as the increased content of neutral exciton. Our findings could extend the applications of two-dimensional chalcogenides into spintronics, valleytronic and photoelectric devices.
Highlights
Monolayer chalcogenide semiconductors with both luminescent and ferromagnetic properties are dreamed for simultaneous polarization and detection of the valley degree of freedom in valleytronics
Monolayer transition-metal dichalcogenides (TMDCs) with unit-cell thickness have emerged as a frontier for the exploration of physics and next-generation valleytronic devices, owing to the presence of an additional valley degree of freedom (DOF) that is strongly coupled with spin[1,2,3,4,5,6]
The efficiency of electric control of the valley DOF is severely limited by the interface between the magnetic semiconductor and TMDCs
Summary
Monolayer chalcogenide semiconductors with both luminescent and ferromagnetic properties are dreamed for simultaneous polarization and detection of the valley degree of freedom in valleytronics. In order to fabricate highly integrated valleytronics devices with the long dreamed capability of storing and processing information at the same time, simultaneous polarization and detection of the valley DOF would provide an opportunity Toward this goal, monolayer TMDCs with both robust room-temperature ferromagnetism (FM) and PL will play a critical fundamental role and are highly desired. Attempt to tune the PL intensity has been made by Zhang et al.[19] through doping the magnetic Mn ions in CVD-prepared MoS2 monolayer; the PL is quenched due to the formation of nonradiative recombination Inferred from these results, high PL intensity could only be obtained in TMDCs deficient in magnetic ions and sulphur vacancy. The (Co, Cr)-MoS2 monolayers exhibit a 90-fold
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