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|Title:||Synthesis of Co-doped MoS2 monolayers with enhanced valley splitting||Authors:||Zhou, Jiadong
Brehm, John A.
Pantelides, Sokrates T.
|Keywords:||Engineering::Materials||Issue Date:||2020||Source:||Zhou, J., Lin, J., Sims, H., Jiang, C., Cong, C., Brehm, J. A., Zhang, Z., Niu, L., Chen, Y., Zhou, Y., Wang, Y., Liu, F., Zhu, C., Yu, T., Suenaga, K., Mishra, R., Pantelides, S. T., Zhu, Z., Gao, W., ...Zhou, W. (2020). Synthesis of Co-doped MoS2 monolayers with enhanced valley splitting. Advanced Materials, 32(11), e1906536-. https://dx.doi.org/10.1002/adma.201906536||Journal:||Advanced Materials||Abstract:||Internal magnetic moments induced by magnetic dopants in MoS2 monolayers are shown to serve as a new means to engineer valley Zeeman splitting (VZS). Specifically, successful synthesis of monolayer MoS2 doped with the magnetic element Co is reported, and the magnitude of the valley splitting is engineered by manipulating the dopant concentration. Valley splittings of 3.9, 5.2, and 6.15 meV at 7 T in Co-doped MoS2 with Co concentrations of 0.8%, 1.7%, and 2.5%, respectively, are achieved as revealed by polarization-resolved photoluminescence (PL) spectroscopy. Atomic-resolution electron microscopy studies clearly identify the magnetic sites of Co substitution in the MoS2 lattice, forming two distinct types of configurations, namely isolated single dopants and tridopant clusters. Density functional theory (DFT) and model calculations reveal that the observed enhanced VZS arises from an internal magnetic field induced by the tridopant clusters, which couples to the spin, atomic orbital, and valley magnetic moment of carriers from the conduction and valence bands. The present study demonstrates a new method to control the valley pseudospin via magnetic dopants in layered semiconducting materials, paving the way toward magneto-optical and spintronic devices.||URI:||https://hdl.handle.net/10356/147411||ISSN:||1521-4095||DOI:||10.1002/adma.201906536||Rights:||This is the peer reviewed version of the following article: Zhou, J., Lin, J., Sims, H., Jiang, C., Cong, C., Brehm, J. A., Zhang, Z., Niu, L., Chen, Y., Zhou, Y., Wang, Y., Liu, F., Zhu, C., Yu, T., Suenaga, K., Mishra, R., Pantelides, S. T., Zhu, Z., Gao, W., ...Zhou, W. (2020). Synthesis of Co-doped MoS2 monolayers with enhanced valley splitting. Advanced Materials, 32(11), e1906536-. https://dx.doi.org/10.1002/adma.201906536, which has been published in final form at https://doi.org/10.1002/adma.201906536. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
|Appears in Collections:||MSE Journal Articles|
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