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Issue 47, 2019
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Tuning valley polarization in two-dimensional ferromagnetic heterostructures

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Abstract

Two-dimensional (2D) heterostructures can generate new properties that are not possessed in their constituents. Monolayer transition metal dichalcogenides (TMDs) MX2 (M = Mo, W; X = Se, Te) are an ideal system to produce the valley degree of freedom, furthermore, the magnetic proximity effect in MX2/Cr2Ge2Te6 heterostructures can lift the valley degeneracy and produce nonvolatile valley polarization (VP). Taking the WSe2/Cr2Ge2Te6 heterostructure as an example, we demonstrate that the normal strain can modify the magnetic proximity effect and tune the VP. In addition, comparing the different MX2/Cr2Ge2Te6 heterostructures, we find that the VP not only relies on the transition metal atom M, but also depends on the super–super exchange “–X–Te–” which connects the M atom and the magnetic Cr atom. The induced VP in MX2 follows the sequence: WTe2 > WSe2 > MoTe2 > MoSe2. Our investigation reveals the tunability of VP in MX2/Cr2Ge2Te6 heterostructures, which will be of great significance in valleytronics.

Graphical abstract: Tuning valley polarization in two-dimensional ferromagnetic heterostructures

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Publication details

The article was received on 14 Aug 2019, accepted on 25 Oct 2019 and first published on 15 Nov 2019


Article type: Paper
DOI: 10.1039/C9TC04511B
J. Mater. Chem. C, 2019,7, 14932-14937

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    Tuning valley polarization in two-dimensional ferromagnetic heterostructures

    Y. Sun, L. Shang, W. Ju, Y. An, S. Gong and J. Wang, J. Mater. Chem. C, 2019, 7, 14932
    DOI: 10.1039/C9TC04511B

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