PhD Mid-term Seminar Series: Large multi-directional spin-to-charge conversion in low symmetry semimetal MoTe2 at room temperature

CIC nanoGUNE Seminars

Speaker: Nerea Ontoso, Nanodevices Group
When: 2019/09/23
13:00
Place: nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
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PhD Mid-term Seminar Series: Large multi-directional spin-to-charge conversion in low symmetry semimetal MoTe2 at room temperature

Efficient and versatile spin-to-charge current conversion is crucial for the development of spintronic applications, which strongly rely on the ability to electrically generate and detect spin currents. While the high crystal symmetry in heavy metals limits the conversion to the orthogonal configuration, unusual configurations are expected in low symmetry transition metal dichalcogenide semimetals, which could add flexibility to the electrical injection and detection of pure spin currents. Here, we report the observation of spin-to-charge conversion in MoTe2 flakes, which are stacked in graphene lateral spin valves. We detect two distinct contributions arising from the conversion of two different spin orientations. In addition to the conventional conversion where the spin polarization is orthogonal to the charge current, we also detect a conversion where the spin polarization and the charge current are parallel. Both contributions, which could arise either from bulk spin Hall effect or surface Edelstein effect, show large efficiencies comparable to the best spin Hall metals and topological insulators. Our finding enables the simultaneous conversion of spin currents with any in-plane spin polarization in one single experimental configuration.