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