Journal
ADVANCED MATERIALS
Volume 32, Issue 38, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202000818
Keywords
current-induced spin polarization; Edelstein effect; graphene; spin-momentum locking; type-II; unconventional charge-spin conversion; van der Waals heterostructures; Weyl-semimetals; WTe2
Categories
Funding
- EU [604391, 785219, 881603]
- Swedish Research Council VR project [2016-03658]
- EU FlagEra project (from Swedish Research Council VR) [2015-06813]
- 2D Tech VINNOVA competence Center at Chalmers University of Technology
- Graphene center at Chalmers University of Technology
- AoA Nano program at Chalmers University of Technology
- National Basic Research Program of China [2015CB921502]
- National Natural Science Foundation of China [51731003, 51471029]
- program of China Scholarships Council [201706460036]
- Deutsche Forschungsgemeinschaft (DFG) [CRC/TRR 227]
- Swedish Research Council [2015-06813] Funding Source: Swedish Research Council
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An outstanding feature of topological quantum materials is their novel spin topology in the electronic band structures with an expected large charge-to-spin conversion efficiency. Here, a charge-current-induced spin polarization in the type-II Weyl semimetal candidate WTe(2)and efficient spin injection and detection in a graphene channel up to room temperature are reported. Contrary to the conventional spin Hall and Rashba-Edelstein effects, the measurements indicate an unconventional charge-to-spin conversion in WTe2, which is primarily forbidden by the crystal symmetry of the system. Such a large spin polarization can be possible in WTe(2)due to a reduced crystal symmetry combined with its large spin Berry curvature, spin-orbit interaction with a novel spin-texture of the Fermi states. A robust and practical method is demonstrated for electrical creation and detection of such a spin polarization using both charge-to-spin conversion and its inverse phenomenon and utilized it for efficient spin injection and detection in the graphene channel up to room temperature. These findings open opportunities for utilizing topological Weyl materials as nonmagnetic spin sources in all-electrical van der Waals spintronic circuits and for low-power and high-performance nonvolatile spintronic technologies.
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