All-electrical creation and control of spin-galvanic signal in graphene and molybdenum ditelluride heterostructures at room temperature
Artikel i vetenskaplig tidskrift, 2021

The ability to engineer new states of matter and control their spintronic properties by electric fields is at the heart of future information technology. Here, we report a gate-tunable spin-galvanic effect in van der Waals heterostructures of graphene with a semimetal of molybdenum ditelluride at room temperature due to an efficient spin-charge conversion process. Measurements in different device geometries with control over the spin orientations exhibit spin-switch and Hanle spin precession behavior, confirming the spin origin of the signal. The control experiments with the pristine graphene channels do not show any such signals. We explain the experimental spin-galvanic signals by theoretical calculations considering the spin-orbit induced spin-splitting in the bands of the graphene in the heterostructure. The calculations also reveal an unusual spin texture in graphene heterostructure with an anisotropic out-of-plane and in-plane spin polarization. These findings open opportunities to utilize graphene-based heterostructures for gate-controlled spintronic devices.


Anamul Md Hoque

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Dmitrii Khokhriakov

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Klaus Zollner

Universität Regensburg

Bing Zhao

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Bogdan Karpiak

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

J. Fabian

Universität Regensburg

Saroj Prasad Dash

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Chalmers grafencentrum

Communications Physics

23993650 (eISSN)

Vol. 4 1 124

Graphene Core Project 3 (Graphene Flagship)

Europeiska kommissionen (EU) (EC/H2020/881603), 2020-04-01 -- 2023-03-31.

Spin kommunikation i Dirac Material heterostrukturer

Vetenskapsrådet (VR) (2016-03658), 2017-01-01 -- 2020-12-31.

Inducerade Spin Strukturer i var der Waals Heterostrukturer

Vetenskapsrådet (VR) (2015-06813), 2015-12-01 -- 2017-12-31.


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