Gate-tunable spin-galvanic effect in graphene-topological insulator van der Waals heterostructures at room temperature
Artikel i vetenskaplig tidskrift, 2020

Unique electronic spin textures in topological states of matter are promising for emerging spin-orbit driven memory and logic technologies. However, there are several challenges related to the enhancement of their performance, electrical gate-tunability, interference from trivial bulk states, and heterostructure interfaces. We address these challenges by integrating two-dimensional graphene with a three-dimensional topological insulator (TI) in van der Waals heterostructures to take advantage of their remarkable spintronic properties and engineer proximity-induced spin-charge conversion phenomena. In these heterostructures, we experimentally demonstrate a gate-tunable spin-galvanic effect (SGE) at room temperature, allowing for efficient conversion of a non-equilibrium spin polarization into a transverse charge current. Systematic measurements of SGE in various device geometries via a spin switch, spin precession, and magnetization rotation experiments establish the robustness of spin-charge conversion in the Gr-TI heterostructures. Importantly, using a gate voltage, we reveal a strong electric field tunability of both amplitude and sign of the spin-galvanic signal. These findings provide an efficient route for realizing all-electrical and gate-tunable spin-orbit technology using TIs and graphene in heterostructures, which can enhance the performance and reduce power dissipation in spintronic circuits.


three-dimensional modeling


electric field

temperature effect



Dmitrii Khokhriakov


Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Anamul Md Hoque

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik


Bogdan Karpiak


Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Saroj Prasad Dash

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik


Nature Communications

2041-1723 (ISSN) 20411723 (eISSN)

Vol. 11 1 3657

Inducerade Spin Strukturer i var der Waals Heterostrukturer

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

Spin kommunikation i Dirac Material heterostrukturer

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

Graphene Core Project 1. Graphene-based disruptive technologies (Graphene Flagship)

Europeiska kommissionen (EU) (EC/H2020/696656), 2016-04-01 -- 2018-03-31.

Graphene Core Project 2 (Graphene Flagship)

Europeiska kommissionen (EU) (EC/H2020/785219), 2018-04-01 -- 2020-03-31.

Graphene Core Project 3 (Graphene Flagship)

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


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