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.

topology

three-dimensional modeling

polarization

electric field

temperature effect

magnetization

Författare

Dmitrii Khokhriakov

2D-Tech

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Anamul Md Hoque

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

2D-Tech

Bogdan Karpiak

2D-Tech

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Saroj Prasad Dash

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

2D-Tech

Nature Communications

2041-1723 (ISSN)

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.

Ämneskategorier

Annan fysik

Nanoteknik

Annan elektroteknik och elektronik

Den kondenserade materiens fysik

Infrastruktur

Nanotekniklaboratoriet

DOI

10.1038/s41467-020-17481-1

Mer information

Senast uppdaterat

2022-02-25