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

polarization

magnetization

three-dimensional modeling

temperature effect

electric field

Författare

Dmitrii Khokhriakov

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Anamul Md Hoque

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Bogdan Karpiak

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Saroj Prasad Dash

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Nature Communications

2041-1723 (ISSN)

Vol. 11 1 3657

Graphene Core Project 3 (Graphene Flagship)

Europeiska kommissionen (Horisont 2020), 2020-04-01 -- 2023-03-31.

Inducerade Spin Strukturer i var der Waals Heterostrukturer

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

Spin kommunikation i Dirac Material heterostrukturer

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

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

Europeiska kommissionen (Horisont 2020), 2016-04-01 -- 2018-03-31.

Graphene Core Project 2 (Graphene Flagship)

Europeiska kommissionen (Horisont 2020), 2018-04-01 -- 2020-03-31.

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

2020-08-14