Giant Edelstein effect in topological-insulator-graphene heterostructures

0484642 - FZÚ 2018 RIV US eng J - Článek v odborném periodiku
Rodriguez-Vega, M. - Schwiete, G. - Sinova, Jairo - Rossi, E.
Giant Edelstein effect in topological-insulator-graphene heterostructures.
Physical Review B. Roč. 96, č. 23 (2017), s. 1-8, č. článku 235419. ISSN 2469-9950. E-ISSN 2469-9969
GRANT EU: European Commission(XE) 610115 - SC2
Institucionální podpora: RVO:68378271
Klíčová slova: double-layer graphene * spin-orbit torque * dirac fermions * electronic-properties
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.813, rok: 2017

The control of a ferromagnet's magnetization via only electric currents requires the efficient generation of current-driven spin torques. In magnetic structures based on topological insulators (TIs) current-induced spin-orbit torques can be generated. Here we show that the addition of graphene, or bilayer graphene, to a TI-based magnetic structure greatly enhances the current-induced spin-density accumulation and significantly reduces the amount of power dissipated. We find that this enhancement can be as high as a factor of 100, giving rise to a giant Edelstein effect. Such a large enhancement is due to the high mobility of graphene (bilayer graphene) and to the fact that the graphene (bilayer graphene) sheet very effectively screens charge impurities, the dominant source of disorder in topological insulators. Our results show that the integration of graphene in spintronics devices can greatly enhance their performance and functionalities.
Trvalý link: http://hdl.handle.net/11104/0279798