Naslov
Spin gating with van der Waals heterostructures

Autori
Bosnar, Mihovil ; Lončarić Ivor ; Lazić Predrag

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
19th International Workshop on Computational Physics and Material Science: Total Energy and Force Methods : Book of Abstracts / Hassanali, A. - Trst, 2019, 36-36

Skup
19th International Workshop on Computational Physics and Material Science

Mjesto i datum
Trst, Italija, 09.01.2019. - 11.01.2019

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
surfaces ; magnetism ; graphene ; proximity effect

Sažetak
Effective spin gating with van der Waals heterostructures We consider a possibility of devising an efficient spin current gate based on ferromagnetic metal slab - graphene interface [1]. Such a device should significantly change the spin polarization of the current passing through it when a small external electric field is applied to it. Graphene is chosen for this application because of its small density of states (DOS) around the Fermi level, which should cause large shifts in the Fermi level, and thus the conductivity of the structure, when the field is applied, while it consisting of only one layer would mean that the magnetic proximity effect should make the response weakly but significantly magnetic, in contrast to any nonmagnetic 3D structures added to ferromagnetic slab. We show that laying graphene directly on cobalt surface results in chemical binding, which destroys the electron structure of graphene and leaves graphene DOS insensitive to the applied field [1]. As a solution to this problem a single layer of hexagonal boron nitride is inserted between graphene and cobalt so that it binds chemically to the slab, and then graphene binds to it by van der Waals forces, which largely preserves the electronic structure. The desired response is obtained in such a structure, although it is too weak because of strong doping of graphene when the chemical potential in structure is equilibrated [1]. To remove this unwanted doping, we explore a possibility of adding an additional platinum layer, platinum being known to absorb the electrons from graphene in pure platinum-graphene interface [2]. [1] P. Lazić, K. D. Belaschenko, I. Žutić, Phys. Rev. B 93, 241401 (2014) [2] P. A. Khomyakov et al., Phys. Rev. B 79, 195425 (2009)

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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