Magnetoelectric control of topological phases in graphene

Takenaka, Hiroyuki; Sandhoefner, Shane; Kovalev, Alexey A.; Tsymbal, Evgeny Y.

doi:10.1103/PhysRevB.100.125156

Title: Magnetoelectric control of topological phases in graphene

Journal Article · Wed Sep 25 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.100.125156· OSTI ID:1596694

Takenaka, Hiroyuki ^[1]; Sandhoefner, Shane ^[1]; Kovalev, Alexey A. ^[1];

^[1]

Univ. of Nebraska, Lincoln, NE (United States)

Topological antiferromagnetic (AFM) spintronics is an emerging field of research, which involves the topological electronic states coupled to the AFM order parameter known as the Néel vector. The control of these states is envisioned through manipulation of the Néel vector by spin-orbit torques driven by electric currents. In this work, we present a different approach favorable for low-power AFM spintronics, where the control of the topological states in a two-dimensional material, such as graphene, is performed via the proximity effect by the voltage induced switching of the Néel vector in an adjacent magnetoelectric AFM insulator, such as chromia. Mediated by the symmetry protected boundary magnetization and the induced Rashba-type spin-orbit coupling at the interface between graphene and chromia, the emergent topological phases in graphene can be controlled by the Néel vector. Using density functional theory and tight-binding Hamiltonian approaches, we model a $graphene / {Cr}_{2} O_{3}$ (0001) interface and demonstrate nontrivial band gap openings in the graphene Dirac bands asymmetric between the $K$ and $K^{'}$ valleys. This gives rise to an unconventional quantum anomalous Hall effect (QAHE) with a quantized value of $2 e^{2} / h$ and an additional steplike feature at a value close to $e^{2} / 2 h$ , and the emergence of the spin-polarized valley Hall effect (VHE). Additionally, depending on the Néel vector orientation, we predict the appearance and transformation of different topological phases in graphene across the 180° AFM domain wall, involving the QAHE, the valley-polarized QAHE, and the quantum VHE, and the emergence of the chiral edge states along the domain wall. These topological properties are controlled by voltage through magnetoelectric switching of the AFM insulator with no need for spin-orbit torques.

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Research Organization:: Univ. of Nebraska, Lincoln, NE (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF)

Grant/Contract Number:: SC0014189; ECCS-1740136

OSTI ID:: 1596694

Journal Information:: Physical Review B, Vol. 100, Issue 12; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Title: Magnetoelectric control of topological phases in graphene

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