Magnetoelectric control of topological phases in graphene
Abstract
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 spinorbit torques driven by electric currents. In this work, we present a different approach favorable for lowpower AFM spintronics, where the control of the topological states in a twodimensional 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 Rashbatype spinorbit 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 tightbinding Hamiltonian approaches, we model a $\mathrm{graphene}/{\mathrm{Cr}}_{2}{\mathrm{O}}_{3}$ (0001) interface and demonstrate nontrivial band gap openings in the graphene Dirac bands asymmetric between the $K$ and ${K}^{\text{'}}$ 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 ${e}^{2}/2h$, and the emergence of the spinpolarized 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 valleypolarized 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 spinorbit torques.
 Authors:

 Univ. of Nebraska, Lincoln, NE (United States)
 Publication Date:
 Research Org.:
 Univ. of Nebraska, Lincoln, NE (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC22). Materials Sciences & Engineering Division; National Science Foundation (NSF)
 OSTI Identifier:
 1596694
 Grant/Contract Number:
 SC0014189; ECCS1740136
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physical Review B
 Additional Journal Information:
 Journal Volume: 100; Journal Issue: 12; Journal ID: ISSN 24699950
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Anomalous Hall effect; Antiferromagnetism; Electronic structure; Exchange interaction; Firstprinciples calculations; Quantum anomalous Hall effect; Rashba coupling; Spin polarization; Spintronics; Valleytronics; Physical Systems; Graphene
Citation Formats
Takenaka, Hiroyuki, Sandhoefner, Shane, Kovalev, Alexey A., and Tsymbal, Evgeny Y. Magnetoelectric control of topological phases in graphene. United States: N. p., 2019.
Web. doi:10.1103/PhysRevB.100.125156.
Takenaka, Hiroyuki, Sandhoefner, Shane, Kovalev, Alexey A., & Tsymbal, Evgeny Y. Magnetoelectric control of topological phases in graphene. United States. https://doi.org/10.1103/PhysRevB.100.125156
Takenaka, Hiroyuki, Sandhoefner, Shane, Kovalev, Alexey A., and Tsymbal, Evgeny Y. Wed .
"Magnetoelectric control of topological phases in graphene". United States. https://doi.org/10.1103/PhysRevB.100.125156. https://www.osti.gov/servlets/purl/1596694.
@article{osti_1596694,
title = {Magnetoelectric control of topological phases in graphene},
author = {Takenaka, Hiroyuki and Sandhoefner, Shane and Kovalev, Alexey A. and Tsymbal, Evgeny Y.},
abstractNote = {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 spinorbit torques driven by electric currents. In this work, we present a different approach favorable for lowpower AFM spintronics, where the control of the topological states in a twodimensional 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 Rashbatype spinorbit 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 tightbinding Hamiltonian approaches, we model a graphene/Cr2O3 (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 2e2/h and an additional steplike feature at a value close to e2/2h, and the emergence of the spinpolarized 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 valleypolarized 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 spinorbit torques.},
doi = {10.1103/PhysRevB.100.125156},
journal = {Physical Review B},
number = 12,
volume = 100,
place = {United States},
year = {2019},
month = {9}
}
Web of Science
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