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Title: Electric and geometric controlling of the magnetic coupling in Kane-Mele nanoribbons

Abstract

In this paper, we show that indirect spin interaction J between two magnetic impurities located on honeycomb Kane-Mele zigzag/armchair ribbons (KMZR/KMAR) is easily controlled by staggered potential and geometry. We demonstrate that J in periodic-boundary KMZR reaches maximum at the edges, and oscillates between antiferromagnetic and ferromagnetic couplings when tuning the sublattice staggered potential Δ. The odd-even length effect of J in KMZR and the width dependence of J in KMAR are also presented. These results clearly demonstrate the unique role of topological edge states and finite-size effect in magnetic coupling of quantum spin Hall (QSH) ribbons, and the controllability of the edge magnetism, hence favoring the fabrication of the spintronic devices in two-dimensional buckled honeycomb materials, e.g., silicene and germanene.

Authors:
 [1];  [1];  [2];  [3]
  1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, P.O. Box 1129, Hefei 230031 (China)
  2. (China)
  3. Beijing Computational Science Research Center, Beijing 100084 (China)
Publication Date:
OSTI Identifier:
22410109
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; FABRICATION; FERROMAGNETISM; GERMANENE; MAGNETIC MATERIALS; NANOSTRUCTURES; POTENTIALS; SILICENE; SPIN; TWO-DIMENSIONAL SYSTEMS

Citation Formats

Bao, Weicheng, Zou, Liang-Jian, E-mail: zou@theory.issp.ac.cn, Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, and Lin, H.-Q. Electric and geometric controlling of the magnetic coupling in Kane-Mele nanoribbons. United States: N. p., 2015. Web. doi:10.1063/1.4907619.
Bao, Weicheng, Zou, Liang-Jian, E-mail: zou@theory.issp.ac.cn, Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, & Lin, H.-Q. Electric and geometric controlling of the magnetic coupling in Kane-Mele nanoribbons. United States. doi:10.1063/1.4907619.
Bao, Weicheng, Zou, Liang-Jian, E-mail: zou@theory.issp.ac.cn, Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, and Lin, H.-Q. Thu . "Electric and geometric controlling of the magnetic coupling in Kane-Mele nanoribbons". United States. doi:10.1063/1.4907619.
@article{osti_22410109,
title = {Electric and geometric controlling of the magnetic coupling in Kane-Mele nanoribbons},
author = {Bao, Weicheng and Zou, Liang-Jian, E-mail: zou@theory.issp.ac.cn and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026 and Lin, H.-Q.},
abstractNote = {In this paper, we show that indirect spin interaction J between two magnetic impurities located on honeycomb Kane-Mele zigzag/armchair ribbons (KMZR/KMAR) is easily controlled by staggered potential and geometry. We demonstrate that J in periodic-boundary KMZR reaches maximum at the edges, and oscillates between antiferromagnetic and ferromagnetic couplings when tuning the sublattice staggered potential Δ. The odd-even length effect of J in KMZR and the width dependence of J in KMAR are also presented. These results clearly demonstrate the unique role of topological edge states and finite-size effect in magnetic coupling of quantum spin Hall (QSH) ribbons, and the controllability of the edge magnetism, hence favoring the fabrication of the spintronic devices in two-dimensional buckled honeycomb materials, e.g., silicene and germanene.},
doi = {10.1063/1.4907619},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 117,
place = {United States},
year = {2015},
month = {5}
}