Work

Electrically tunable topological state in [111] perovskite materials with an antiferromagnetic exchange field

Year: 2013

Type: article

Abstract: We propose a scheme of band engineering by means of staggered electric potential, antiferromagnetic exchange field and intrinsic spin–orbit coupling for electrons on a honeycomb lattice. With fine control on the degrees of freedom of spin, sublattice and valley, one can achieve a topological state with simultaneous non-zero charge and spin Chern numbers. With first principles calculations, we confirm that the scheme can be realized by material modification in perovskite G-type antiferromagnetic insulators grown along the [111] direction, where Dirac electrons from d orbits are achieved on an atomic sheet of a buckled honeycomb lattice. In a finite sample, this state provides a spin-polarized quantum edge current, robust to both non-magnetic and magnetic defects, with the spin polarization reversible by electric field, and is thus ideal for spintronics applications.

Source: New Journal of Physics

DOI: 10.1088/1367-2630/15/6/063031

Authors: Qi-Feng Liang, Long-Hua Wu, Xiao Hu

Institutions: Shaoxing University, National Institute for Materials Science, Research Center for Materials Nanoarchitectonics

Language: English

Topic: Topological Materials and Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,610

Funders: Ministry of Education, Culture, Sports, Science and Technology, National Natural Science Foundation of China, Japan Society for the Promotion of Science, Core Research for Evolutional Science and Technology