期刊
NEW JOURNAL OF PHYSICS
卷 15, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/15/6/063031
关键词
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资金
- WPI Initiative on Materials Nanoarchitectonics
- MEXT of Japan
- JSPS, Innovative Area 'Topological Quantum Phenomena' [22540377, 25400385]
- MEXT of Japan [25103723]
- CREST, JST
- NSFC [10904092]
- Grants-in-Aid for Scientific Research [25103723] Funding Source: KAKEN
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.
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