Dirac-cone-like electronic states on nematic antiferromagnetic FeSe and FeTe

Author:

Zhao L LORCID,Li Y Z,Zhao X MORCID,Dai T A,Li Y R,Meng L J

Abstract

Abstract We investigate the Dirac-cone-like (DCL) topological electronic properties of nematic-like antiferromagnetic (AFM) states of monolayer FeSe and FeTe designed artificially through first-principles calculations and Wannier-function-based tight-binding (WFTB) method. Our calculations reveal most of them have a pair of DCL bands on the Γ–X line in the Brillouin zone (BZ) near the Fermi level and open a gap of about 20 meV in the absence and presence of spin–orbit coupling (SOC), respectively, similar to the lowest-energy pair-checkerboard AFM FeSe. We further confirm that they are weak topological insulators based on nonzero Z 2 and fragile surface states, which are calculated by the WFTB method. For FeSe and FeTe in pair-checkerboard AFM states, we find that the in-plane compression strain in a certain range can give rise to another pair of DCL bands located on the Γ–X′ line in the BZ. In addition, the magnetic moments, energies, and Fe–Se/Te distances for various nematic-like AFM configurations are presented. These calculations the combining effect of magnetism and topology in a single material and the understanding of the superconducting phenomena in iron-based FeSe and FeTe.

Funder

Key Project of Education Department of Hunan Province

Postgraduate Scientific Research Innovation Project of Hunan Province

Hunan Provincial Innovation Foundation for Postgraduate

Natural Science Foundation of Hunan Province

National Natural Science Foundation of China

Publisher

IOP Publishing

Subject

Condensed Matter Physics,General Materials Science

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