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arXiv · 1302.2996

Antifferomagnetic FeSe monolayer on SiTiO$_{3}$: The charge doping and electric field effects

Fawei Zheng·Zhigang Wang·Wei Kang·Ping Zhang
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Abstract

We present theoretically the electronic structure of antiferromagnetic (AFM) FeSe monolayer on TiO$_{2}$ terminated SrTiO$_{3}$(001) surface. It is revealed that the striking disappearance of the Fermi surface around the Brillouin zone (BZ) center can be well explained by the antiferromatnetic (AFM) phase. We show that the system has a considerable charge transfer from SrTiO$_{3}$(001) substrate to FeSe monolayer, and so has a self-constructed electric field. The FeSe monolayer band structure near the BZ center is sensitive to charge doping, and the spin-resolved energy bands at BZ corner are distorted to be flattened by the perpendicular electric field. We propose a tight-binding model Hamiltonian to take these key factors into account. We also show that this composite structure is an ideal electron-hole bilayer system, with electrons and holes respectively formed in FeSe monolayer and TiO$_{2}$ surface layer.

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Fawei Zheng, Zhigang Wang, Wei Kang, Ping Zhang. 2013-02-13. Antifferomagnetic FeSe monolayer on SiTiO$_{3}$: The charge doping and electric field effects. https://arxiv.org/abs/1302.2996

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