We present theoretically the electronic structure of antiferromagnetic (AFM) FeSe monolayer on TiO2 terminated SrTiO3(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 SrTiO3(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 TiO2 surface layer.
@article{arxiv.1302.2996,
title = {Antifferomagnetic FeSe monolayer on SiTiO$_{3}$: The charge doping and electric field effects},
author = {Fawei Zheng and Zhigang Wang and Wei Kang and Ping Zhang},
journal= {arXiv preprint arXiv:1302.2996},
year = {2013}
}