Abstract：
:By growing monolayer FeSe on SrTiO3(001) surface, researchers obtain the highest superconducting transition-temperature for iron-based superconductor. Here, we study the antiferromagnetic (AFM) checkerboard monolayer FeSe adsorbed on SrTiO3(001) surface. 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 Brillouin zone (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. It is revealed that the striking disappearance of the Fermi surface around the BZ center can be well explained by the AFM checkerboard phase with charge doping and electric field effects. 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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Zheng F,Wang Z,Kang W,Zhang Pdoi
10.1038/srep02213subject
Has Abstractpub_date
2013-01-01 00:00:00pages
2213issn
2045-2322pii
srep02213journal_volume
3pub_type
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