This talk will present theoretical studies of electronic structure of
Fe-based superconductors. It will first establish the basic spin/orbital
correlation of the parent compound [1] that is now known to also persist
in the doped superconducting samples. It will then discuss the rich
magnetic correlation in the families [2], followed by our recent finding
of surprising effects of nesting of the itinerant electrons [3].
Finally, the talk will discuss the novel physical effects of the glide
translational symmetry of the system on the electronic structure [4] and
the novel pairing structure [5], highlighting a new class of
superconducting state. I will leave the topic of novel physical effects
due to disordered impurities [6-9] to private discussion after the
talk.
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