ARPES Study on the Electronic Structure of FeTe

Among the iron-based superconductors, iron chalcogenides FeSe$_{x}$Te$_{1-x}$ (T$_{c}\sim $20K) are special for their structural simplicity. FeTe, the parent compound for iron chalcogenides, though without superconducting transition, shows a unique antiferromagnetic order below tetragonal-orthorhombic structural phase transition temperature. Here we present recent ARPES results on this material, including measurements on electronic band structure and Fermi surface topology. We discovered strong k$_{z}$ dispersion of the Fermi surface and observed electronic band evolution through phase transition. The comparison of iron chalcogenides and other iron-based superconductor families helps us identify the governing physics in this new family of superconductors.