Van Hove singularities, chemical pressure and phonons: an angle-resolved photoemission study of KFe${}_2$As${}_2$ and CsFe${}_2$As${}_2$

P. Richard, A. van Roekeghem, X. Shi +6

We report an angle-resolved photoemission spectroscopy (ARPES) study of KFe${}_2$As${}_2$ and CsFe${}_2$As${}_2$, revealing the existence of a van Hove singularity affecting the electronic…