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We have performed an angle-resolved photoemission spectroscopy study of thenew iron-based superconductor K0.8Fe1.7Se2 (Tc ~ 30 K). Clear band dispersionis observed with the overall bandwidth renormalized by a factor of 2.5 comparedto our local density approximation calculations, indicating relatively strongcorrelation effects. Only an electronlike band crosses the Fermi energy,forming a nearly circular Fermi surface (FS) at M ({\pi}, 0). The holelike bandat {\Gamma} sinks ~ 90 meV below the Fermi energy, with an indirect band gap of30 meV to the bottom of the electronlike band. The observed FS topology in thissuperconductor favors ({\pi}, {\pi}) inter-FS scattering between theelectronlike FSs at the M points, in sharp contrast with other iron-basedsuperconductors which favor ({\pi}, 0) inter-FS scattering between holelike andelectronlike FSs.

Absence of holelike Fermi surface in superconducting K0.8Fe1.7Se2 revealed by ARPES