  We use high-resolution angle-resolved photoemission spectroscopy to
investigate the electronic structure of the antiferromagnetic heavy fermion
compound CePt2In7, which is a member of the CeIn3-derived heavy fermion
material family. Weak hybridization among 4f electron states and conduction
bands was identified in CePt2In7 at low temperature much weaker than that in
the other heavy fermion compounds like CeIrIn5 and CeRhIn5. The Ce 4f spectrum
shows fine structures near the Fermi energy, reflecting the crystal electric
field splitting of the 4f^1_5/2 and 4f^1_7/2 states. Also, we find that the
Fermi surface has a strongly three-dimensional topology, in agreement with
density-functional theory calculations.
