| Abstract: | Surface states that have a dz~2 symmetry around the center of the surface Brillouin zone(BZ) have been regarded common in closely-packed surfaces of rare-earth metals. In this work, we report the electronic structure of dhcp La(0001) thin films by ultrahigh energy resolution angle-resolved photoemission spectroscopy(ARPES) and first principle calculations. Our first principle analysis is based on the many-body approach, therefore, density function theory(DFT) combined with dynamic mean-field theory(DMFT). The experimentally observed Fermi surface topology and band structure close to the Fermi energy qualitatively agree with first principle calculations when using a renormalization factor of between 2 and 3 for the DFT bands. Photon energy dependent ARPES measurements revealed clear k_Z dependence for the hole-like band around the BZ center, previously regarded as a surface state. The obtained ARPES results and theoretical calculations suggest that the major bands of dhcp La(0001) near the Fermi level originate from the bulk La 5 d orbits as opposed to originating from the surface states. |
