The electronic structure of nearly optimally-doped novel superconductor LaO1−xFxBiS2 (x = 0.46) was investigated using angle-resolved photoemission spectroscopy (ARPES). We clearly observed band dispersions from 2 to 6 eV binding energy and near the Fermi level (EF), which are well reproduced by first principles calculations when the spin-orbit coupling is taken into account. The ARPES intensity map near EF shows a square-like distribution around the Γ(Z) point in addition to electronlike Fermi surface (FS) sheets around the X(R) point, indicating that FS of LaO0.54F0.46BiS2 is in close proximity to the theoretically-predicted topological change.
@article{arxiv.1412.7786,
title = {Proximity to Fermi-surface topological change in superconducting LaO0.54F0.46BiS2},
author = {K. Terashima and J. Sonoyama and T. Wakita and M. Sunagawa and K. Ono and H. Kumigashira and T. Muro and M. Nagao and S. Watauchi and I. Tanaka and H. Okazaki and Y. Takano and O. Miura and Y. Mizuguchi and H. Usui and K. Suzuki and K. Kuroki and Y. Muraoka and T. Yokoya},
journal= {arXiv preprint arXiv:1412.7786},
year = {2015}
}