We investigate the electronic structure of a noncentrosymmetric superconductor, BiPd using photoemission spectroscopy with multiple photon energies ranging from ultraviolet to hard x-ray. Experimental data exhibit interesting difference in the surface and bulk electronic structures of this system. While the surface Bi core level peaks appear at lower binding energies, the surface valence band features are found at the higher binding energy side of the bulk valence band; valence band is primarily constituted by the Pd 4d states. These changes in the electronic structure cannot be explained by the change in ionicity of the constituent elements via charge transfer. Analysis of the experimental data indicates that the Bi-Pd hybridization physics plays the key role in deriving the anomalous spectral evolution and the electronic properties of this system.
@article{arxiv.2005.01267,
title = {Anomalous spectral evolution with bulk sensitivity in BiPd},
author = {Arindam Pramanik and Ram Prakash Pandeya and Khadiza Ali and Paolo Moras and Polina M. Sheverdyaeva and Carlo Carbone and Bhanu Joshi and A. Thamizhavel and S. Ramakrishnan and Kalobaran Maiti},
journal= {arXiv preprint arXiv:2005.01267},
year = {2020}
}