Depth-resolved core level spectroscopy of noncentrosymmetric solid BiPd
Abstract
Understanding exotic solids is a difficult task as interactions are often hidden by the symmetry of the system. Here, we study the electronic properties of a noncentrosymmetric solid, BiPd, which is a rare material exhibiting both superconductivity and the topological phase of matter. Employing high-resolution photoemission spectroscopy with photon energies ranging from the hard x-ray to extreme-ultraviolet regime, we show that hard x-ray spectroscopy alone is not enough to reveal surface-bulk differences in the electronic structure. We derive the escape depths close to the extreme surface sensitivity and find that the photon energies used for high-resolution photoemission measurements fall in the surface sensitive regime. In addition, we discover a deviation of the branching ratio of Bi core level features derived from conventional quantum theories of the core hole final states. Such a breakdown of the atomic description of the core level spectroscopy can be attributed to the absence of a center of symmetry and spin-orbit interactions.
- Publication:
-
Physical Review B
- Pub Date:
- January 2020
- DOI:
- 10.1103/PhysRevB.101.035426
- arXiv:
- arXiv:1909.10009
- Bibcode:
- 2020PhRvB.101c5426P
- Keywords:
-
- Condensed Matter - Materials Science;
- Condensed Matter - Strongly Correlated Electrons;
- Condensed Matter - Superconductivity
- E-Print:
- Phys. Rev. B 101, 035426 (2020)