It is still under debate whether unconventional superconductors can still be described in terms of Bogoliubov quasiparticles in the superconducting state. Here, angle-resolved photoemission spectroscopy measurements on FeSe/SrTiO3 films reveal particle-hole mixed Bogoliubov quasiparticles, despite the likely unconventional pairing mechanism.
- Zhiyuan Wei
- Shaozhi Li
- Junfeng He