FeSe and the missing electron pocket problem

Luke C. Rhodes *, Matthias Eschrig , Timur K. Kim , Matthew D. Watson 

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The nature and origin of electronic nematicity remains a significant challenge in our understanding of the iron-based superconductors. This is particularly evident in the iron chalcogenide, FeSe, where it is currently unclear how the experimentally determined Fermi surface near the M point evolves from having two electron pockets in the tetragonal state, to exhibiting just a single electron pocket in the nematic state. This has posed a major theoretical challenge, which has become known as the missing electron pocket problem of FeSe, and is of central importance if we wish to uncover the secrets behind nematicity and superconductivity in the wider iron-based superconductors. Here, we review the recent experimental work uncovering this nematic Fermi surface of FeSe from both ARPES and STM measurements, as well as current theoretical attempts to explain this missing electron pocket of FeSe, with a particular focus on the emerging importance of incorporating the dxy orbital into theoretical descriptions of the nematic state. Furthermore, we will discuss the consequence this missing electron pocket has on the theoretical understanding of superconductivity in this system and present several remaining open questions and avenues for future research.
Original languageEnglish
Article number859017
Number of pages22
JournalFrontiers in Physics
Publication statusPublished - 9 May 2022


  • FeSe
  • Electronic strucutre
  • Superconductivity
  • Nematicity
  • Strong correlations
  • Iron based superconductors


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