Interband scattering- and nematicity-induced quantum oscillation frequency in FeSe

Valentin Leeb, Johannes Knolle

Research output: Contribution to journalArticlepeer-review


Understanding the nematic phase observed in the iron-chalcogenide materials is crucial for describing their superconducting pairing. Experiments on FeSe1-xSx showed that one of the slow Shubnikov-de Haas quantum oscillation frequencies disappears when tuning the material out of the nematic phase via chemical substitution or pressure, which has been interpreted as a Lifshitz transition [Coldea et al., npj Quantum Mater. 4, 2 (2019)2397-464810.1038/s41535-018-0141-0; Reiss et al., Nat. Phys. 16, 89 (2020)1745-247310.1038/s41567-019-0694-2]. Here, we present a generic, alternative scenario for a nematicity-induced sharp quantum oscillation frequency, which disappears in the tetragonal phase and is not connected to an underlying Fermi surface pocket. We show that different microscopic interband scattering mechanisms - for example, orbital-selective scattering - in conjunction with nematic order can give rise to this quantum oscillation frequency beyond the standard Onsager relation. We discuss implications for iron-chalcogenides and the interpretation of quantum oscillations in other correlated materials.

Original languageEnglish
Article numberL081109
JournalPhysical Review B
Issue number8
StatePublished - 15 Feb 2024


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