Further evidence of concurrent mass enhancement and superconductivity in a topological state

Previously^1,2, we reported on the concurrent onset of mass enhancement at the Dirac point below the superconducting transition in FeSe_xTe_1-x. In this talk, we will review these results and provide more evidence of this phenomenon using low energy laser-based ARPES measurements. Given the increased interest in this system, due in part to the co-existence of superconductivity and non-trivial topology, our results show that this system is even more complicated than perhaps previously presumed and may require re-interpretation of recent experimental reports.

¹2019 APS March Meeting (talk: K05.00009)
²arXiv:1907.11602 [cond-mat.supr-con]