Observation of concurrent mass enhancement and superconductivity in a topological state
ORAL
Abstract
Low energy, laser-based ARPES is used to examine the temperature dependence of a topological state previously reported1,2 for the Fe-based superconductors, FeSexTe1-x. In the present study of the same system at temperatures below the superconducting transition we observe the concurrent onset of mass enhancement at the Dirac point, suggestive of time reversal symmetry breaking, and the appearance of the superconducting gap at the Fermi level crossing. We discuss possible explanations for the coincident presence of these two gaps below Tc. At the same time, focusing on the Dirac state provides some evidence for increased robustness of superconductivity in the surface layer.
1Zhang et al., Science 360, 182 (2018)
2J.D. Rameau et al., (submitted)
1Zhang et al., Science 360, 182 (2018)
2J.D. Rameau et al., (submitted)
*The work carried out at Brookhaven was supported in part by the U.S. DOE under Contract No. DE- SC0012704 and in part by the Center of Computational Design of Functional Strongly Correlated Materials and Theoretical Spectroscopy.
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Presenters
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Nader Zaki
- Brookhaven National Laboratory