Koen Bastiaans

january, 2020

22jan3:00 pm4:00 pmKoen BastiaansLeiden University, Netherlands3:00 pm - 4:00 pm Saturn Seminar Room

Event Details

Koen Bastiaans

Academic Affiliation: Leiden University, Netherlands

Research Area: Develop and use novel techniques for STM to investigate quantum matter.

Talk date: January 22, 2020

A strongly inhomogeneous superfluid in an iron-based superconductor

Although the possibility of spatial variations in the superfluid of unconventional, strongly correlated superconductors has been suggested, it is not known whether such inhomogeneities – if they exist – are driven by disorder, strong scattering, or other factors. In this talk I will show how we use Josephson scanning tunneling microscopy to reveal a strongly inhomogeneous superfluid in the iron-based superconductor FeTe0.55Se0.45. By simultaneously acquiring the topographic and electronic properties, we find that this inhomogeneity in the superfluid is not caused by structural disorder or strong inter-pocket scattering, and does not correlate with variations in the energy of the Cooper pair-breaking gap. Instead, we see a clear spatial correlation between superfluid density and the quasiparticle strength, defined as the height of the coherence peak, on a local scale. [1]

[1] D. Cho*, K.M. Bastiaans* et al. Nature 571, 541 (2019)


(Wednesday) 3:00 pm - 4:00 pm


Saturn Seminar Room

3F-367, Research Cooperation Building, 52 Ewhayeodae-gil, Daehyeon-dong

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