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TT: Fachverband Tiefe Temperaturen
TT 68: Superconductivity: Properties and Electronic Structure
TT 68.6: Talk
Thursday, March 21, 2024, 10:45–11:00, H 3010
What scanning tunneling spectra on superconductors can tell us about the spectral density of the pairing boson — •Thomas Gozlinski1,2, Mirjam Henn1, Thomas Wolf1, Matthieu LeTacon1, Jörg Schmalian1, and Wulf Wulfhekel1 — 1Karlsruhe Institute of Technology (KIT) — 2Ludwig-Maximilians-Universität München (LMU)
A detailed interpretation of scanning tunneling spectra obtained on superconductors enables one to gain information on the pairing boson. Decisive for this approach are inelastic tunneling events. Due to the lack of momentum conservation in tunneling from or to the sharp tip, those are enhanced in the geometry of a scanning tunneling microscope compared to planar tunnel junctions. We will introduce the theoretical framework [1] and discuss the reliability and limitations of our method by taking the examples of real scanning tunneling spectra obtained on conventional [2] and unconventional [3,4] superconductors. Especially for the d-wave cuprate superconductors [4] we propose how the boson excitation spectrum can be compared to and complement glue functions determined from optical spectroscopy or ARPES.
[1] P. Hlobil et al., Phys. Rev. Lett. 118 (2017) 167001.
[2] M. Schackert et al., Phys. Rev. Lett. 114 (2015) 047002.
[3] J. Jandke et al., Phys. Rev. B 100 (2019) 020503(R).
[4] T. Gozlinski et al., arXiv:2306.03890 (2023)
Keywords: scanning tunneling spectroscopy; glue function; bosonic excitations; cuprates; Fe-based superconductors