Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 67: Unconventional Superconductors
TT 67.12: Vortrag
Donnerstag, 21. März 2024, 12:45–13:00, H 3007
Local probe of the effective charge of a nodal superconductor — •Maialen Ortego Larrazabal1, Jiasen Niu2, Jian-Feng Ge2, Genda Gu3, Ingmar Swart1, and Milan P. Allan2 — 1Debye Institute for Nanomaterials Science, Utrecht University, 3508 TA Utrecht, The Netherlands — 2Leiden Institute of Physics, Leiden University, 2333 CA Leiden, The Netherlands — 3Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, NY 11973 Upton, USA
Shot-noise is a powerful tool for determining the effective charge of the carriers of mesoscopic systems. This method provides unique information about a broad range of materials such as superconductors and fractional quantum Hall systems [1,2]. We combine scanning tunnelling microscopy with shot-noise spectroscopy in order to get local information with atomic resolution [3]. In a s-wave BCS superconductor, we observe shot-noise doubling inside of the superconducting gap due to Andreev reflection processes [4]. For superconductors with d-wave pairing symmetry, however, things get more complicated, as the nodal quasiparticles change the situation. Here, I will discuss first results of local shot-noise measurements on the unconventional superconductor Bi2Sr2CaCu2O8+p.
[1] Y. Ronen et al., Proc. Natl. Acad. Sci. U. S. A. 113 (2016) 1743
[2] R. de-Picciotto et al., Nature 389 (1997) 162
[3] K. M. Bastiaans et al., Rev. Sci. Instrum. 89 (2018) 093709
[4] K. M. Bastiaans et al., Phys. Rev. B 100 (2019) 104506
Keywords: superconductivity; correlated electrons; scanning tunneling microscopy; shot noise