CFN Colloquium

"Atomic layer level tunneling experiments on the pairing symmetry of cuprates and Fe-based superconductors"

Presented by Qi-Kun XUE, Tsinghua University

Thursday, August 6, 2020, 9:00 am —

We investigate the pairing mechanism of high Tc superconductivity with atomic-layer resolution in cuprates and iron-pnictides by using state-of-the-art molecular beam epitaxy (MBE)-scanning tunneling microscopy (STM) and exfoliation technique. With these techniques, we are able to investigate the gap structure and pairing symmetry of superconducting copper oxides and FeSe planes directly by STM, as well as Josephson tunneling down to few layers in junction structures. We show that the pairing symmetry in both systems is isotropic or contains significant isotropic component.


Qi-Kun Xue received his BSc in Shandong University in 1984, and PhD degree in condensed matter physics from Institute of Physics, the Chinese Academy of Sciences (CAS) in 1994. From 1994 to 1999, he worked as a Research Associate at IMR, Tohoku University, Japan and a visiting Assistant Professor at Department of Physics, North Carolina State University, USA. He became a professor at Institute of Physics, CAS in 1999. He was elected into The Chinese Academy of Sciences in 2005. Since 2005, he has been a distinguished professor at Department of Physics, Tsinghua University. From 2010 to 2013, he was the Chair of Department of Physics and the Dean of School of Sciences. He has been the Vice President for Research of Tsinghua University since 2013 and the Director of Beijing Academy of Quantum Information Sciences since 2017. He was elected as a Fellow of American Physical Society in 2016. He won the TWAS Prize in Physics in 2010, the Future Science Prize for Physical Sciences in 2016, State Natural Science Award (the First Prize) in 2018 and The Fritz London Memorial Prize in 2020.
His research interests include scanning tunneling microcopy/spectroscopy, molecular beam epitaxy, low-dimensional and interface-related superconductivity, topological insulators, and quantum size effects in various low-dimensional structures. He has authored/coauthored ~500 papers and presented 180 invited/keynote/plenary talks at international meetings/conferences. Currently, he is the Associate Editors-in-Chief of National Science Review, the Editors-in-Chief of Surface Review & Letters, and on the Editorial Board of Applied Physics Letters, Journal of Applied Physics, AIP Advances, Surface Science Reports and Nano Letters.

Hosted by: Jurek Sadowski

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