Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session E44: New Developments in STM on Surfaces of Unconventional Superconductors and Related SystemsInvited
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Sponsoring Units: DCMP Chair: Ilya Eremin, Ruhr University Bochum Room: BCEC 210C |
Tuesday, March 5, 2019 8:00AM - 8:36AM |
E44.00001: Determination of the superconducting gap sign by the phase referenced method: successful practice in cuprate and several iron based superconductors Invited Speaker: Hai-Hu Wen In many unconventional superconductors, the superconducting gap will change sign along the Fermi surface. The fundamental reason for this behavior is that the Cooper pairing may be established through a repulsive interaction, instead of the attractive interaction in phonon mediated pairing picture. However to detect this gap sign is not easy at all. The usual method for solving this problem is to measure the behavior of phase difference or supercurrent through a Josephson junction. However, this method seems not working well in systems with multi-Fermi pockets and with the same sign in individual pocket. Such circumstances happen in many iron based superconductors. |
Tuesday, March 5, 2019 8:36AM - 9:12AM |
E44.00002: Pairing gap symmetry in optimally doped NaFeAs Invited Speaker: Abhay Pasupathy TBD |
Tuesday, March 5, 2019 9:12AM - 9:48AM |
E44.00003: Lessons from modeling of tunneling spectroscopy on FeSe Invited Speaker: Brian Andersen Iron-based superconductors have been extensively studied both experimentally and theoretically over the last decade, with great progress in our understanding of these materials. Recent focus on FeSe has been centered on the connection between nematicity and superconductivity, and the possibility of enhancing Tc in monolayers on STO, or by pressure. In this talk, I will focus on two aspects of the theoretical study of tunneling spectroscopy on unconventional superconductors, 1) the physics of disorder generated local order, and 2) the understanding of recent scanning tunneling experiments mapping out the detailed spectroscopic features of FeSe by the Davis group at Cornell University. I will explain the recent evidence for orbital selective superconducting pairing, and the direct detection of orbital selective quasiparticles by quasi-particle interference. This highlights the correlated nature of FeSe, more specifically its Hund’s metal nature with coexisting orbital-dependent coherent and incoherent low-energy states. I then proceed to discuss the theoretical modelling of these phenomena and the implications for our understanding of the magnetic properties of FeSe. This is relevant for understanding the origin of superconductivity in FeSe in particular, and in the iron-based superconductors in general. |
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