Seminars & Lectures
| * TITLE | Explaining two-peak (peak-shoulder) structure of tunneling conductance in FeSe/STO (LiFeAs, Bi2212) superconductor | ||||||
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| * DATE / TIME | 2016-06-28, 15:00 | ||||||
| * ABSTRACT | |||||||
| A longstanding mystery in understanding cuprate superconductors is the inconsistency between the experimental data measured by scanning tunneling spectroscopy (STS) and angle-resolved photoemission spectroscopy (ARPES). In particular, the gap between prominent side peaks observed in STS is much bigger than the superconducting gap observed by ARPES measurements. Moreover, recent FeSe superconductor shows strange two-peak structure. In this talk, I clarify the origin of two-peak (peak-shoulder) structure of tunneling conductance in FeSe (LiFeAs, Bi2212) and reconcile the data measured by STS and ARPES by generalizing a theory which was previously applied to zero-dimensional mesoscopic Kondo systems to strongly correlated two-dimensional super-conductors. I show that the prominent side peaks observed in tunneling conductance measurements in all these materials have a universal origin: They are formed by coherence-mediated tunneling under bias. I show that the density of states (DOS) of the sample can be extracted from the tunneling conductance data and that the extracted DOS is consistent with the superconducting gap measured by ARPES. | |||||||
| * ABSTRACT FILE | 160628 Seminar abstract.docx | ||||||
