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4시 20분부터 제1과학관 31214 e+강의실에서 다과를 준비하오니 많은 참석 부탁드립니다.

아 래

Title: Quantitative Determination of High Tc Superconductivity Mechanism

Speaker: Prof. Han-Yong Choi (SKKU & APCTP)

Date & Time: April. 6(Wed.) 2016, 4:30 PM

Place: Natural Science 1,  Room No. 31214

Abstract:

After all some thirty years of intense research into the cuprate superconductors, the mechanism of high Tc superconductivity ever remains elusive. One may wonder why – why the high Tc problem is so difficult. This talk is my 50 minute answer to that question. As a prelude I will walk the audience through the problems of the low Tc superconductors which Bardeen, Cooper, Schrieffer, Eliashberg, and McMillan faced and the ideas they eventually came up with. For cuprates, it is established that superconductivity is also from pairing, but of the d-wave symmetry. The root of the high Tc conundrum lies in the requirement that the superconductivity must be understood together with the pseudogap and anomalous normal states in their totality. Leading ideas for high Tc superconductivity mechanism consistent with the d-wave pairing are the resonating valence bond, the loop current order, and the antiferromagnetic spin fluctuations scenarios. Perhaps one of the best ways to differentiate among the proposals is to determine the frequency and momentum dependence of the self-energy from experiments and compare it with the proposed ideas. This procedure may be implemented, it turns out, by using the ultra high resolution laser angle resolved photoemission spectroscopy (ARPES). The extracted self-energy from Korea-China-US collaboration from ARPES analysis of Bi2212 cuprates will be presented and discussed from this perspective.