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Department of Physics & Astronomy

High temperature superconductivity in cuprates: How to pin down the pairing interaction

2018-05-30l 조회수 883
일시 : 2018-05-30 16:00 ~
연사 : 최한용 (성균관대학교)
담당 :
장소 : 56동106호
The mechanism of high Tc superconductivity in cuprates ever remains elusive after more than thirty years of intense research. One may wonder why – why the high Tc problem is so difficult and what constitutes a solution. This talk is my fifty minutes answer to that question. As a prelude, I will walk the audience through the problems of the low temperature superconductivity Bardeen, Cooper, Schrieffer, and others faced and the ideas they eventually came up with. The cuprate 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 pseudo-gap and anomalous normal states in their totality. This is a tall order indeed given the plethora of complexities observed in cuprates. Leading ideas for pairing 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 these proposals is to determine the frequency and momentum dependence of the self-energies from experiments and compare them with those from the proposed ideas. This procedure may be implemented by using the ultra high resolution laser angle resolved photoemission spectroscopy (ARPES) experiments. The extracted self-energies from Korea-China-US collaboration on the ARPES analysis of Bi2212 cuprates will be presented and discussed from this perspective.
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