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Seminars & Lectures

* TITLE

Density of states of exotic superconductors from tunneling spectroscopy

* SPEAKERS

Name	Affiliation	E-mail
Jongbae Hong	Center for Theoretical Physics of Complex Systems, IBS

* HOST(Applicant)

Name	Affiliation	E-mail
Eunyoung Choi	APCTP	eunyoung.choi(at)apctp.org

* DATE / TIME

2016-10-11, 11am, 512 Seminar room, APCTP

* ABSTRACT

A mystery in understanding cuprate superconductors is the inconsistency

between the experimental data for superconducting gap observed by scanning

tunneling spectroscopy (STS) and angle-resolved photoemission spectroscopy

(ARPES). The gap between prominent two side peaks observed in STS is much

bigger than the superconducting gap recently observed by ARPES. This

mismatching also happens in Fe-based superconductors. In this talk, I reconcile

the STS and the ARPES by extracting sample density of states (DOS) from the

STS data, and clarify that the abovementioned mystery is resolved by

discriminating between tunneling conductance and sample DOS for strongly

correlated superconductors. This work is given by generalizing a theory which

was previously applied to zero-dimensional quantum impurity systems to

strongly correlated two-dimensional materials. I will show that the commonly

observed two side peaks in STS have a universal origin: They are formed by

coherence-mediated tunneling under bias.

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