University of Minnesota
School of Physics & Astronomy

CM Journal Club

Wednesday, April 5th 2017
4:30 pm:
CM Journal Club in PAN 120
Speaker: Ruiqi Xing
Subject: The hunt for the pairing glue in the cuprates
Refreshments will be served.

To understand the microscopic mechanism of electrons forming cooper pairs in the high-Tc cuprates, in a recent(2016) paper[1], the authors made an attempt to quantitatively determine the pairing interactions for copper-oxide high-Tc superconductors through state-of-the-art laser-based angle-resolved photoemission(ARPES) measurements. I will talk about: (1)the key results they found (how they get the pairing interactions between electrons); (2) "loop current" theory, which they use to explain the experiments; how the idea
of marginal Fermi-liquid and loop current is developed by Chandra Varma et al. to explain phenomenon in cuprates; some concepts, some illustration through derivation (depending on the interest of audience) and current status of this theory.

Ref:
[1]Bok et al., "Quantitative determination of pairing interactions for high-temperature superconductivity in cuprates", Sci. Adv., 2,e150132(2016)
http://advances.sciencemag.org/content/2/3/e1501329
[2]Andrey V Chubukov, "The hunt for the pairing glue in the cuprates", http://www.condmatjournalclub.org/jccm-content/uploads/2016/03/JCCM_Mar_2016_01.pdf
[3]Vivek Aji, Arkady Shekhter, and C. M. Varma, "Theory of the coupling of quantum-critical fluctuations to fermions and d-wave superconductivity in cuprates", Phys. Rev. B 81, 064515(2010), etc.

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