CM Journal Club

semester, 2017


Wednesday, January 18th 2017
4:30 pm:
CM Journal Club in PAN 120
There will be no journal club this week.

Wednesday, February 1st 2017
4:30 pm:
CM Journal Club in PAN 120
No JC this week.

Wednesday, February 8th 2017
4:30 pm:
CM Journal Club in PAN 120
To be announced.

Wednesday, February 22nd 2017
4:30 pm:
CM Journal Club in PAN 120
To be announced.

Wednesday, March 1st 2017
4:30 pm:
CM Journal Club in PAN 120
Subject: Short meeting

Wednesday, March 22nd 2017
4:30 pm:
CM Journal Club in PAN 120
Speaker: Xuzhe Ying
Subject: Commensurate Incommensurate transition

Wednesday, March 29th 2017
4:30 pm:
CM Journal Club in PAN 120
Speaker: Mengxing Ye
Subject: Kitaev Spin Liquid
Refreshments will be served.

I will follow Kitaev's original paper [1] and show how the Kitaev honeycomb model can be solved exactly by reduction to free fermions (in a static Z2 gauge field). It is also a good example to see how "quantum order", which pertains to quantum spin liquid, emerges in the spin system. I will try to make the talk friendly to junior graduate students, and the derivation only requires graduate level quantum mechanics.

[1] A. Kitaev, 'Anyons in an exactly solved model and beyond'


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.


Wednesday, April 12th 2017
4:30 pm:
CM Journal Club in PAN 120
Speaker: Konstantin Reich
Subject: Basics of Polymer Physics
Refreshments will be served.

Wednesday, April 19th 2017
4:30 pm:
CM Journal Club in PAN 120
Speaker: No CM Journal Club This Week

Wednesday, April 26th 2017
4:30 pm:
CM Journal Club in PAN 120
Subject: There will be no CM Journal club

Wednesday, May 3rd 2017
4:30 pm:
CM Journal Club in PAN 120
Speaker: Daniel Shaffer, University of Minnesota
Subject: Topological Superconductor
Refreshments will be served.

References:
1.Masatoshi Sato, Yoichi Ando, 'Topological superconductors: a review', https://arxiv.org/abs/1608.03395
2.Barry Simon, 'Holonomy, the Quantum Adiabatic Theorem, and Berry's Phase
', https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.51.2167
3.Edward Witten, 'Three Lectures On Topological Phases Of Matter', https://arxiv.org/abs/1510.07698


Wednesday, September 6th 2017
4:30 pm:
CM Journal Club in PAN 120
No journal club this week.

Wednesday, September 13th 2017
4:30 pm:
CM Journal Club in PAN 120
Speaker: To be announced.

Wednesday, September 20th 2017
4:30 pm:
CM Journal Club in PAN 120
Speaker: No CM Journal Club

Wednesday, October 4th 2017
4:30 pm:
CM Journal Club in PAN 120
There is no journal club this week.

Wednesday, October 11th 2017
4:30 pm:
CM Journal Club in PAN 120
To be announced.

Tuesday, October 17th 2017
3:30 pm:
CM Journal Club in Tate-301-20
Speaker: Laxman Raju Thoutam, CEMS, University of Minnesota
Subject: Research update: Conductivity and beyond at the LAO/STO interface
Please note change of time, room and day for the seminar, this week only.

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