University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Monday, December 1st 2014
1:00 pm:
CM Journal Club in 210 Tate
Speaker: Xiaoyu Wang
Subject: Pair Density Wave in Cuprate Superconductors and Case Study of Two-leg Hubbard-Heisenberg Model

The mysterious pseudogap phase in cuprate superconductors is characterized by many types of fluctuating orders, such as SDW and CDW. The onset temperature of these orders are similar to SC. One view is that SDW and CDW are competing phases of SC, and that the system is fine tuned close to a multicriticality such that all orders have similar transition temperatures. Another view, proposed by Fradkin & Kivelson, is that this is a pair density wave (PDW) state --- a FFLO SC without magnetic fields. Such a state is characterized by a spin gap and power law SC, SDW and CDW correlations. I will talk about the two-leg Hubbard-Heisenberg model, and show that PDW appears naturally. I will briefly mention how this model is related to the cuprate superconductors.
[1] E. Fradkin, S.A. Kivelson and J.M. Tranquada, arXiv:1407:4480
[2] A. Jaefari and E. Fradkin, Phys. Rev. B 85, 035104 (2012)

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