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Seminars

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  • Title:Superconducting pairing in the Hubbard and t'-Hubbard model
  • Start Date/Time:2019-12-10 / 13:30
  • End Date/Time :2019-12-10 / 15:10
    • Speaker:Dr. Chia-Ming Chung (Ludwig Maximilian University of Munich)
    • Place:Lecture Room A of NCTS, 4F, 3rd General Building, Nat'l Tsing Hua Univ.
    • Host:Prof. Shu-Jung Tang (NTHU)
    • Abstract:
      The Hubbard model is a fundamental model to understand the superconductivity in cuprates. The ground state of the Hubbard model for the moderate interaction and weak doping has been shown a striped state. We study the superconductivity (SC) in the Hubbard and the t'-Hubbard model by using density matrix renormalization group (DMRG) and auxiliary field quantum Monte Carlo (AFQMC). I will first show that the ground state in Hubbard model, although presents d_{x^2+y^2} pairing, does not have long-range superconductivity. I will then discuss the pairing in the t'-Hubbard model, especially related to the recent discovery of quasi-long-range SC in the t'- Hubbard model on the 4-leg cylinders.

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