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날짜 2024-06-12 16:00 
일시 Jun 12th (Wed), 4:00pm 
장소 E6-2, #1323 
연사 Dr. Hanbit Oh (Johns Hopkins University) 

아래와 같이 세미나를 개최하고자 하오니, 관심있는 분들의 많은 참석 부탁드립니다.

 

Date: 4:00 pm, 12th Jun (Wed)
Place: E6-2, #1323
Speaker: Dr. Hanbit Oh (Department of Physics and Astronomy, Johns Hopkins University)
Title: New high Tc superconductivity and symmetric pseudogap metal in the bilayer nickelate La3Ni2O7-Part2
Abstract: 

The recent discovery of an 80 K superconductor in La3Ni2O7 has attracted considerable interest. While numerous theoretical frameworks have been proposed, most assume that bilayer nickelates reside in the Mott-Hubbard regime. However, recent experiments suggest that La3Ni2O7 may belong to the charge transfer regime.  In the first part of the talk, I present the charge transfer regime of the bilayer nickelates by accounting for doped holes entering the oxygen p orbitals. Interestingly, we show that the Zhang-Rice doublon state emerges as the proper low-energy degrees of freedom for the hole-doped state, distinct from the Zhang-Rice singlet in hole-doped cuprates [3].  The low energy theory in the charge transfer regime is also demonstrated as a bilayer type-II t-J model previously proposed in the Mott- Hubbard regime. Given the richness of this physics, there is a natural desire to simulate the superconductivity using programmable quantum simulators to explore diverse physics phenomena. In the second part of the talk, I present a theoretical proposal to utilize the tetralayer optical lattice systems with ultracold atoms to simulate novel bilayer nickelate superconductors. Notably, the synthetic Kondo interaction simulated in the cold atom system is antiferromagnetic, contrasting with the ferromagnetic Hund coupling inherent in nickelate materials. This difference in the sign of the Kondo interaction enhances the pairing gap, equivalently to Tc allowing us to detour the challenge of reaching ultra-low temperatures in cold atom experimental setups. We further propose a signature to identify the pairing state can be applied to the snapshot measurements.

[1] Hanbit Oh and Ya-Hui Zhang, Phys. Rev. B 108 (2023)

[2] Hui Yang*, Hanbit Oh*, Ya-Hui Zhang, arXiv:2309.15095 (2023)

 

[2] Hanbit Oh, Boran Zhou, Ya-Hui Zhang, arXiv:2405.00092 (2024)

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