Dimer Physics and Superconductivity in La3Ni2O7
2024.01.09 15:35
날짜 | 2024-01-16 14:00 |
---|---|
일시 | Jan.16th (Tue.),14:00 |
장소 | E6-2, #1323 |
연사 | Siheon Ryee (University of Hamburg, Germany) |
Nickelated 초전도체에 관한 세미나를 개최하오니, 관심 있는 분들의 많은 참석 바랍니다.
- Date & Time: Jan. 16th (Tue.), 2024 / 14:00 ~ 16:00
- Place: E6-2 (Rm. 1323)
- Title : Dimer Physics and Superconductivity in La3Ni2O7
- Lecturer : Siheon Ryee [University of Hamburg, Germany]
- Abstract:
The recent discovery of superconductivity with Tc ~ 80 K in the bilayer nickelate La3Ni2O7 under high pressure heralds a new class of high-Tc superconductors. The most notable feature of this material is a strong interlayer electronic coupling unlike many unconventional superconductors. In this respect, central questions concern “How does the interlayer coupling affect the low-energy physics?" and “Is the interlayer coupling a friend or foe of superconductivity?". In this talk, I will demonstrate using a cluster dynamical mean-field theory that nonlocal self-energy driven by the interlayer coupling in La3Ni2O7 induces a Lifshitz transition of Fermi surface topology. By solving a relevant gap equation, I will further argue that superconductivity is promoted by this “dimer” electronic correlation. The underlying mechanism is the quenching of a strong ferromagnetic channel resulting from the Fermi surface change. This finding unveils the role of interlayer coupling in La3Ni2O7 and potentially paves the way to designing higher-Tc nickelates.
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