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Superconductivity enhanced by pair fluctuations between wide and narrow bands
Changming Yue, Hideo Aoki, Philipp Werner
Full or empty narrow bands near the Fermi level are known to enhance superconductivity by promoting scattering processes and spin fluctuations. Here, we demonstrate that doublon-ho…
Nematicity-enhanced superconductivity in systems with a non-Fermi liquid behavior
Sharareh Sayyad, Motoharu Kitatani, Abolhassan Vaezi +1
We explore the interplay between nematicity~(spontaneous breaking of the sixfold rotational symmetry), superconductivity, and non-Fermi liquid behavior in partially flat-band model…
Resonant pair-exchange scattering and BCS-BEC crossover in a system composed of dispersive and heavy incipient bands: a Feshbach analogy
Kazunari Ochi, Hiroyuki Tajima, Kei Iida +1
We theoretically show that a two-band system with very different masses harbors a resonant pair scattering that leads to novel pairing properties, as highlighted by the Bardeen-Coo…
Superconducting mechanism for the cuprate BaCuO based on a multiorbital Lieb lattice model
Kimihiro Yamazaki, Masayuki Ochi, Daisuke Ogura +4
For the recently discovered cuprate superconductor , we propose a lattice structure which resembles the model considered by Lieb to represent the vastly o…
Theoretical possibilities for flat-band superconductivity
Hideo Aoki
One novel arena for designing superconductors with high is the flat-band systems. A basic idea is that flat bands, arising from quantum mechanical interference, give unique o…
Model construction and a possibility of cuprate-like pairing in a new d9 nickelate superconductor (Nd,Sr)NiO2
Hirofumi Sakakibara, Hidetomo Usui, Katsuhiro Suzuki +3
Effective models are constructed for a newly discovered superconductor (Nd,Sr)NiO2, which has been considered as a possible nickelate analogue of the cuprates owing to the d9 elect…