Title

Multi-orbital Hubbard model simulations for cuprates and nickelates

Speaker

Prof. Mi Jiang

Soochow University

Time

10：00am, January 13, 2025

Place

Material Science and Research Building B902

蒋密，2014年于美国加州大学戴维斯分校获得博士学位，2014-2020年在瑞士ETH和加拿大UBC从事博士后研究工作，2021年加入苏州大学物理科学与技术学院。研究兴趣集中在对各类强关联电子体系，如非常规超导体，重费米子材料等的理论和计算研究。近期研究侧重于新近发现的镍基超导体系以及与铜基超导体的异同。

Abstract

Motivated by the recent progress of nickelate superconductors, we explored Hubbard-type multi-orbital models focusing on the superconducting instability, non-Fermi liquid behavior, and charge density wave states. In particular, relevant to Ni-112 superconducting family, we showed that an additional dry metallic band can shift the SC dome of the correlated Hubbard band towards the overdoped regime, namely the d-wave SC can be enhanced (suppressed) in the overdoped (underdoped) regime. Besides, the simulations of three-orbital Emery model showed fruitful non-Fermi liquid behavior in both parameters regimes relevant for cuprates and nickelates. Finally, our recent investigation demonstrated the transition between charge density wave states and homogeneous states in a cluster model for La₃Ni₂O₇.