自旋轨道耦合和强关联效应共同作用下的新颖量子相和集体激发的研究

自旋轨道耦合和强关联效应之间的相互作用会导致许多新奇的物理现象，是当前凝聚态物理研究的热点之一。本项目计划以最近引起广泛关注的4d和5d材料为研究对象，研究在自旋轨道耦合和强关联效应共同作用下系统金属-绝缘体转变的机制，以及系统中可能出现的各种新颖量子相，研究各种量子相之间的竞争或者共存，阐明其相变机理，解释实验在4d和5d材料中发现的若干奇异物性。在此基础上，研究系统的单粒子和各种集体激发模式，以及各种激发随系统掺杂的演化，揭示存在自旋轨道耦合情况下强关联电子系统中各种激发的新特点，解释4d和5d材料中相关的实验结果，同时还将研究在4d和5d材料中实现非常规超导电性的可能性。

The interplay between spin-orbital coupling and strong-correlation effect can induce many peculiar physical properties, which is one of the central issues in the current research of condensed matter physics. In this project, we will focus on the 4d and 5d materials, which have recently attracted considerable interest. To understand the novel physical properties of the 4d and 5d materials revealed by experiments, we will study the mechanism of the metal-insulator transition and the possible exotic quantum phases arising from the combined influence of the spin-orbital coupling and strong-correlation effect. We will clarify the physics of quantum phase transitions based on the analysis of the competition or coexistence of these quantum phases. Based on these studies, we will study the single-particle and collective excitations, together with their evolutions with the doping, to reveal the characteristics of the excitations in the strongly correlated systems with spin-orbital coupling and explain the experimental results in 4d and 5d materials. Moreover, we will research the possibility of superconductivity in 4d and 5d materials.