空穴掺杂的铱氧化物中奇异量子现象的研究

发现和理解掺杂莫特绝缘体产生的奇异量子现象是凝聚态物理研究中的核心问题。铱氧化物作为一种典型的自旋轨道耦合莫特绝缘体为该研究提供了非常好的研究平台。对铜氧化物，无论是进行电子掺杂还是空穴掺杂，都可以实现高温超导、赝能隙、电荷有序等，得到非常类似的相图；对铱氧化物进行电子掺杂，在Sr2IrO4体系中发现了与铜氧化物类似的费米弧，赝能隙，d波能隙等，以及在Sr3Ir2O7体系中发现了电子负压缩率现象等。因而，空穴掺杂的铱氧化物中是否也具有和电子掺杂的铱氧化物相类似的物理现象，非常值得研究。因此，本项目聚焦空穴掺杂的铱氧化物Sr3Ir2O7体系，利用角分辨光电子能谱对掺杂的莫特绝缘体中的经典物理问题以及奇异量子现象进行深入的研究。我们期待以空穴掺杂的铱氧化物为切入点，从多角度认知影响和主导量子态的各自由度之间的相互作用和表现形式，以期建立实验现象的普适性，发掘强关联量子材料的应用前景。

A central theme in condensed matter physics is to unveil and understand the exotic quantum phenomena in doped Mott insulators. Strontium perovskite iridate is a typical spin-orbit coupled Mott insulator, providing a fantastic platform for this research. In high-temperature cuprate superconductors, whether it is doped with electrons or holes, high-temperature superconductivity, pseudogap, charge order, etc. can be achieved, resulting in very similar phase diagrams. In iridate, via doping electrons, Fermi arcs, pseudogap and d-wave instability similar to copper oxides have been found in Sr2IrO4 system, and several exotic quantum states have been identified, such as Negative Electronic Compressibility (NEC) effect in Sr3Ir2O7 system. In this context, whether hole-doped iridate also holds similar quantum phenomena to electron-doped system is worth investigating. Here, we propose to study hole-doped Sr3Ir2O7 focus on classic physics topics and exotic quantum phenomena in doped Mott insulator via high-resolution angle-resolved photoemission spectroscopy (ARPES). By using hole-doped iridate as the starting point, we look forward to recognizing interactions and manifestations between the respective degrees of freedom affecting and dominating quantum states from multiple perspectives, establishing the universality of experimental phenomena and exploring the potential application prospects of strongly correlated quantum materials.