主讲人：朱鹏昊 博士（俄亥俄州立大学）

题目：Novel Z₂ Quantum Spin Liquid Phases in Kitaev Systems UnderIntermediate Magnetic Fields（在中等磁场下Kitaev系统中的新型Z₂量子自旋液体相）

时间：2024年11月27日（周三）上午10：00

地 点：理工楼1227

腾讯ID：155-481-930 (备用ZOOM: 946 8181 3344 密码：234224）

联系人：陈川

报告摘要：

The exactly solvable Kitaev honeycomb model is foundational in the study of quantum spin liquids (QSLs). Several materials, such as iridates (Na₂IrO₃, α-Li₂IrO₃) and α-RuCl₃, are believed to be close to the Kitaev QSL phase. In experiments, applying external magnetic fields has been shown to potentially induce Kitaev QSL phases in these materials. Therefore, studying the Kitaev honeycomb model under external magnetic fields, where it is no longer exactly solvable, is of both theoretical and experimental significance.

完全可解的Kitaev蜂窝模型是研究量子自旋液体（QSL）的基础模型。一些材料，如铱酸盐（Na₂IrO₃, α-Li₂IrO₃）和α-RuCl₃，被认为接近Kitaev QSL相。在实验中，施加外部磁场已被证明可能在这些材料中诱导出Kitaev QSL相。因此，研究在外部磁场下的Kitaev蜂窝模型（此时模型不再完全可解）具有重要的理论和实验意义。

In this talk, I will discuss a novel quantum spin liquid phase that emerges in the Kitaev honeycomb model under intermediate magnetic fields. I will highlight the dynamical features of fractionalization in this new phase using our high-resolution iPEPS results on spin correlations. Based on these features, I develop a theory that identifies this debated quantum spin liquid phase as a Majorana metal.

在本次报告中，我将讨论一种在中等磁场下Kitaev蜂窝模型中出现的新型量子自旋液相。我将利用我们基于高分辨率iPEPS方法对自旋关联的研究结果，着重介绍这一新相中分数化的动力学特征。基于这些特征，我们发展了一种理论，将这一备受争议的量子自旋液相识别为一种Majorana金属（Majorana metal）。

个人简介：

Penghao Zhu earned his PhD degree from UIUC. His PhD research primarily focused on various aspects of topological crystalline phases, such as entanglement, magnetism, geometric response, nonlinear response, and the bulk-boundary correspondence, in both Hermitian and non-Hermitian systems. As a John Wilkins postdoctoral fellow at OSU, Penghao is current working on topological effects in strongly interacting systems, like quantum spin liquids, SPT, and topological orders.

朱鹏昊博士毕业于伊利诺伊大学厄巴纳-香槟分校（UIUC），他的博士研究主要集中在拓扑晶体相的多个方面，包括纠缠、磁性、几何响应、非线性响应以及厄米和非厄米系统中的体-边对应等。朱鹏昊目前是俄亥俄州立大学的John Wilkins博士后研究员，研究方向为强相互作用系统中的拓扑效应，例如量子自旋液体、对称保护拓扑相（SPT）以及拓扑序。