报告摘要："Self-ordering" -- the spontaneous emergence of order out of disorder and chaos under some critical conditions -- is a ubiquitous phenomenon not only in physics, but also in chemistry, biology, social sciences, and many other fields. The most well-known example in physics is the crystallization process, while the other commonly known general examples are the collective bird flocking and fish schooling. In this talk, I will discuss the basic physics of self-ordering in open atom-cavity quantum systems[1]. In these systems, self-ordering is normally accompanied by the so-called "superradiance", which I will also explain. In the end, I will present some of our new predictions for self-ordering and superradiance in atom-cavity systems, which leads to the so-called "rotational superradiance". [1] F Mivehvar, F Piazza, T Donner, H Ritsch,"Cavity QED with quantum gases: New paradigms in many-body physics", Advances in Physics 70 (1), 1-153 (2021).

报告摘要：Supersymmetry (SUSY) proposed as an elementary symmetry for physics beyond the Standard Model has found important applications in various areas outside high-energy physics. In this talk, I will elaborate how to systematically implement supersymmetric quantum mechanics into a wide range of topological gapless systems, where the broken translational symmetry is effectively captured by an SUSY potential. It will also be shown that the dynamical SUSY breaking via the instanton effect over the SUSY potential valleys works as the underlying mechanism for the gap opening of the topological phases, and the magnitude of the instanton effect is proportional to the energy gap. Our theory can be applied to topological gapless quantum systems, leading to previously unexpected results: even an infinitesimal magnetic field can open a gap in topologically robust Dirac, Weyl, and nodal-line semimetal phases due to the dynamical SUSY breaking. Overall, the revealed connection between SUSY quantum mechanics and non-uniform topological gapless systems is able to elucidate previously ambiguous phenomena, provide deep insights for future investigations, and open a new avenue for exploring topological systems.

报告摘要：作为凝聚态物理学研究的一个重要方面，粒子和晶格自由度之间的相互作用是支配许多固体材料结构属性的本质原因。特别对于一维金属，电子-晶格相互作用可以破坏原始的费米面，导致密度波形式的晶格畸变，即Peierls畸变。传统的Peierls理论认为，发生Peierls转变的必要条件是粒子的费米统计属性。只有在一维费米子体系中才可以自然产生两点费米面，而该费米面的完美嵌套一直以来都被认为是Peierls畸变得以产生的直接原因。我们在玻色版本的一维伊辛-近藤晶格模型中发现了所谓“玻色Peierls态”。这里的玻色Peierls态其核心特征是玻色子自旋在实空间中形成的长程自旋密度波序，该密度波的周期由巡游玻色子的密度决定。通过将有限尺度结果外推到热力学极限，我们还得到了不同参数条件下的基态相图。研究发现，除了破缺平移对称性的玻色Peierls态，体系还存在均匀的顺磁态和铁磁态。

岗位介绍：（1）光学和冷原子工程师：负责设计、搭建和优化冷原子实验平台，利用高精度激光、电磁场等技术手段实现对冷原子体系的精确调控。该平台是实现大规模、高精度量子计算、量子模拟以及量子精密测量的核心工具，具有优异的可扩展性和低噪声特性，是推动量子技术实用化的关键方向之一。（2）电子电路和软件工程师：负责设计、开发和维护冷原子实验平台的电子硬件和控制系统。通过与科研团队紧密合作，利用模拟/数字电路、嵌入式硬件和软件技术，提升实验平台的调控能力和系统集成度，推动冷原子实验技术向实用化迈进。

岗位职责：（1）负责科研任务所涉及的专利、学术报告的编写，各类学术总结和汇报的撰写；（2）负责研究院日常事务性工作，各类文稿的编写及文件材料存档等；（3）负责日常财务管理工作；（4）协助完成学术会议的组织工作；（5）研究院交办的其他工作。此招聘岗位性质为二级人事代理，采取劳务派遣方式聘用，薪酬福利按学校、研究院相关规定执行。

本招聘启事长期有效，直至招满为止，凡符合应聘条件者均可报名。招聘条件：1.具有冷原子物理研究背景，有冷原子实验研究经历者优先；2.在相关领域发表过高水平学术论文。