题目：Itinerant ferromagnetism in repulsively interacting spin-orbit coupled Fermi gas

　　报告人：叶锦武　　首都师范大学长江学者、教授，美国密西西比州立大学教授

　　时间：6月18日（周三），15：00-16：30 

　　地点：李薰楼468室

　　报告简介：　　

　　We investigate the itinerant ferromagnetism of repulsively interacting Fermi gases with spin-orbit coupling (SOC).

　　We find that the SOC provides a new and efficient mechanism to realize the itinerant ferromagnetism (FM) which is a long sought state in material science at relatively weak repulsive interactions. Near the FM transition, the coexistence of two types of spin fluctuations with different dynamic exponents leads to new quantum-classical crossover regimes. In the FM side, the Fermi surfaces acquire a finite momentum and also experience a topological Lifshitz transition driven by the magnetization, the symmetry breaking leads to two gapped transverse pseudo-Goldstone modes instead of gapless Goldstone modes. Various experimental probes of these new phenomena are discussed.

　　报告人简介：叶锦武教授

　　叶锦武教授是清华大学的本科生，之后获得美国耶鲁大学理论物理博士学位，并在美国哈佛大学做过博士后。他现在是首都师范大学长江学者教授和美国密西西比州立大学教授。叶教授主要研究领域是理论物理, 特别是强相互作用的电子，自旋，光子等基本粒子的合作现象和量子相变理论，也喜欢研究中国人民解放军的历史, 特别是开国战神粟裕战略和战术对自然科学的指导作用。