Itinerant ferromagnetism in repulsively interacting spin-orbit coupled Fermi systems --新葡萄88805官网“博约学术论坛”系列报告
来源: 作者: 发布时间:2015-01-05邀请人:
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时间: 2015-01-05
地点:
主讲人简介:
第58期 (2015年第1期)
Title: Itinerant ferromagnetism in repulsively interacting spin-orbit coupled Fermi systems
报告人:叶锦武 教授 (首都师范大学)
时 间:2015年1月5日(周一)上午10:00;
地 点:3号教学楼423
ABSTRACT
We investigate the itinerant ferromagnetism of repulsively interacting Fermi gases with spin-orbit coupling (SOC). We find that the spin-orbit coupling provides a new and efficient mechanism to realize the itinerant ferromagnetism (FM) which is a long sought state in material science at much weaker repulsive interactions. We present a classification of the symmetries and symmetry breaking of the SOC Hamiltoniian and their exact constraints on the density-spin correlation functions.
In the FM side, the Fermi surfaces acquire a finite momentum and also experience a topological Lifshitz transition, the symmetry breaking leads to one gapped transverse pseudo-Goldstone mode instead of one gapless Goldstone mode. Various experimental probes are discussed.
报告人简历:
叶锦武教授是美国耶鲁大学物理博士,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. 叶锦武主要研究领域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。
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