报告时间：7月6日 周四 上午10:00
报告人：叶锦武教授(Mississippi State university & 首都师范大学)
报告题目： Quantum magnetisms in disordered or spin-orbit coupled systems
In this colloquium, we review recent worldwide experimental advances to generate various kinds of spin-orbital couplings (SOC) in cold atom systems in an optical lattice and also experiments on spin-orbital coupled materials in 4d or 5d transition metal oxides. After a brief introduction to magnetisms in quantum Ferromagnetic Heisenberg and anti-ferromagnetic Heisenberg model, we will discuss quantum Random Heisenberg model whose simplified version called Sachdev-Ye-Kitaev ( SYK) model can stimulate quantum chaos and quantum information propagations in a black-hole through AdS_2/CFT_1 correspondence. The impacts of SYK on 2d quantum gravity and Liouville Conformal field theory are stressed. After briefly reviewing anti-ferromagnetic Heisenberg model in a geometrically frustrated lattice and a spin-bond correlated quantum spin model called Kitaev model, we will discuss quantum Ferro- and Anti-ferromagnet Heisenberg model subject to Spin-orbit couplings which host In-commensurate non-coplanar Skyrmion crystal phases, devil staircases, Cantor sets and multi-fractals. Implications on current or near future cold atom systems and on 4d or 5d transition metal oxides will be discussed.