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                          澳门皇冠

                          學術活動

                          澳门皇冠:Emergent topology and symmetry-breaking order in correlated quench dynamics

                          來源:  發佈時間:2019-04-15 15:41:14 點擊次數:

                          報告題目:Emergent topology and symmetry-breaking order in correlated quench dynamics

                          報告人:   劉雄軍 教授(北京大學)

                          報告時間:2019418日(週四)上午1000

                          報告地點: 物理學院新樓502會議室


                          報告摘要:


                                Quenching a quantum system involves three basic ingredients: the initial phase, the post-quench target phase, and the non-equilibrium dynamics which carries the information of the former two. In this talk I will introduce how to identify both the topology and symmetry-breaking order in a correlated system, the Haldane-Hubbard model, from quantum dynamics induced by quenching an initial magnetic phase to topologically nontrivial regime. The equation of motion for the complex pseudospin dynamics is obtained through the flow equation method, with the pseudospin evolution shown to obey a microscopic Landau-Lifshitz-Gilbert equation. We find that, with the particle-particle interaction playing crucial roles, the correlated quench dynamics exhibit robust universal behaviors on the band-inversion surfaces (BISs), from which the nontrivial topology and magnetic orders can be extracted. In particular, the topology of the post-quench regime can be characterized by an emergent dynamical topological pattern of quench dynamics on BISs, which is robust against dephasing and heating induced by interactions; the pre-quench symmetry-breaking orders can be read out from a universal scaling behavior of the quench dynamics emerging on the BIS. These results may show insights into the exploration of novel correlation physics with nontrivial topology by quench dynamics.


                          報告人簡介:

                          劉雄軍教授2011年博士畢業於美國德州A&M大學物理系aaa。20112014年分別在美國馬里蘭大學凝聚態物理中心和聯合量子研究所aaa,香港科大高等研究院和麻省理工學院從事博士後研究aaaa。他於20149月加入北京大學量子材料科學中心任研究員aaa,入選國家青年千人aaa。20187月獲得終身長聘職位aaaa,同年8月獲得國家傑青資助aaa,次年1月晉升爲終身長聘正教授aaaaa。劉雄軍教授長期在拓撲物相和超冷原子量子模擬領域開展研究aaa。他在人工規範場量子模擬aaaaa,拓撲超導領域做出系列原創工作aaa;尤其推動近些年人工自旋軌道耦合、拓撲量子模擬方向的理論和實驗發展aaaaa。研究工作多以通訊作者或一作發表在Scienceaaaaa,Science子刊aaaa,Nature子刊aaaa,PRLaaaaa,PRX等期刊上aaaaa。他目前的主要研究興趣集中在拓撲超導aaa,人工規範場量子模擬aaaaa,非平衡拓撲量子系統aaa,強關聯拓撲物相等方面aaaaa。



                          邀請人: 張文獻


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