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學術活動
重慶大學張學鋒研究員講座通知
發布人:王燚??發布時間:2019-07-03?? 瀏覽次數:23

應物理學院應濤老師邀請,重慶大學張學鋒研究員近日來我校進行講學活動,歡迎校內師生參加。

 目:Frustrated optical lattice: from topological excitations to deconfined phase transition

時間:2019年7月11日(周四)09:30

地點:理學樓308

講學內容:

We analyzed the repulsive particles in the frustrated optical lattice. For the triangular lattice, we find two co-order exist phases: supersolid [1] and ordered metals [2]. Both behave like fluid but also keep crystal structure. After introducing the spatial anisotropy, the bosonic domain walls are excited. Such topological defects can continuously change the crystal structure, so that the exotic incommensurate supersolid is observed [3].

Similar phenomena can also be found in the kagome optical lattice. When choosing cylindrical boundary condition, we found a novel edge liquid phase with fractional charges (spinons) linked by quantum strings (effective gauge field) [4]. In the strong coupling limit, we obtained the effective lattice gauge field theory which shows easy-plane NCCP1 form. And it hints the phase transition from valence bond solid to superfluid can be continuous one which is beyond Ginzburg-Landau symmetry breaking diagram. Recently, such topological phase transition is verified by utilizing large scale quantum Monte Carlo simulations [5].

[1] X.-F. Zhang, R. Dillenschneider, Y. Yu, and S. Eggert, Phys. Rev. B 84, 174515 (2011)

[2] L.-F. Tocchio, C. Gros, X.-F. Zhang, and S. Eggert, Phys. Rev. Lett. 113, 246405 (2014)

[3] X.-F. Zhang, S.-J. Hu, A. Pelster, and S. Eggert, Phys. Rev. Lett. 117, 193201 (2016)

[4] X.-F. Zhang and S. Eggert, Phys. Rev. Lett. 111, 147201 (2013)

[5] X.-F. Zhang, Y.-C. He, S. Eggert, R. Moessner, and F. Pollmann, Phys. Rev. Lett. 120, 115702 (2018)

報告人簡介:

張學鋒博士于2006年山西大學物理基地班學士畢業,2011年在中科院理論物理所獲得博士學位,之后先后在德國凱澤斯勞騰理工大學,馬克斯普朗克復雜系統物理所從事博士后研究。2017年入選重慶大學“百人計劃”。主要通過量子蒙特卡洛數值模擬方法研究阻挫強關聯系統中的新奇量子相,以及相關的拓撲激發與拓撲相變。

歡迎各位老師同學參加。


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