Two classes of organization principle: quantum/topological phase transitions meet complete/in-complete devil staircases and their experimental realizations

by Prof. Jinwu Ye (Mississippi State university)

Thursday 3 Sept 2020, 10:00 → 12:00 Asia/Shanghai

ONLINE

Abstract

There exists many quantum or topological phases in nature. The well known  organization principle of these phases is through various quantum or topological phases transitions between or among these phases. Here, we report they could also be also organized through either complete or in-complete devil staircases. We show that both classes of  organization principle appear in an experimentally accessible system: strongly interacting spinor bosons or fermions  subject to any of the linear combinations of the Rashba and Dresselhaus spin-orbit coupling (SOC) in the space of the two SOC parameters $ ( \alpha, \beta) $ in a square lattice. We argue that there is no third organization principle. Contrasts to quantum spin liquid (QSL) phases with topological orders  due to geometric frustrations and QSL with quantum chaos due to quenched disorders  in Sachdev-Ye-Kitaev (SYK) models are made. Implications on un-conventional magnetic ordered phases detected in the 4d- or 5d-orbital strongly correlated Kitaev materials with SOC and in the current or near future cold atom systems are presented. This talk is pedagogical, should be accessible to any graduate students.

Biography

Speaker:  叶锦武

 

Mississippi State university

 

叶锦武教授是美国耶鲁大学理论物理博士。他现在是美国密西西比州立大学教授. 叶教授主要研究领域是强相互作用的电子, 玻色子, 自旋，光子等的合作现象和量子或拓扑相变理论,
他的研究还涉及超对称性破缺，共形场论和各种量子或拓扑相的量子引力对偶.
His two most recent research directions are on
(1) Topological Phases, phase transitions driven by interactions in various spin-orbit coupled systems.
(2) Quantum chaos and quantum information scramblings in cavity QED systems or in Sachdev-Ye-Kitaev (SYK) models.
      Connections between SYK models and topological phases.

Chair

Prof. Wei Ku

Division

Condensed Matter

Other information

Venue: TDLI Meeting Room 200

Here is the Zoom link if you prefer to join us remotely:

https://zoom.com.cn/j/92869508894

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