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Condensed Matter/Biophysics Seminars
Spring 2021

Condensed Matter/Biophysics Seminars are via Zoom until further notiice
on Mondays @ 4:05 pm to 4:55 pm

Contact: Yasu Takano or Dmitrii Maslov




January 11      

 

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January 18 (No seminar – MLK Jr Day)      

 

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NA

 

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January 25    

 

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Bo Zhen (Univ. of Pennsylvania)

 

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Topological photonics at the nanoscale

 

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Topological photonics has been of great interest due to both fundamental principles and potential applications. In this talk, I will discuss some of our recent results in linear and nonlinear nanophotonic structures, where topological phenomena are achieved. Their applications in photonics integrated circuits and nonlinear optoelectronic devices will also be discussed. 

 

Host

Xiao-Xiao Zhang


February 1   

 

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Yin-Chen He (Perimeter Institute for Theoretical Physics)

 

Title

Stiefel liquids: from the Dirac spin liquid to a new critical spin liquid

 

Abstract

I will talk about a new type of critical quantum liquids, dubbed Stiefel liquids, that can emerge from the intertwinement of symmetry breaking orders. Our theory is based on 2+1 dimensional nonlinear sigma models on target space SO(N)/SO(4), supplemented with Wess-Zumino-Witten terms. We argue that the Stiefel liquids form a class of critical quantum liquids with extraordinary properties, such as large emergent symmetries, a cascade structure, and nontrivial quantum anomalies. We show that the well known deconfined quantum critical point and U(1) Dirac spin liquid are unified as two special examples of Stiefel liquids, with N=5 and N=6, respectively.Furthermore, we conjecture that Stiefel liquids with N>6 are non-Lagrangian, or in other words are beyond any mean-field descriptions including parton constructions. We further predict that the some of the non-Lagragian Stiefel liquids can be realized as a critical spin liquid in frustrated quantum spin systems, for example, on triangular or kagome lattice, through the intertwinement between non-coplanar magnetic orders and valence-bond-solid orders.

 

Host

Yasu Takano


February 8   

 

Speaker

Yi Li (Johns Hopkins Univ.)

 

Title

Topological superconducting and many-body orders in doped semimetals


Abstract

Electrons in a material can synchronize to exhibit collective effects and various ordered states. I will discuss novel superconducting and density wave orders which capture the topology of the gap function rather than that of quasiparticle states only. The nontrivial geometric phases of Cooper pairs and their non-Abelian generalization lead to fundamentally new topological pairing orders.

Host

Yuxuan Wang


February 15      

 

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February 22

 

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March 1 

 

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Jukka Pekola (Aalto Univ., Finland)

 

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Yasu Takano


March 8 


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Wei Xue (UF)

 

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Tarek Saab


March 15      

 

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March 22 

 

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Pinshane Huang (Univ. Illinois Urbana-Champaign)

 

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Kathryn McGill


March 29 

 

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April 5 

 

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April 12 

 

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Serena Bradde (American Physical Society)

 

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Purushottam Dixit


April 19 

 

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