[Seminars] FW: [theory-seminar] KADANOFF CENTER FOR THEORETICAL PHYSICS SEMINAR MONDAY

[Ramona Echols]

[Inline image 2]



KADANOFF CENTER FOR THEORETICAL PHYSICS SEMINAR MONDAY
DATE: Monday October 25th, 2021

TIME: 1:30 P.M.

LOCATION: VIA ZOOM

SPEAKER: Liujun Zou - Perimeter Institute
Title: "Stiefel liquids: possible non-Lagrangian quantum criticality from intertwined orders."
Abstract:  I will propose a new type of exotic quantum critical liquids, Stiefel liquids, based on 2+1 D Wess-Zumino-Witten sigma models on target space SO(N)/SO(4). 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, I will argue that Stiefel liquids with N>6 are non-Lagrangian, in the sense that they cannot be described by any renormalizable continuum Lagrangian. Such non-Lagrangian states are beyond the paradigm of parton gauge mean-field theory familiar in the study of exotic quantum liquids in condensed matter physics. The intrinsic absence of any mean-field construction also means that, within the traditional approaches, it is difficult to decide whether a non-Lagrangian state can emerge from a specific UV system (such as a lattice spin system). For this purpose we hypothesize that a quantum state is emergible from a lattice system if its quantum anomalies match with the constraints from the (generalized) Lieb-Schultz-Mattis theorems. Based on this hypothesis, we find that some of the non-Lagrangian Stiefel liquids can indeed be realized 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.

Upcoming In Person and Zoom Talks:
Particle Theory Seminar: (VIA ZOOM) Juan Criado, Durham University, Seminar Date, October 27th, 1:30PM, Title: "Electroweak skyrmions in the HEFT."
Kadanoff Seminar: (VIA ZOOM) Luckasz Fidkowski, University of Washington, Seminar Date, November 1st, Title: "Gravitational anomaly of 3 + 1 dimensional Z2 toric code with fermionic charges and fermionic loop self-statistics"
Kadanoff Seminar: Yifan Wang, New York University, Seminar Date, November 8th, 1:30PM, Title: "TBA"
Particle Theory Seminar: James Halverson, Northwestern, Seminar Date, November 10th, 1:30PM, Title: "TBA"
Kadanoff Seminar: (VIA ZOOM) Shota Komatsu, CERN, Seminar Date, November 15th, 1:30PM, Title: "TBA"
Particle Theory Seminar: Djodje Radicevic, Brandeis University, Seminar Date, November 17th, 1:30PM, Title: " An Introduction to The Lattice-Continuum Correspondence"
Kadanoff Seminar: Daniel Jafferid , Harvard University, Seminar Date, November 22nd, 1:30PM, Title: "TBA"
Kadanoff Seminar: Victor Gorbenko, Stanford University, Seminar Date, December 6th, Title: "TBA"
Particle Theory Seminar: (VIA ZOOM) Keith Dienes, Arizona University, Seminar Date, December 8th, Title: "TBA"
Particle Theory Seminar: Alessandro  Sfondrini, IAS, Seminar Date, January  12th, Title: "TBA"

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