Beecroft building

Condensed Matter Theory Forum - Fracton critical point and Topological phase transition beyond renormalization

24 Nov 2021
Seminars and colloquia
Simpkins Lee
Martin Wood Complex, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU

Dr Yizhi You

Seminar series
CMT Forum
Knowledge of physics?
Yes, knowledge of physics required
For more information contact


The theory of quantum phase transitions separating different phases with distinct symmetry patterns at zero temperature is one of the foundations of modern quantum many-body physics. In this talk, I will demonstrate that the existence of a 2D topological phase transition between a higher-order topological insulator (HOTI) and a trivial Mott insulator with the same symmetry eludes this paradigm. A significant new element of our phase transition theory is that the infrared (IR) effective theory is controlled by short wave-length fluctuations so the critical phenomenon is beyond the renormalization perspective.