CMSA Quantum Matter in Mathematics and Physics: Fracton critical point and Topological phase transition beyond renormalization

CMSA EVENTS

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June 9, 2021 10:30 am - 12:00 pm
via Zoom Video Conferencing
Speaker:

Yizhi You - Princeton University

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.

Zoom: https://harvard.zoom.us/j/977347126