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TT: Fachverband Tiefe Temperaturen

TT 40: Focus Session: Recent Progresses in Criticality in the Presence of Boundaries and Defects I (joint session DY/TT)

TT 40.1: Invited Talk

Wednesday, March 20, 2024, 09:30–10:00, A 151

Boundary behavior at classical and quantum phase transitions — •Max Metlitski — Physics Department, MIT, Cambridge, MA, USA

There has been a lot of recent interest in the boundary behaviour of materials. This interest is driven in part by the field of topological states of quantum matter, where exotic protected boundary states are ubiquitous. In this talk, I'll ask: what happens at a boundary of a system, when the bulk goes through a phase transition. While this question was studied in the context of classical statistical mechanics in the 70s and 80s, basic aspects of the boundary phase diagram for the simplest classical phase transitions have been missed until recently. I'll describe progress in this field, as well as some extensions to quantum phase transitions.

Keywords: phase transitions; conformal field theory; boundary critical behaviour