Joint ICTP/SISSA Condensed Matter Seminar, 13 May 2026 10:00hrs, Julien Vidal

[CMSP Seminars Secretariat]

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  Joint ICTP/SISSA Condensed Matter Seminar
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* * * Wednesday, 13 May 2026, 10:00am (CEST)* * *
Lagrange Lecture Room (Leonardo Building, terrace level)
/Zoom: https://zoom.us/meeting/register/ntq01GCIThS0gA8TB6at3Q/

*Speaker:* Julien Vidal (Sorbonne Université)

*Title:* String-nets at finite temperature

*Abstract:*
The string-net model introduced by M. Levin and X.-G. Wen in 2005 allows 
one to generate all possible (bosonic) topological achiral phases in two 
dimensions. In this talk, I will explain how to compute the exact 
partition function of this model and discuss the finite-temperature 
properties of several quantities such as the Wilson loops or the 
topological mutual information. These results show that, in this 
context, topological order can only survive up to a temperature which 
depends on the system size and goes to zero in the thermodynamical limit.