CMT seminar, 2:30 pm at room 4138

[Robbins, Eric]

Dear CMT,

                 Please join us for today's seminar at 2:30pm in room 4138 PRB. Our speaker is Roman Couvreur, ENS Paris-Saclay.  Title of the talk is "Entanglement entropy in non-Hermitian critical spin chains".  Abstract is listed below:

Entanglement entropy has proven invaluable to our understanding of quantum criticality.
It is natural to try to extend the concept to "nonunitary quantum mechanics", which has
seen growing interest from areas as diverse as open quantum systems, noninteracting
electronic disordered systems, or nonunitary conformal field theory (CFT). I will discuss
such an extension by focusing on the case of one-dimensional quantum group symmetric
or supergroup symmetric spin chains. The consideration of left and right eigenstates
combined with appropriate definitions of the trace leads to a natural definition of Rényi
entropies in a large variety of models. This definition is interpreted geometrically in terms
of related loop models and calculate the corresponding scaling in the conformal case.
This allows us to distinguish the role of the central charge and effective central charge
in rational minimal models of CFT.

Faculty Host: Ilya Gruzberg, Ph.D.
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