The Joint Condensed Matter Seminar (JCMS) series is organised by KTH Royal Insitute of Technology, Nordita, and Stockholm University.
On Monday, May 4th, 2026 from 10:30 to 11:30 we will host a seminar by Rodrigo Arouca from Brazilian Center for Research in Physics (CBPF).
Charge ordering and topology in the interacting non-Hermitian SSH model
In this talk, I will discuss a recent work [1] where we investigate a non-reciprocal version of the non-Hermitian Su-Schrieffer-Heeger model with an extended Hubbard term. Using exact diagonalization, we compute both the charge structure factor and a topological marker to establish its phase diagram for open and periodic boundary conditions. We show that the topological phase can be extended by interactions, what does not happen for the Hermitian version of this model, and we show that the high order exceptional point helps stabilize the charge order phase.
[1] Sebastião dos A. Sousa-Júnior, Pedro B. Melo, Rubem Mondaini, Arnob Kumar Ghosh, and Rodrigo Arouca, in preparation.