Workshop 2025: Interplay between local and non-local frustration in the 1D ANNNI chain

Session Information

Location: Lecture room F3213 - 22
Day: Wednesday, 14 May
Time: 18:00 - 19:00
Chairperson: -

Presentation Details

Presentation Type: Poster presentation
Title: Interplay between local and non-local frustration in the 1D ANNNI chain
Abstract: We explore the interplay between topological frustration (TF), a form of frustration induced by boundary conditions, and a local source of frustration arising from competing interactions within the system, using the 1D ANNNI model. We focus on entanglement entropy (EE) as a measure of quantum correlations. Near the classical point, we observe a violation of the entanglement entropy (EE) area law, with the measure decomposing into two contributions: one independent of TF and another size-dependent contribution arising from TF, suggesting that the ground state hosts two excitations. This is confirmed by considering two fermionic excitations over the vacuum of a quadratic theory. Furthermore, the same behavior is found throughout the entire phase, where we numerically observe that the local and topological contributions to EE decouple.

Presenter

Dr Gianpaolo Torre
Institut Ruđer Bošković | Croatia

Authors

1. Gianpaolo Torre | Institut Ruđer Bošković, 10000 Zagreb, Croatia
2. Alberto Giuseppe Catalano | Università Padova, Via VIII Febbraio, 2, 35122 Padova PD, Italia
3. Sven Benjamin Kožić | Institut Ruđer Bošković, 10000 Zagreb, Croatia
4. Salvatore Marco Giampaolo | Institut Ruđer Bošković, 10000 Zagreb, Croatia
5. Fabio Franchini | Institut Ruđer Bošković, 10000 Zagreb, Croatia