Daniel Bar-Tal and Eran Halperin wrote a lot about it. Daniel Bar-Tal developed the model of the psychological infrastructure based on collective memory, narratives and ethos and following their writing you will be able reaching other stuff and resources as well.
I started exploring this in the following article: https://www.researchgate.net/publication/280796629_Healing_and_reconciliation_after_violent_conflict_the_role_of_memory_in_South_Africa_and_Rwanda?ev=prf_pub
In the bibliography I list some sources that might be helpful to you.
Article Healing and reconciliation after violent conflict: the role ...
Besides these names mentioned above, I would also suggest Marc Howard Ross and Ervin Staub. You can also check the huge literature on reconciliation, transitional justice, and particularly "confronting the past"
La función de la memoria para la comprensión de los conflictos étnicos es una arista poco trabajada, pero muy relevante. Asumir la memoria como una categoría analítica permite dos cosas: por un lado historizar los conflictos a partir de las determinaciones específicas que los determinan en cada momento y en cada lugar: no es lo mismo estudiar el conflicto mapuche en el siglo XIX con respecto a como se ha estado desarrollando ahora en Chile. Por otro lado, permite sustraerse del sesgo racial, y racista, que se le puede adjudicar al concepto de "etnia".
Para una discusión mas detallada de esta mirada, puede consultar la siguiente bibliografía:
Quiroz, Rubén, La razón racial. Clemente Palma y el racismo a fines del siglo XIX, Universidad Científica del Sur, Lima, 2010
Maíz, Ramón. “El Indigenismo Político en América Latina”, Revista de Estudios Políticos (Nueva Época) Núm. 123. Enero-Marzo 2004, pp. 129-174
The EU derives a great deal of legitimacy from its foundational myth of transnational reconciliation. It has consistently championed a consensual approach to traumatic memory reaching from the abyss of the World Wars and the Holocaust to post war peace and prosperity. But the storyline is losing its lustre. All across Europe, populist and nationalist movements are successfully challenging the official EU narrative. They use the heritage of war and violence to push conventional, confrontational notions of collective belonging – with very dangerous consequences. Social cohesion is fraying and ethnic tensions are on the rise. Plus, since most of this happens well within the rules of the democratic process, the EU is watching helplessly, rendered impotent by a sympathetic but unengaging cultural memory (BULL)