Berezinskii-Kosterlitz-Thouless phases in ultra-thin PbTiO${}_3$/SrTiO${}_3$ superlattices

Fernando Gómez-Ortiz, Pablo García-Fernández, Juan M. López +1

We study the emergence of Berezinskii-Kosterlitz-Thouless (BKT) phases in (PbTiO${}_3$)${}_3$/(SrTiO${}_3$)${}_3$ superlattices by means of second-principles simulations. Beyond a threshol…