# BKT-paired phase in coupled XY models

@inproceedings{Bighin2019BKTpairedPI, title={BKT-paired phase in coupled XY models}, author={G Bighin and Nicol{\`o} Defenu and Istv'an N'andori and Luca Salasnich and Andrea Trombettoni}, year={2019} }

We study the effect of a linear tunneling coupling between 2D systems, each separately exhibiting the topological Berezinskii-Kosterlitz-Thouless (BKT) transition. In the uncoupled limit, there are two phases: one where the 1-body correlation functions are algebraically decaying and the other with exponential decay. When the linear coupling is turned on, a third BKT-paired phase emerges, in which 1-body correlations are exponentially decaying, while 2-body correlation functions exhibit power…

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