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Regular version of the site

Article

Pairing transition in a double layer with interlayer Coulomb repulsion

Physical Review Research. 2020. Vol. 2. No. 3. P. 033085-1-033085-8.
Sinner A., Yurii E. Lozovik, Ziegler K.

We study the effect of interlayer Coulomb interaction in an electronic double layer. Assuming that each of the layers consists of a bipartite lattice, a sufficiently strong interlayer interaction leads to an interlayer pairing of electrons with a staggered order parameter. We show that the correlated pairing state is dual to the excitonic pairing state with a uniform order parameter in an electron-hole double layer. The interlayer pairing of electrons leads to strong current-current correlations between the layers. We also analyze the interlayer conductivity and the fluctuations of the order parameter, which consists of a gapped and a gapless mode.