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Pairing transition in a double layer with interlayer Coulomb repulsion

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1912.13257.pdf
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Citation

Sinner, A., Lozovik, Y. E., & Ziegler, K. (2020). Pairing transition in a double layer with interlayer Coulomb repulsion. Physical Review Research, 2(3): 033085. doi:10.1103/PhysRevResearch.2.033085.


Cite as: http://hdl.handle.net/21.11116/0000-0009-2E2F-1
Abstract
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.