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Andreev-Coulomb Drag in Coupled Quantum Dots

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arxiv 2009.12398 v3 pith:ILLX2JOP submitted 2020-09-25 cond-mat.mes-hall cond-mat.supr-con

Andreev-Coulomb Drag in Coupled Quantum Dots

S. Mojtaba Tabatabaei , David Sanchez , Alfredo Levy Yeyati , Rafael Sanchez This is my paper
classification cond-mat.mes-hall cond-mat.supr-con
keywords dragcoulombcoupledcurrenteffectnormalquantumsuperconducting
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The Coulomb drag effect has been observed as a tiny current induced by both electron-hole asymmetry and interactions in normal coupled quantum dot devices. In the present work we show that the effect can be boosted by replacing one of the normal electrodes by a superconducting one. Moreover, we show that at low temperatures and for sufficiently strong coupling to the superconducting lead, the Coulomb drag is dominated by Andreev processes, is robust against details of the system parameters and can be controlled with a single gate voltage. This mechanism can be distinguished from single-particle contributions by a sign inversion of the drag current.

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