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Luca Chirolli
(University of Florence, Italy) Abstract:
In this work we show how to quantum design Cooper quartets in an interacting double quantum dot system coupled to ordinary superconducting leads. For attractive interactions, a fundamentally novel, maximally correlated double quantum dot ground state, in the form of a superposition of vacuum |0> and four-electron state |4e>, emerges as a narrow resonance in a many-body quartet correlator that is accompanied by negligible pair correlations and features a rich phenomenology. Aiming at an experimentally relevant realization dominated by repulsive interactions, we propose to stabilize quartet correlations by bringing the system out of equilibrium by weakly coupling additional normal leads to the double quantum dot system. The assessment of the currents and current-current correlations reveals peculiar features in the Andreev current and super Poissonian Fano factor that we ascribe to the quartet correlations. The results open the way to the exploration of higher order superconducting correlations in solid state devices.
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CMSP Seminar: Cooper quartets in hybrid superconducting devices
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