Coherent current correlations in a double-dot Cooper pair splitter
- URL: http://arxiv.org/abs/2110.11134v1
- Date: Thu, 21 Oct 2021 13:32:47 GMT
- Title: Coherent current correlations in a double-dot Cooper pair splitter
- Authors: Bogdan R. Bu{\l}ka
- Abstract summary: The studies are focused on the noise power spectrum in a whole bias voltage range.
In particular, in the large voltage limit shot noise dominates and its spectrum exhibits two extraordinary side dips related to resonant inter-level current correlations.
In the linear response limit we derived the frequency dependent admittance which shows different interference patterns for the cross and the auto current correlations.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Exact analytical formulas are derived, by means of Keldysh Green functions,
for currents and current correlation functions in a Cooper pair splitter
modelled on a double quantum dot system coherently coupled to a superconductor
and two normal metallic electrodes. Confining to the subspace with the
inter-dot singlet we show perfect entanglement of split electrons in two
separated crossed Andreev reflection processes. The studies are focused on the
noise power spectrum in a whole bias voltage range. In particular, in the large
voltage limit shot noise dominates and its spectrum exhibits two extraordinary
side dips related to resonant inter-level current correlations caused by
coherent electron-hole recombination processes accompanied by emission and
absorption of photons. In the linear response limit we derived the frequency
dependent admittance which shows different interference patterns for the cross
and the auto current correlations.
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