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Related Experiment Videos

Current cross-correlations in double quantum dot based Cooper pair splitters with ferromagnetic leads.

Kacper Wrześniewski1, Piotr Trocha1, Ireneusz Weymann1

  • 1Faculty of Physics, Adam Mickiewicz University, 61-614 Poznań, Poland.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 6, 2017
PubMed
Summary

This study explores current cross-correlations in a Cooper pair splitter, revealing how positive correlations enhance efficiency and negative ones hinder it. Understanding these correlations is key for optimizing Cooper pair splitting devices.

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Area of Science:

  • Quantum electronics
  • Condensed matter physics
  • Spintronics

Background:

  • Cooper pair splitters are crucial for quantum information processing.
  • Understanding charge transport in hybrid superconducting-ferromagnetic systems is challenging.
  • Current cross-correlations offer insights into electron correlations and entanglement.

Purpose of the Study:

  • To investigate Andreev current cross-correlations in a double quantum dot (DQD) Cooper pair splitter.
  • To analyze the influence of superconducting and ferromagnetic electrodes on transport properties.
  • To determine conditions for efficient Cooper pair splitting based on correlation analysis.

Main Methods:

  • Perturbative real-time diagrammatic technique.
  • Analysis of Andreev transport in linear and nonlinear response regimes.

Related Experiment Videos

  • Modeling a DQD coupled to one superconductor and two ferromagnetic leads.

    • Main Results:

    • Observed both positive and negative Andreev current cross-correlations.
    • Positive correlations indicate high Cooper pair splitting efficiency.
    • Negative correlations suggest detrimental effects on Cooper pair splitting.

    Conclusions:

    • The study provides a detailed insight into Andreev transport properties of the DQD device.
    • Identified mechanisms governing positive and negative current cross-correlations.
    • Findings are crucial for designing and optimizing Cooper pair splitters for quantum technologies.