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Quantum Interference and Nonequilibrium Josephson Currents in Molecular Andreev Interferometers.

Noel L Plaszkó1, Peter Rakyta1, József Cserti1

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Quantum interference in polyaromatic hydrocarbon (PAH) Andreev interferometers reveals unique charge distributions and current-phase relationships. This study explores non-equilibrium effects, offering insights into Cooper pair splitting for potential entangled electron generation.

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Cooper pair splittingmolecular electronicsquantum interferencesuperconductivity

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Area of Science:

  • Condensed Matter Physics
  • Quantum Phenomena
  • Materials Science

Background:

  • Andreev interferometers are crucial for studying quantum interference (QI) effects.
  • Polyaromatic hydrocarbons (PAHs) offer a novel platform for these devices.
  • Non-equilibrium conditions are essential for observing unique quantum phenomena.

Purpose of the Study:

  • To investigate quantum interference (QI) effects in three-terminal Andreev interferometers based on PAHs.
  • To analyze the impact of non-equilibrium conditions on charge distribution and current-phase relations.
  • To explore the potential for Cooper pair splitting and entangled electron generation.

Main Methods:

  • Theoretical calculation of currents in normal and superconducting terminals.
  • Analysis of quantum interference effects within PAH cores.
  • Investigation of bias voltage effects on Andreev Bound States (ABSs).

Main Results:

  • Observed peculiar dependence of normal current on superconducting phase difference due to QI in PAHs.
  • Demonstrated that non-equilibrium charge occupation induces asymmetry in electron-hole quasiparticle distribution.
  • Showcased a π transition in the supercurrent's current-phase relation under sufficient bias voltage.

Conclusions:

  • Quantum interference in PAH-based Andreev interferometers leads to novel charge distributions and current-phase behaviors.
  • The induced asymmetry in quasiparticle distribution can be leveraged for Cooper pair splitting.
  • These findings pave the way for generating entangled electrons in future quantum devices.