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Quantum Interference and Nonequilibrium Josephson Currents in Molecular Andreev Interferometers
Noel L Plaszkó1, Peter Rakyta1, József Cserti1
1Department of Physics of Complex Systems, Eötvös Loránd University, Pázmány P. s. 1/A, 1095 Budapest, Hungary.
Nanomaterials (Basel, Switzerland)
|June 3, 2020
Summary
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.
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.
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