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Published on: August 2, 2019
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Characterization of anomalous pair currents in Josephson junction networks
I Ottaviani1, M Lucci, R Menditto
1MINAS-Dipartimento di Fisica, Università di Roma Tor Vergata, I-00173 Roma, Italy.
Summary
Superconductive networks exhibit large currents due to Cooper pair hopping via Josephson junctions. This phenomenon is linked to Bose-Einstein condensation, causing uneven Cooper pair distribution in the network.
Area of Science:
- Condensed matter physics
- Quantum phenomena
Background:
- Superconductive networks are crucial for quantum computing and electronics.
- Understanding charge transport mechanisms in these networks is essential.
Purpose of the Study:
- To investigate the origin of anomalously large currents in planar graph-shaped superconductive networks.
- To explore the role of Cooper pair dynamics and Bose-Einstein condensation in these systems.
Main Methods:
- Experimental measurements of currents in superconductive networks under specific biasing conditions.
- Analysis of temperature dependences of observed currents.
- Comparison with theoretical models predicting Cooper pair distribution.
Main Results:
- Anomalously large currents were observed in specific branches of the networks when biased.
- Temperature dependence confirmed Cooper pair hopping through Josephson junctions as the source.
- Experimental data align with theoretical predictions of inhomogeneous Cooper pair distribution.
Conclusions:
- Cooper pair hopping across Josephson junctions drives large currents in these superconductive networks.
- Bose-Einstein condensation is proposed as the underlying mechanism for inhomogeneous Cooper pair distribution.
- Findings offer insights into quantum transport in complex superconducting systems.
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