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Eliminating Quantum Phase Slips in Superconducting Nanowires.

Jan Nicolas Voss1, Yannick Schön1, Micha Wildermuth1

  • 1Physikalisches Institut, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany.

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|February 17, 2021
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Summary

Researchers studied superconducting nanowires to understand quantum fluctuations. They developed a novel electromigration technique to precisely control resistance, enabling detailed observation of quantum phase slips and their impact on electronic conduction.

Keywords:
Josephson weak linksgranular aluminumnanowiresquantum phase slipsresistance tuning

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Area of Science:

  • Condensed Matter Physics
  • Quantum Phenomena
  • Materials Science

Background:

  • Quantum fluctuations significantly impact electronic conduction in low-dimensional systems, even at low temperatures.
  • Superconductors are sensitive probes of these fluctuations due to strong interactions with their coherent electron states.

Purpose of the Study:

  • To investigate superconducting nanowires within the quantum phase slip regime.
  • To develop and apply a method for precise control of nanowire resistance and quantum phase slips.

Main Methods:

  • Utilized an intrinsic electromigration process for in situ resistance reduction of superconducting nanowires.
  • Systematically eliminated quantum phase slips in small, consecutive steps.
  • Performed comprehensive measurements of critical (Coulomb) blockade voltages and superconducting critical currents.

Main Results:

  • Observed critical blockade voltages and superconducting critical currents consistent with theoretical models.
  • Identified a continuous transition with nonlinear, metallic-like behavior between the blockade and critical current regimes.
  • Demonstrated that the electromigration technique effectively modifies resistance over three orders of magnitude, applicable even at room temperature.

Conclusions:

  • The intrinsic electromigration technique offers precise control over quantum phase slips in superconducting nanowires.
  • This method facilitates detailed studies of quantum fluctuation effects in reduced dimensions.
  • The resistance-tuning capability has potential applications beyond superconducting quantum circuits, including conventional electronic circuits.