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The a.c. Josephson effect without superconductivity.

Benoit Gaury1, Joseph Weston1, Xavier Waintal1

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Researchers predict a mesoscopic Josephson effect in normal conductors. This phenomenon allows a direct-current voltage to generate an oscillating current, potentially creating tunable terahertz signals without a superconducting gap.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Mesoscopic physics

Background:

  • Superconductivity relies on macroscopic wave function coherence, enabling quantum circuits like qubits.
  • The Josephson effect, linking DC voltage to AC signals in superconductors, is crucial for quantum technologies.
  • A gap exists in tunable AC signal generation between 0.1-10 THz, hindering advancements.

Purpose of the Study:

  • To predict and theoretically demonstrate a mesoscopic counterpart to the AC Josephson effect in normal conductors.
  • To explore the potential for generating tunable AC signals in the terahertz frequency range using normal conductors.

Main Methods:

  • Theoretical prediction of a transient regime in electronic interferometers.
  • Analysis of current oscillations in response to applied DC voltage in normal conductors.

Main Results:

  • A universal transient regime exists in electronic interferometers subjected to DC voltage.
  • The current oscillates at a frequency of eVb/h, analogous to the AC Josephson effect.
  • This effect is not limited by a superconducting gap, unlike traditional Josephson effects.

Conclusions:

  • A mesoscopic Josephson effect can occur in normal conductors, offering a new route for AC signal generation.
  • This discovery could enable the creation of tunable AC signals within the 0.1-10 THz range, bridging the terahertz gap.
  • The findings have implications for quantum circuit development and terahertz technology.