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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Nonequilibrium zero-bias anomaly in disordered metals.

D B Gutman1, Yuval Gefen, A D Mirlin

  • 1Department of Physics, University of Florida, Gainesville, Florida 32611, USA.

Physical Review Letters
|March 21, 2008
PubMed
Summary
This summary is machine-generated.

We extend the theory of the zero-bias anomaly (ZBA) to out-of-equilibrium conditions. Inelastic scattering smooths out the ZBA

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Area of Science:

  • Condensed matter physics
  • Quantum mechanics

Background:

  • The zero-bias anomaly (ZBA) describes a dip in the electrical conductance of materials at zero voltage.
  • Existing theories primarily focus on equilibrium conditions, limiting understanding of ZBA under dynamic states.

Purpose of the Study:

  • To extend the theoretical framework of ZBA to non-equilibrium scenarios.
  • To investigate the influence of inelastic scattering on ZBA under out-of-equilibrium conditions.

Main Methods:

  • Derivation of an effective action to model virtual fluctuations out of equilibrium.
  • Analysis of the tunneling density of states in diffusive metallic films.

Main Results:

  • The theory for ZBA is successfully extended to out-of-equilibrium conditions.
  • A novel effective action accounting for non-equilibrium virtual fluctuations is developed.
  • Real processes of inelastic scattering were found to regularize the singular behavior of the equilibrium ZBA.

Conclusions:

  • The study provides a theoretical foundation for understanding ZBA beyond equilibrium.
  • Inelastic scattering plays a crucial role in modifying ZBA in dynamic systems.
  • This work opens avenues for exploring non-equilibrium phenomena in quantum transport.