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Coulomb drag at zero temperature.

Alex Levchenko1, Alex Kamenev

  • 1Department of Physics, University of Minnesota, Minneapolis, Minnesota 55455, USA.

Physical Review Letters
|February 1, 2008
PubMed
Summary
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Coulomb drag shows temperature saturation at third-order calculations. This Coulomb drag effect is strongest in low mobility samples, differing from conventional predictions.

Area of Science:

  • Condensed matter physics
  • Quantum mechanics
  • Mesoscopic physics

Background:

  • Coulomb drag measures interlayer interactions in double-layer systems.
  • Conventional theories predict temperature-dependent, mobility-independent transresistance.
  • Third-order calculations reveal deviations from conventional behavior.

Purpose of the Study:

  • Investigate the temperature dependence of Coulomb drag at third-order interlayer interactions.
  • Determine the zero-temperature transresistance and its dependence on sheet conductance.
  • Clarify the role of Coulomb drag as a signature of strongly coupled states.

Main Methods:

  • Perturbative calculation of Coulomb drag to the third order in interlayer interactions.
  • Analysis of the zero-temperature limit of the transresistance.

Related Experiment Videos

  • Comparison with second-order predictions and experimental observations.

    • Main Results:

    • Coulomb drag exhibits saturation at low temperatures for third-order calculations.
    • Zero-temperature transresistance scales as h/(e^2g^3), inversely proportional to conductance cubed.
    • The effect is significantly stronger in low mobility samples.
    • Observed behavior contrasts with temperature-dependent, mobility-independent second-order predictions.

    Conclusions:

    • Third-order effects are crucial for understanding Coulomb drag at low temperatures.
    • The saturation and strong dependence on mobility challenge the interpretation of zero-temperature drag as a sole indicator of strong coupling.
    • Further theoretical and experimental investigations are needed to fully elucidate the complex behavior of Coulomb drag.