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Coulomb drag between one-dimensional conductors

Ponomarenko1, Averin

  • 1Department of Physics and Astronomy, SUNY Stony Brook, Stony Brook, New York 11794, USA.

Physical Review Letters
|December 2, 2000
PubMed
Summary

Coulomb drag in interacting electron systems shows ideal drag at high energies due to an energy gap. At low energies, drag is suppressed, revealing Fermi-liquid behavior in conductors.

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Area of Science:

  • Condensed matter physics
  • Quantum transport phenomena

Background:

  • Understanding electron-electron interactions is crucial for novel electronic devices.
  • Coulomb drag quantifies interactions between charge carriers in separate conductors.

Purpose of the Study:

  • To analyze Coulomb drag in finite-length, interacting, one-dimensional conductors.
  • To investigate the impact of strong coupling and finite length on drag effects.

Main Methods:

  • Theoretical analysis of coupled one-dimensional electron systems.
  • Examination of electron density fluctuations and energy gaps.
  • Study of drag behavior at different energy scales and conductor lengths.

Main Results:

  • Strong coupling induces an energy gap (M) in electron density fluctuations.
  • An "ideal" drag regime emerges at high energies (E > gamma) for long conductors (L > v(-)/M).
  • Coherent instanton tunneling suppresses drag at low energies, leading to vanishing zero-temperature transconductance.

Conclusions:

  • The study reveals distinct drag regimes governed by energy gap and tunneling.
  • Observed vanishing transconductance indicates Fermi-liquid behavior at low energies.
  • Results provide insights into electron correlations in mesoscopic systems.

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