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Noise-induced quantum transport.

Pulak Kumar Ghosh1, Debashis Barik, Deb Shankar Ray

  • 1Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|May 21, 2005
PubMed
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Quantum transport is influenced by noise and system potential. Quantization enhances current at low temperatures, with effects diminishing at higher temperatures.

Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Nonlinear dynamics

Background:

  • Directed quantum transport is crucial for understanding energy and charge flow.
  • External noise and system nonlinearity significantly impact quantum transport phenomena.
  • The quantum nature of heat baths and system potentials introduces complex behaviors.

Purpose of the Study:

  • To investigate directed quantum transport under exponentially correlated telegraphic noise.
  • To analyze the quantum contributions from both the heat bath and nonlinear periodic potentials.
  • To explore the interplay between quantum diffusion and potential corrections under varying conditions.

Main Methods:

  • Analysis of quantum transport dynamics.
  • Inclusion of quantum effects from heat baths and nonlinear potentials.

Related Experiment Videos

  • Systematic variation of temperature, noise parameters, and asymmetry.

    • Main Results:

    • Quantization generally enhances classical current at low temperatures.
    • The impact of quantization on current becomes negligible at higher temperatures.
    • Detailed analysis of quantum diffusion and potential corrections across different parameter regimes.

    Conclusions:

    • Quantum effects, particularly quantization, play a significant role in directed transport at low temperatures.
    • The observed phenomena could be experimentally realized in superionic conductors subjected to asymmetric electric fields.
    • Understanding these quantum transport dynamics is essential for designing novel quantum devices.