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Related Experiment Videos

Noise-induced pattern formation in a semiconductor nanostructure.

G Stegemann1, A G Balanov, E Schöll

  • 1Institut für Theoretische Physik, Technische Universität Berlin, D-10623 Berlin, Germany.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 9, 2005
PubMed
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Noise influences semiconductor nanostructure dynamics. Weak noise creates coherent oscillations, while stronger noise increases spatial homogeneity but reduces temporal correlation in current density patterns.

Area of Science:

  • Condensed Matter Physics
  • Semiconductor Nanostructures
  • Nonlinear Dynamics

Background:

  • Semiconductor nanostructures, like double barrier resonant tunneling diodes, exhibit complex dynamics.
  • Understanding the role of noise in these systems is crucial for device performance and stability.
  • The system studied operates below the Hopf bifurcation, leading to a stable, spatially inhomogeneous steady state.

Purpose of the Study:

  • To investigate the impact of Gaussian white noise on the current density distribution dynamics.
  • To analyze how noise intensity affects spatial and temporal coherence in a semiconductor nanostructure model.

Main Methods:

  • Modeling a double barrier resonant tunneling diode.
  • Introducing weak Gaussian white noise to the system.

Related Experiment Videos

  • Analyzing the resulting current density distribution and its spatio-temporal correlations.

    • Main Results:

    • Weak noise induces spatially inhomogeneous, coherent oscillations in the current density.
    • Increasing noise intensity leads to more spatially homogeneous oscillations.
    • Noise reduces temporal correlation while simultaneously enhancing spatial coherence of the current density pattern.

    Conclusions:

    • Noise has a dual effect on semiconductor nanostructure dynamics: it can both disrupt and organize behavior.
    • The study reveals a trade-off between temporal and spatial coherence influenced by noise intensity.
    • Findings offer insights into noise-induced pattern formation and coherence in nanoscale electronic devices.