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Dynamics of wave packets in two-dimensional random systems with anisotropic disorder
Gregory Samelsohn1, Eugene Gruzdev
1Department of Communication Engineering, Holon Institute of Technology, Holon 58102, Israel. samelsohn@hit.ac.il
A new theoretical model explains pulse propagation in disordered 2D systems. Fast wave propagation occurs across the structure due to tunneling, while slower motion is observed along it.
Area of Science:
- Condensed matter physics
- Wave propagation in disordered media
Background:
- Understanding wave dynamics in complex media is crucial for various physical phenomena.
- Disordered systems present unique challenges for wave localization and transport.
Purpose of the Study:
- To develop a theoretical model for narrowband pulse dynamics in 2D systems with correlated disorder.
- To investigate anisotropic systems with cigarlike inhomogeneities and their effect on wave propagation.
Main Methods:
- Theoretical modeling of pulse dynamics.
- Numerical simulations of ultra-wide-band pulse evolution.
- Spectral analysis of wave behavior.
Main Results:
- Predicted fast propagation across anisotropic structures due to evanescent mode tunneling.
- Observed slower wave energy motion along the waveguide-like direction.
- Numerical simulations confirmed predominant diffusion along the major axis of the correlation ellipse.
- Spectral analysis revealed long-living resonant modes contributing to wave tails.
Conclusions:
- The proposed model accurately describes pulse dynamics in disordered 2D systems.
- Anisotropic disorder significantly influences wave propagation direction and speed.
- Evanescent mode tunneling and resonant modes are key mechanisms governing wave transport in these systems.
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