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Anomalous quantum transport in a thin film
1Theoretical Condensed Matter Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar Kolkata 700064, India.
Journal of Nanoscience and Nanotechnology
|November 26, 2009
Summary
Electron transport in disordered films shows surprising behavior. Current increases with disorder in strong regimes but decreases in weak regimes, unlike conventional films.
Area of Science:
- Condensed matter physics
- Materials science
- Surface science
Background:
- Understanding electron transport in disordered materials is crucial for electronic devices.
- Conventional disordered films exhibit decreased current with increased disorder.
- Surface effects on electron transport in thin films require further investigation.
Purpose of the Study:
- To numerically study electron transport in a thin film with spatially varying disorder.
- To investigate the impact of disorder strength gradient on current amplitude.
- To compare the behavior of smoothly varying disordered films with conventional disordered films.
Main Methods:
- Utilizing a tight-binding model for electron transport simulation.
- Coupling the thin film to metallic electrodes via Newns-Anderson chemisorption theory.
- Performing numerical simulations to analyze current amplitude variations.
Main Results:
- Observed an increase in current amplitude with disorder strength in the strong disorder regime.
- Observed a decrease in current amplitude with disorder strength in the weak disorder regime.
- Demonstrated behavior opposite to conventional disordered films.
Conclusions:
- Electron transport in smoothly varying disordered films exhibits unique characteristics.
- The gradient of disorder significantly influences electron transport properties.
- Findings challenge conventional understanding and offer new insights for material design.
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