Explain the difference between ballistic transport and normal (diffusive) transport in a material. Using the Landauer formula, calculate the conductance of a quantum device in which the conduction take place through three channels, each of which has a transmission coefficient .
In nanoscale materials, charge transport can occur in two distinct regimes: ballistic and diffusive. Ballistic transport occurs when electrons or charge carriers travel through a material without scattering, maintaining their phase coherence over the device length. This typically happens when the device length ____ _____ ____ _______ _____ ______ ______.
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Take .
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and
.
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