An Introduction to Modeling Neuronal Dynamics - Borgers in python, Single Neuron Models, Mathematical Modeling, Computational Neuroscience, Hodgkin-Huxley Equations, Differential Equations, Brain ...

The Diffusion lenght in semiconductor physic is defined as the lenght at which the concentration of extra carriers (for example injected by electic field pn junction) decreasses e-times (about 63%).