carriers is: This can be interpreted as a Dirac delta function that is created immediately after the pulse. Holes then start to travel towards the electrode where we detect them. The signal then is Gaussian curve shaped. Parameters μ, D and τ can be obtained from the shape of the signal. where d is the distance drifted in time t0, and δt the pulse width. See also Alternating current Conduction band Convection–diffusion equation Direct current Drift current Free electron model Random walk References External links Applet simulating the Haynes–Shockley experiment Video explaining the original experiment Educational approach to the HS experiment Semiconductors Charge carriers