What is meant by ambipolar diffusion?
What is meant by ambipolar diffusion?
Definition. Ambipolar diffusion is the slippage of neutral matter in a plasma with respect to an internal magnetic field. This slippage occurs when the ionization fraction is so low that collisions between neutral species and ions become relatively rare.
What is Ambipolar effect?
Ambipolar diffusion is diffusion of positive and negative species with opposite electrical charge due to their interaction via an electric field. In the case of ionic crystals, the fluxes of the diffusing species are coupled, while in a plasma the various species diffuse at the same rate.
What is magnetic field diffusion?
Magnetic diffusion refers to the motion of magnetic field lines, typically in the presence of a conducting solid or fluid such as a plasma. The motion of magnetic fields is described by the magnetic diffusion equation and is due primarily to induction and diffusion of magnetic fields through the material.
What is ambipolar diffusion coefficient?
We find that the diffusion coefficient is essentially that of the ions multiplied by the ratio of electron and ion temperatures. The diffusivity of the ions will be of similar magnitude to that of neutral molecules. Thus reasonable values of ambipolar diffusivity are 3500 to 7500 cm2/sec at 1 Torr.
What is ambipolar semiconductor?
Definition. ambipolar semiconductor. a material which does not display either n-type, or p-type conductivity. polar semiconductor. doped semiconductor featuring distinct conductivity type: n, or p.
Why is graphene ambipolar?
Positive gate voltage induces electrons while negative voltage induces holes. With its unique ambipolar transport properties and exceptional carrier mobility, graphene is … which cannot be removed at room temperature that sets the fundamental limit of mobility in graphene.
