Crossover from diffusive to quasi-ballistic transport

Journal of Applied Physics

Volumn 101, Issue 3, 2007, Pages

  Csontos, Dan ^a   Ulloa, Sergio E ^a  

^a OHIO UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

MAXWELL-BOLTZMANN DISTRIBUTION FUNCTION; QUASI-BALLISTIC REGIMES; SPATIAL DEPENDENCE;

CARRIER CONCENTRATION; ELECTRIC FIELDS; SEMICONDUCTOR DEVICES; VOLTAGE CONTROL;

CHARGE TRANSFER;

EID: 33847222536     PISSN: 00218979     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.2434012     Document Type: Article

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40. We assume that the electron distribution function can be decoupled into two equilibrium distribution functions in the y and z directions of motion and one distribution function describing the electron motion in the x direction where the electric field drives the electrons far from equilibrium.
41. We note that, alternatively, one could also consider studying the channel resistance as a function of channel length in order to investigate the regime of transport. However, in our calculations, we have seen that the resistance in the quasi-ballistic regime of transport depends on the channel length, albeit in a nonlinear fashion, and that the transition between the diffusive (linear) and the quasi-ballistic (nonlinear) regime of transport is difficult to determine. The potential drop, on the other hand, offers a clear signature of that transition.