Why would anyone want to build a narrow channel (quantum wire) transistor?

We show that while narrow channel (quantum wire) transistors may hot exhibit higher unity gain frequency or switching speed than wide channel (quantum well) transistors, they may none the less possess vastly improved noise characteristics. Thus, they are desirable if the application calls for maximal signal-to-noise ratio,The reduced noise temperature in quasi-one-dimensional channels is mostly an aftermath of acoustic phonon confinement (which modifies the phonon dispersion relations), rather than carrier confinement. This is very counter-intuitive since acoustic phonon confinement (and the resultant modification of the phonon dispersion relations) also increases carrier, scattering rates by several orders of magnitude. (C) 2000 Academic Press.