1 research outputs found
Low frequency shot noise in double-barrier resonant-tunneling structures in a strong magnetic field
Low frequency shot noise and dc current profiles for a double-barrier
resonant-tunneling structure (DBRTS) under a strong magnetic field applied
perpendicular to the interfaces have been studied. Both the structures with 3D
and 2D emitter have been considered. The calculations, carried out with the
Keldysh Green's function technique, show strong dependencies of both the
current and noise profiles on the bias voltage and magnetic field. The noise
spectrum appears sensitive to charge accumulation due to barriere capacitances
and both noise and dc-current are extremely sensitive to the Landau levels'
broadening in the emitter electrode and can be used as a powerful tool to
investigate the latter. As an example, two specific shapes of the levels'
broadening have been considered - a semi-elliptic profile resulting from
self-consistent Born approximation, and a Gaussian one resulting from the
lowest order cumulant expansion.Comment: 15 pages Revtex, 8 Postscript figures included. To be published in
Journal of Physics: Condensed matte