Physics – Condensed Matter
Scientific paper
1996-02-20
Physics
Condensed Matter
15 pages Revtex, 8 Postscript figures included. To be published in Journal of Physics: Condensed matter
Scientific paper
10.1088/0953-8984/8/17/014
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.
Bo Lund O.
Galperin Yu.
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