Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1997-05-11
Physical Review B 56, 13268 (1997)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
15 Pages, 12 PS-figures
Scientific paper
We report a combined theoretical and experimental study of electrical transport in weakly-coupled doped superlattices. Our calculations exhibit negative differential conductivity at sufficiently high electric fields for all dopings. In low-doped samples the presence of impurity bands modifies the current-voltage characteristics substantially and we find two different current peaks whose relative height is changing with the electron temperature. These findings can explain the observation of different peaks in the current-voltage characteristics with and without external THz irradiation in low-doped samples. From our microscopic transport model we obtain quantitative agreement with the experimental current-voltage characteristics without using any fitting parameters. Both our experimental data and our theory show that absolute negative conductance persists over a wide range of frequencies of the free-electron laser source.
Allen James S.
Jauho Antti-Pekka
Wacker Andreas
Zeuner Stefan
No associations
LandOfFree
Sequential tunneling in doped superlattices: Fingerprints of impurity bands and photon-assisted tunneling does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Sequential tunneling in doped superlattices: Fingerprints of impurity bands and photon-assisted tunneling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sequential tunneling in doped superlattices: Fingerprints of impurity bands and photon-assisted tunneling will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-534245