J. Hofer, J. Karpinski, et al.
Physica C: Superconductivity and its Applications
We present data obtained on a set of symmetric GaAs/AlGaAs double-barrier quantum-well structures in which the thickness of the AlGaAs barriers has been systematically varied from 31 to 7.5 nm. Low-temperature I(V) characteristics, temperature dependencies, and magnetotunneling have been investigated. Our data suggest a dominance of sequential tunneling processes in the range investigated and point to interface roughness in the well as the possible cause for the large valley currents. Our best devices exhibit a current peak-to-valley ratio of about 20.
J. Hofer, J. Karpinski, et al.
Physica C: Superconductivity and its Applications
P. Guéret, P. Buchmann, et al.
Applied Physics Letters
C. Rossel, U. Kaufmann, et al.
Physica C: Superconductivity and its applications
H. Schwer, E.M. Kopnin, et al.
Physica C: Superconductivity and its Applications