Publications in Scientific Journals:
M. Kast, C. Pacher, G. Strasser, E. Gornik, W.S.M. Werner:
"Wannier-Stark States in Finite Superlattices";
Physical Review Letters,
Individual Wannier-Stark states are resolved in a current experiment over a wide electric-field range
for a 5 and 4 period finite superlattice utilizing a hot-electron transistor. The observed field dependence
of the tunneling transmission through the various states directly resembles the progressive localization
of the wave functions. The basic transport through Wannier-Stark states in short-period superlattices is
identified to be coherent. By tuning theWannier-Stark state splitting with electric field into the optical
phonon energy, the opening of new LO-phonon mediated transport paths is observed.
DOI: 10.1103/PhysRevLett.89.136803 PACS numbers: 73.21.Cd, 72.80.Ey, 73.23.Ad, 73.40.Gk
Created from the Publication Database of the Vienna University of Technology.