Schematic diagram of Wannier-Stark states. Schematic diagram of Wannier-Stark states in a 6H-SiC natural superlattice at a modest uniform electric field. The solid and dotted curves depict the envelope wave functions corresponding to different steps in the ladder. The thick short lines correspond to the electron Wannier-Stark levels confined within the first well (dashed lines).
Sankin et al. Nanoscale Research Letters 2012 7:560 doi:10.1186/1556-276X-7-560