We report on an investigation of commensurability oscillations in antidot square-lattices, and show that the commensurate peaks in resistivity ρxx derive from two kinds of el ectron: runaway and quasi pinned electrons. The runaway electrons, which skip away along the antidot arrays, increase the value of conductivity σxx; and the quasi pinned electrons, which orbit some antidots for a long time, decrease the value of σxx. Therefore, by competition between the two different types of electron, the conductivity σxx is determined. The conductivity σyx in the antidot lattice always hasdips at the peaks in ρxx. Asa result, by combining the of values of σxx and σyx, the resistivity is determined through the orthodox relation of ρxx = σxx/(σxx2 + σyx2).
- Periodic potential
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Electrical and Electronic Engineering