Spectroscopy of the Potential Profile in a Ballistic Quantum Constriction
arXiv:cond-mat/9402031 · doi:10.1103/PhysRevB.50.4590
Abstract
We present a theory for the nonlinear current-voltage characteristics of a ballistic quantum constriction. Nonlinear features first develop because of above-barrier reflection from the potential profile, created by impurities in the vicinity of the constriction. The nonlinearity appears on a small voltage scale and makes it possible to determine distances between impurities as well as the magnitude of the impurity potentials.
3 pages, 4 figures (availiable upon request), REVTEX, Applied Physics Report 93-57