Spectroscopy of the Potential Profile in a Ballistic Quantum Constriction
I. E. Aronov, M. Jonson, A. M. Zagoskin
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.
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