Author/Authors :
A. Pioda، نويسنده , , D. Brunner، نويسنده , , S. Kicin، نويسنده , , T. Ihn، نويسنده , , A. G. Grishin and M. Sigrist ، نويسنده , , A. Fuhrer، نويسنده , , K. Ensslin، نويسنده , , M. Reinwald، نويسنده , , W. Wegscheider، نويسنده ,
Abstract :
Low-temperature transport experiments on a quantum point contact under the influence of a scanning gate are reported. The scanning gate is the metallic tip of a scanning force microscope operating at a temperature of 300 mK. In particular, the influence of the scanning tip on conductance resonances observed in the gate-characteristics of the point contact is studied. The strongest conductance resonances appear to be related to the local potential within the channel of the point contact. As a consequence, the point contact with its conductance resonances can be used as a sensor for the local tip-induced potential.
