Conductance of a Quantum Point Contact in the presence of a Scanning Probe Microscope Tip

Details Conductance of a Quantum Point Contact in the presence of a Scanning Probe Microscope Tip Conductance of a Quantum Point Contact in the presence of a Scanning Probe Microscope Tip

2002-08-27

arxiv.org/abs/cond-mat/0208508v1

Phys. Rev. B 65, 205321 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages

Scientific paper

10.1103/PhysRevB.65.205321

Using the recursive Green's function technique, we study the coherent electron conductance of a quantum point contact in the presence of a scanning probe microscope tip. Images of the coherent fringe inside a quantum point contact for different widths are obtained. It is found that the conductance of a specific channel is reduced while other channels are not affected as long as the tip is located at the positions correspending to that channel. Moreover, the coherent fringe is smoothed out by increasing the temperature or the voltage across the device. Our results are consistent with the experiments reported by Topinka et al.[Science 289, 2323 (2000)].

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