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

Abstract

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)].

5 pages

References in corpus (2)

• Quantum Transport in Semiconductor Nanostructures
• Conductance of a quantum point contact in the presence of spin-orbit interaction

Cited by in corpus (5)

• Green's function technique for studying electron flow in 2D mesoscopic samples
• What is measured in the scanning gate microscopy of a quantum point contact?
• Wave function mapping conditions in Open Quantum Dots structures
• Single electron charging of impurity sites visualized by scanning gate experiments on a quantum point contact
• Chemical and magnetic impurity effects on electronic properties of semiconductor quantum wires