2002/05/20 by Guang-Ping He, Shi-Liang Zhu, Z. D. Wang · 1 citation
Engineering · Mathematics · Physics and Astronomy · #Condensed matter physics #Conductance #Conductance quantum #Geometry #Materials science #Mathematics #Microscope #Molecular Junctions and Nanostructures #Optics #Physics #Point (geometry) #Quantum #Quantum and electron transport phenomena #Quantum mechanics #Quantum point contact #Quantum well #Scanning confocal electron microscopy #Scanning electron microscope #Scanning gate microscopy #Scanning ion-conductance microscopy #Surface and Thin Film Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.65.205321
published as Phys. Rev. B 65, 205321 (2002) · 5 pages
openalex publication_date 2002/05/20 · arxiv created 2002/08/27 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 corresponding 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)].