KFKI MFA Budapest
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These results were presented in the IWEPNM2001
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|Model system used in the calculation. The carbon nanotube is modeled by a cylinder of 0.5 nm radius floating above the support plane at a distance of 0.335 nm. The STM tip is taken as a hyperboloid of 0.5 nm apex radius. The tip/nanotube tunnel gap is 0.4093 nm.|
|Initial Gaussian wave packet, spherical symmetric density clipped at the upper boundary of the presentation box.||Wave packet begins to enter into the tip apex region.||Wave packet enters into the tip-nanotube interface. The part reflected back into the tip bulk forms interference patterns with the incoming wave (disc like structures at tip bulk).|
|Wave packet flows around the tube and simultaneously tunnels through it. The incoming and outgoing waves form interferences in the tip apex region.||Wave packet tunnels through the nanotube-support junction and begins to enter into the support. The two wave packet parts (one moving on the left and another on the right side of the tube) meet at the lowest point, standing wave patterns begin to form along the tube circumference. The probability density is gradually spreading along the tube axis.||Nanotube-support tunnel channel begins to open.|
Snapshots of the probability density of the wave packet approaching
the STM junction from the tip bulk and tunneling through the nanotube into
(Click on each image to see a larger version!)
surface is clipped at the presentation box boundaries. The color scaled
insets are X-Z (perpendicular to the tube) and Y-Z (along the tube) plane
cuts of the density.
|This GIF animation (size 1.5 M) shows the time development of a constant
probability density surface clipped at the presentation box boundaries.
Click here to see larger version in MPEG format (size 1.4 M).
Click here to see larger version in DivX AVI (MPEG-4) format (size 4.2 M). The driver is available here.
Simulation of STM images of 3D surfaces and comparison with experimental data: carbon nanotubes;
Phys.Rev.B 58, 12645(1998)
Simulation of scanning tunneling spectroscopy of supported carbon nanotubes;
Phys.Rev.B 62, 2797(2000)