1. Jun 12, 2007

### plxmny

Hi Y'all,

I would like to demonstrate electron tunneling in my Modern Physics lab class.

Does anyone know of how to set such an experiment up?

We have a lot of equipment and $available, so that's not a problem. I don't want to ask the prof beforehand because he's kinda dumb. 2. Jun 12, 2007 ### AlexHT I can't think of anything that would be all flashy since this is higly microscopic. You could do it with a zerner diode. 3. Jun 12, 2007 ### berkeman ### Staff: Mentor You might consider doing "microwave tunneling" instead: http://it.stlawu.edu/~koon/classes/221.222/222L/Tunnel.html You can google microwave tunneling to get more hits and info. As for electron tunneling, I think you'd need to have access to at least a basic (small) semiconductor fabrication lab in order to make something for a demo. Does your school have an experimental fab? 4. Jun 12, 2007 ### plxmny Thank you very much for both of your replies. I have seen the "photon tunneling on your kitchen table". Someone else is doing that. Yes, we have access to a semiconductor fabrication lab! Just tell me what you have in mind and I can get it rolling! 5. Jun 12, 2007 ### berkeman ### Staff: Mentor Quiz question -- what common electronic components use electron tunelling in their funtion? (and which would be the simplest to fab?) 6. Jun 12, 2007 ### plxmny The average answer seems to be "tunneling diode" but it is difficult to see how one could demonstrate tunneling with such a device - other than to point at it and say "there's tunnelin' in that thar device!" ;) 7. Jun 12, 2007 ### RandallB A Mosfet can have electron tunelling but I think it was a bad thing that needed to be minimized. 8. Jun 12, 2007 ### Creator Do you have an oscilloscope? Build a Scanning Tunnelling Microscope. Here's how to do it for 100 bucks....well, OK,$150. (Yes, you can create atomic images....)

http://www.geocities.com/spm_stm/Project.html

Creator

Last edited: Jun 12, 2007
9. Jun 12, 2007

### Staff: Mentor

....except in at least one very important application in electronics...

If you could tunnel charge onto, say, a floating gate of a MOSFET, what practical use could that be.... ?

10. Jun 12, 2007

### plxmny

Thanks, Creator - I will definitely check that out! I appreciate your help!

(Amazing how many non-answers I get on these silly forums)