What Devices and Barriers are Used in Quantum Tunneling Experiments?

[forex10]

On pages 23 & 24 of the book Superforce by Paul Davies - The unusual
occurances of electrons or other particles as they approach a barrier
are described.

I would like to know what devices are used in these experiments? What
device shoots out electrons or other particles in a single stream at a
fairly low rate? Also what kind of barriers are used?

It is too bad that Davies did not elaborate further on this or give out
more info. I would guess an electron beam produced by a CRT is too
energetic or intense for these experiments. Hopefully some one can help
out here.

Joel

 

[ZapperZ]

On pages 23 & 24 of the book Superforce by Paul Davies - The unusual
occurances of electrons or other particles as they approach a barrier
are described.

I would like to know what devices are used in these experiments? What
device shoots out electrons or other particles in a single stream at a
fairly low rate? Also what kind of barriers are used?

It is too bad that Davies did not elaborate further on this or give out
more info. I would guess an electron beam produced by a CRT is too
energetic or intense for these experiments. Hopefully some one can help
out here.

Joel

In a scanning tunneling microscope, the material being probe has a very sharp tip hovering just barely above the surface. A potential bias across the tip-sample causes electrons to tunnel across the vacuum gap between these two.

In planar tunnel junction, you make layers of a material separated by a thin, insulating region. Again, charge carriers can tunnel across the barrier than a sufficient potential is applied across the barrier.

etc etc...

Zz.

 

[Entropia]

,

Thank you for your interest in quantum tunneling experiments. The devices used in these experiments vary depending on the specific setup and goals of the experiment. However, some common devices include electron guns, particle accelerators, and scanning tunneling microscopes.

Electron guns are used to produce a beam of electrons with a specific energy and direction. These can be used to shoot out electrons in a single stream at a controlled rate. Particle accelerators, such as the Large Hadron Collider, are also used to produce high-energy particles for quantum tunneling experiments.

As for the barriers used, these can also vary depending on the experiment. In general, any material that can act as a potential barrier for the particles being studied can be used. This could include thin films, semiconductors, or even just a small gap between two conductive plates.

I agree that it would have been helpful for Davies to provide more specific information on the devices and barriers used in these experiments. However, the specific details may not have been relevant to the overall message he was trying to convey in the book.

I hope this helps answer your questions. If you have any further inquiries about quantum tunneling experiments, please don't hesitate to ask. As scientists, we are always happy to share our knowledge and expertise with others.