Spintronics? Control Electron Spin Electrically

Rundmaus

Member
2005-08-21 10:46 pm

Only if you sigificantly accelerate them. Ordinary synchrotron inhabitants at 1.5GeV do.

Electrons in conductors exhibit drift speeds of mm/s or cm/s. Really slow.

Don't mix up electron speed with information speed. The information that you closed the light switch reaches your light bulb nearly with the speed of light. The electrons themselves move sloooowly, but your conductor is full of them.

Rundmaus
 
You mean Bohr got it wrong? An awful lot of introductory science books will need rewriting! :cool:

The interesting thing about this model is that it allows a semi-classical calculation of energy levels to get the right answers for hydrogen, despite the model being wrong. A warning to all 'practical' people: even if it gives the right answers in some situations it doesn't mean it is right.
 

Rundmaus

Member
2005-08-21 10:46 pm
The interesting thing about this model is that it allows a semi-classical calculation of energy levels to get the right answers for hydrogen, despite the model being wrong. A warning to all 'practical' people: even if it gives the right answers in some situations it doesn't mean it is right.

Right!

It works fine if your goal is to calculate hydrogen energy levels. It starts getting awfully wrong if you start looking for small, negatively charged spheres flying around in circles ;)

Rundmaus
 
Jeeze, no need to get quantum on my case:) just trying ti illustrate some figures of the speed of electrons, and how they don't move fast at all...
Don't mix up electron speed with information speed. The information that you closed the light switch reaches your light bulb nearly with the speed of light. The electrons themselves move sloooowly, but your conductor is full of them.
Depends on the dielectric the waves are going through, and thus Er, and in the case of microstrip PCB layout (signals on the top or bottom, not inner layers) its only about half the speed of light or 6"/nS.