I am interested in learning more about Klein's paradox. My QM book said you need QFT to treat it properly. I did a quick internet search but found no expository materials. Even Wikipedia had no mention. This forum had very little of substance that I could find on the subject.
Maybe someone can...
Thanks James - I really appreciate your effort. I will read through your answer carefully. I posted a similar question under linear algebra but didn't get a serious
answer.
What prompted this was the fact that
1 0 0 1
0 1 -1 0
work like complex numbers so I wondered what the whole...
NateTG,
0 is just
0 0
0 0
and + is just matrix addition and x is just matrix multiplication.
I found some stupid wikipedia thing where these 4 were given names like
K0 K1 K2 K3 but no references were given so that was a dead end.
I'm at work so I can't look it up in my books.
Thanks, NateTG, for taking the time to respond. That is what I thought until I realized that it had to be a RING for closure. So then I thought I would like to know the NAME of it, at least.
This set of four matrices:
1 0 | 0 1 | -1 0 | 0 1
0 1 | 1 0 | 0 1 | -1 0
are closed under multiplication. What is it called? I know that it is not
those silly quaternions
When people discuss the Lorentz transformation, the start talking about "groups " of transformations SL(2,C), SO(1,3) etc.
Looks impressive! Where can I learn this stuff too?
I asked a similar question in the Linear Algebra section but it gets less traffic
Hi
I am new to solid state. I just read about fermi gas in a cube. For some reason the author used periodic boundary conditions? Why didn't they choose finite well potential where the height of the well is related to the work function?
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!" ;)
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!
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.
Well I am just learning this stuff and it's pretty clear that there is a lot of obfuscation going on. So I am taking very small bites.
I can definitely visualize a linear transformation. Maps a vector to another vector. Period.
Hmm. I take it you've never read David Hume.
Anyways, I thought a little about this on my lunch break. I came up with "a
linear combination of linear combinations". Doesn't seem like a concept worth worrying about.
Hello Gals,
I know what a scalar is.
I know what a vector is.
I know what a linear transformation is.
But what in the name of sweet aunt petunia is a rank 3 tensor?
Love,
Plx Mny