Recent content by crazy_photon

No - i disagree. That's misconception that is why so many people think its triviality ask these questions. Bloch wavefunction is (orthonormal) basis function in which electronic state can be represented - in momentum space and yes indeed - its delocalized. However that doesn't mean that a...

the original question asked whether the conduction electrons were localized or delocalized. all the time i have been on this thread i have been thinking about that question (and issues that are around it). now, the corrections that happen on the mesoscopic scale or corrections due to weak...

OK, agree 100%, i guess what triggered my response was the language issue, i would say 'things that are not observable' as opposed to 'things that are not observed'. anyway, i see misunderstood your point based on that (language issue).

sorry to barge in the middle of the discussion, but i also have to say that i don't see your point as well. of course any theory in physics needs measurement to verify its predictions, but once we have such theory i don't see why i can't be describing things 'without looking'. maybe an...

The terminology of scattering versus diffraction (the reason why you get interference after the slit) is explained in a number of texts. i just checked and beginning of chapter 10 in jackson talks about that (i'm sure there are other places). if by 'coherent scattering' you mean 'diffraction'...

YES! and i'ms still standing by every word of it (unless i find out phase shift is negligible). You know what i enjoy (among lots of things in life) is to chat with a smart person, say by the blackboard and reason about things from basic principles, perhaps not knowing exactly the answers...

Thank you jensa! I thought it was only me that saw it that way. Sokrates, i would try to address you to the point that you raised (not the point of the thread which i would still love to discuss)... If you indeed want to talk about tunneling (resonant or not) - I wouldn't call it scattering...

I agree with you on one thing - that it didn't make much sense (at least to me) :) First off, the question wasn't about boundary conditions -- it was about localization versus delocalization. Boundary conditions were sucked into the argument... I don't understand when you say that...

Kubo linear response gives you Ohms law - but there's no quantization in that. Why do you bring up non-equilibrium greens functions? for a linear response? I don't get you, sorry! But, without entering into a pissing match, I just ask you again (i think 3rd time): please answer the...

From reading your post #49: you say (equivalently) that there are Bloch states in the conduction band and hence electron is delocalized. What you probably should say is that available electronic states (in nearly-free electron model) are spanned by the eigen-states (Bloch states) -- and that...

I've been seeing your style of responses and let me try to emulate you a little (just for fun, shall we?). I think you're the one that needs to go back (waaaaay back) and retake the beginning solid state class where things like Ohms Law (direct consequence of Drude model) stems from the...

look up doppler effect, I'm not going to propose solution, because once you learn it for yourself -- I'm sure you'll figure it out in an instant (at least in a classical sense, not accounting the general relativity corrections -- there's not enough info in the problem to use that anyway).

I think because in the 'bulk' of the fluid there's no restoring force except to the compression -- hence longitudinal wave. At the surface because there's an interface, there's a restoring force that can support transverse oscillation to the direction of propagation.

This is the same explanation that i gave in my posts, i.e. kT (thermal quanta) in comparison with energy separation. I can elaborate: for a given size there's energy separation between the modes allowed by the boundary conditions (if size of the solid is very small, then we have to talk...

Well, thank you for sharing all of your insights. Perhaps you can suggest me some books to start from? BTW, i figured you're doing research on nanotubes/nanowires from your earlier posts - can you share your insights as to how the boundary conditions change the problem there? Also, when you...