Recent content by afrano

Bragg "diffraction" or "reflection" As you read about X-ray (or neutron) diffraction in solids, you come across authors who use the term "Bragg diffraction" and others that use the term "Bragg reflection". Some authors even use both terms in the same edition of the book (Kittel, 5th Ed.,, I...

I am studying a little about QED in a cavity. I don't really understand Vacuum Rabi splitting. The way I see it, it is the effect on a cavity's transmission spectrum of an atom (or quantum dot) inside the cavity. Well, this leads to two questions: 1) why is the cavity's transmission spectrum...

I have just seen a photograph known as a Laue photograph. I am reading about the Laue method of X-ray Diffraction. This method is supposed to be useful for determining the orientation of a crystal, according to Ashcroft. My question is how? Orientation with regards to what? It seems to me...

Thanks Zz. Can you give me a reference where I can see exactly how the second derivative dI/dU relates to the density of states? Thanks.

Hello, folks. Q: How can one measure the density of states of a semiconductor and a conductor? I would imagine you want to measure the charge carrier density and then you can calculate the density of states. If so, what observable(s) can yield the charge carrier density? How can you...

? Actually it's the first question: how can I Prove that the sum of ket-bra of states n is equal to unity? I did look up the chapters on the Messiah book, but there I only found a treatment on why the eigenvalues are non-integers and the states are non-degenerate. I am still not clear...

All the books I read just say that the set of number states (n) forms a complete space. They just say that the sum of all the ket-bra of states n (over all possible n) is equal to unity. I am having trouble proving this. Can anyone direct me to a good proof and/or show me the way?

I am having a hard time visualizing the distance b/w two Miller planes. I found this article that has a brief explanation: http://www.mrl.ucsb.edu/~seshadri/2004_100A/100A_MillerBragg.pdf which derives the common formula for the distance, which can be used for diffraction/crystallography...

Of course! thanks Fredrik

Someone told me that any operator can be decomposed in a Hermitian and Antihermitian part. Is this true? How? By addition?