Recent content by Talker1500

Hi, I've been reading about critical exponents and how they're related in any system. I've seen how, for example, several exponents can be extrapolated from charts using a log-log fitting. I would like to know how this procedure works exactly, I know it's a silly question but I've been...

I've had that paper for some time but for some reason I overlooked the last part when I read it.Thank you very much for the answer, this thread can be closed now.

Hi guys, I'm trying to use thermal oxidation with Si wafers in order to get SiO2 to use for electric components. I've been trying to find out how the partial pressure of the gases used (O2 in this case, it's a dry oxidation) affect the oxidation time, but I haven't been able to find an...

Hi, I've been thinking about the following scheme: let's say I have an incoming photon ray with wavefunction ψ1 that finds a bloch electron with wavefunction ψ2. Is there any way to compute the optical coefficients (transmitivity, reflectivity etc) of the material knowing only this two ψ and...

I dont, I'm just asking what would be the experimental setup for this kind of study

Hi, I'm wondering if there's any possible way to do voltage gating to a sample while observing it with a microscope, in order to measure its optical properties while changing its electrical parameters. Thanks

Hi, I'm reading about the equipartition's energy theorem (classical statistics), and I was wondering about its validity when applied to different hamiltonians. The usual case, H=p ^2/2m, it yields 3/2KT in 3D, but what about more complicated H? Like H=|p|c, or a H with a complex V? would...

I asked because I was reading a book a couple days ago (I think it was Blundell's), and there was a question at the end of the chapter "Ferromagnetic and Antiferromagnetic order", that posed that exact question: why is metallic Fe ferromagnetic and metallic Cr antiferromagnetic?. I figured...

Hi, I'm studying para-ferro/antiferro transitions, and I have a doubt: how can I know, starting with the electronic configuration of a given element, if it will have antiferromagnetic o ferromagnetic order? Obviously one has J>0 and the other J<0, but I don't see how it relates to the...

I considered Rayleigh scattering, but the fact that the intensity is proportional to d^6 without taking into account the shape of the obstacle makes this approach questionable. The factor d^6 would imply that a tiny change in the characteristic length of the obstacle would increase the intensity...

Hi, I'm considering the case of diffraction by an object, with dimensions far smaller than the wavelenght of the light source. If I consider for example an sphere with radius 1nm, or a cube with edge length a≈2nm , and the usual λ≈500nm, how will the finite shape of the obstacle be of...

After reading about the diffraction and the multiple slits experiment, I've been wondering about what would happen if instead of slits, there were point-like obstacles (i.e., atoms). Using a plane wavefront and a finite number of obstacles, how would the light interact with this system?

At the beginning I thought that the edges of the sample interacted with the incoming photon waves and affected the interference patterns, creating some kind of boost effect, but I wasn't sure this was the correct approach, that's why I started to think that maybe the electronic bands played an...

You're right, I should have said scattering instead of diffraction. The thing is, in dark field, I can only see the light scattered by the edges of the sample, the light diffracted and reflected by the volume is blocked before arriving to the condenser. So basically, I'm wondering why I'm able...

There's literature about the use of FGR to calculate the absorption in graphene, it yields the result A= Nπα, N is the number of layers (in my case, I use single layer silicene, or single layer graphene in the case you are proposing), and α is the fine structure constant. So for N=1, A= πα...