Recent content by svletana

I'm having some trouble understanding some of the steps done in the uploaded paper. I'ts the 1975 paper by Sherrington where they explain the SK model for spin glass. Homework Statement and Homework Equations[/B] Up to equation 5 I understand all steps. I used J_0 = J_0 / N and J^2 = J^2 /...

Sorry i forgot to say! I am completing my university degree (licenciatura) in Buenos Aires :)

How do you learn to be a scientist without being told what to calculate, what to think about, etc? I feel like my hand has been held this whole time when I was doing experiments or calculations, I feel kind of unable to come up with new ideas myself sometimes. Are you a scientist? (doing a PhD...

That helped a lot, thanks! I can see now how with that you can make the terms with cos(nx)*cos(mx) with m=/=n cancel when you integrate from them being orthonormal :) The rest is history, thank you very much again!

I was doing the calculations for this: http://fermi.la.asu.edu/PHY531/cylinder/index.html But I can't figure out how to go from \frac{d\sigma}{d\phi} to the total cross section. My guess was that you did the integral from \phi=0 to \phi=2\pi, but that's not helping since I can't tell either how...

Homework Statement I'm trying to do all the calculations for the attached paper, and I'm having trouble with the boundary conditions for P polarization. My question is, how can I arrive to those conditions? The problem is 2D, an infinite dielectric cylinder coated with a layer of graphene...

Great Answer, thank you! The answers took a turn I did not expect :)

Let's say you take a beam of particles and pass it through a Stern Gerlach apparatus and you select one of the outgoing beams, therefore collapsing the wavefunction to certain values of orbital angular momentum and spin angular momentum. If you performed the Zeeman experiment on that beam, I'm...

Yeah I only really found out because I emailed my teacher asking how would I get 3 parameters from one equation, but that's exactly what he wrote... Thanks for your help! :)

Would the parameters \alpha = 3.67 \times 10^7, \epsilon = 1.93 \times 10^{11} \frac{V}{m} and \tau = 1.109 \times 10^{-9} seconds work? I had in mind that it would have to be an electric field strong enough to make the transition but not so big so hydrogen is ionized, a value of \tau around...

I just talked to my teacher and he said that i should choose the field going in the z direction so the only transition possible is to the |210> state and then choose parameters that would fit the problem... Guess that settles it :P

Sorry, r would be a vector, for example r = xî + yĵ + zk, so you could have it in any of the three directions.

Hello! I have the following problem I'm trying to solve: Homework Statement An Hydrogen atom in the state |100> is found between the plates of a capacitor, where the electric field (weak and uniform) is: E(t) = \epsilon e^{-\alpha t / \tau}. Calculate the parameters of the potential...

Thanks for your help! :) Instead of setting the real g value my teacher told me to try any value, so I did that. There was a problem with normalization as well, that was messing up the whole calculations. Thanks again!

Hello! I'm trying to simulate a one dimensional time independent BEC, I hope this is the right place to ask for help. First of all, here's my code in Python. import sys import numpy as np import matplotlib.pyplot as plt if len(sys.argv) == 1: niter = 100 elif len(sys.argv) == 2: niter...