Recent content by yezia

Wow that's an incredible little story you had there! You made some great points about this "teacher has more knowledge than students because of repetition". And yeah genius is something outstanding to encounter; I would have loved to meet people as Landau or Feynman, I had 2 professors whom I...

I've explained in the thread what I mean by "being good" in a branch of physics. There is no comparison with "non-physicists" here. No need to be condescending regarding the Solids/Circuits/Maths part, don't worry I'm doing quite good in my degree. Ahah I love this. Do you know the author ? I...

Sorry everyone, very busy weeks. Thank you all for your answers: - some of you pointed out how "good" is always relative, for me it's not only have an intuition (not necessarily deep) + being to able to destroy undergrad/grad exercices in anything (a branch here is like Mechanics, Fluids, EM...

Hi all, I've been pondering over this question for a long time. Of course physicists are specialists in a specific branch (even in those branches, sometimes they specialize themselves in an ultra-specific sub-branch) in which they produce research. I've noticed some professors at my uni...

Wow that's deeper than I thought ^^

You are probably right because PhD is kind of a big commitment, you know, 3-4 more years in full research mode .. Once you get out of the academic world, it might be challenging. But as I said, what I love above all is coding! Research on the other hand is cool but I just see myself...

Thank you for your answer! But as I previously said, this is still research-oriented and, in an ideal world, would lead to a PhD. I was thinking of something more "direct" to the working world.

Hi everyone! Merry christmas first and I hope you're getting great rest with close ones around :) Well, as title may suggest it, I will graduate soon in physics and I'm not sure of the next step in my academic curriculum. I like theoretical physics, I've touched upon most fondamental physics...

When ##T\rightarrow 0##, the internal energy is not 0. ##T = 0## corresponds to the state of minimal energy, and in this case, all the spins must be anti-parallel to the magnetic field (do you see why ?). What is the expression of ##U(T=0)## now that you know this ? On the other hand, when...

I did not read everything, but a quick suggestion for method 1: try to express the whole thing in terms of ##\dfrac{U}{\mu H}## and factor out (it's normal if some of your factorizations won't lead anywhere) ##N##. I don't know the exact expression of the entropy, and since you have doubt on the...

I'm glad our long discussion managed to help you!

Yes, in the FM case, the correlations should be positive. In the AFM case, the sign should alternate. The fact that your answer does not depend on the sign of ##J## suggests a problem. The GS could be wrong, or even the functions you coded. But if you say you built the Hamiltonian with these...

I'm starting to understand what you did. I believe the general outline of your answer (mainly the reduction from ##2^{2N}## to ##2^N## operations) is correct, I don't see any blatant errors. Now I'm not sure about the way you "select" the non-zero elements (for ##\mathrm{S}_x## and...

Dear woodydewar, I'm sorry for the late reply. I forgot this thread was not solved and did not really pay attention to it/my mails. I am currently not home, but I will take a closer look to your method before next monday.

I will assume your hamiltonian to be of the simplest form: $$ \mathrm{H} = -J\sum_i \mathbf{S}_i\cdot\mathbf{S}_{i+1}. $$ The correlations depend not only on the sign of ##J## but also the spin magnitude. Can you at least test the influence of ##J## ? Please also provide the way you build the...