Recent content by forever_physicist

  1. forever_physicist

    I Quantum operators and trasformation under rotations

    Good morning! I have a problem in understanding the steps from vectors to operators. Imagine you are given a vectorial observable. In classical mechanics, after rotating the system it transform with a rotation matrix R. If we go to quantum mechanics, this observable becomes an operator that is...
  2. forever_physicist

    A Fano resonance theory

    Yes sorry.. the paper I'm talking about is the original one from Fano, U. Fano, "Effects of Configuration Interaction on Intensities and Phase Shifts", PR 124, 6 (1961). For now I only want to study the theory to understand all the physics behind, is for this that I wrote this post!
  3. forever_physicist

    A Fano resonance theory

    Good evening. I wanted to study the theory about Fano resonances. I tried to read the paper but it doesn't seem very pedagogical to me and I coudn't understand all the details. Are there any notes or any good book where I can find a more precise theoretical description? Thank you
  4. forever_physicist

    A Inequivalent K and K' points in graphene

    Ok but if this is the case, why when in a DFT calculation we use the Irreducible Brillouin Zone, we only consider K? In principle it is not enough to consider only 1/12 of the hexagon as everybody do, right?
  5. forever_physicist

    A Inequivalent K and K' points in graphene

    Good evening to everybody! I have a question concerning monolayer graphene. In all the papers I read it is well specified that K and K' in graphene are not equivalent points, but I didn't find anywhere where is the difference between them. Can anybody tell me where this difference is coming...
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