Known typos and errors in the Book

see here

Known typos and errors in the homeworks

  • Note to tutors. Make sure you have the solutions for THIS year's homeworks. They are similar to last year but a few of the problems have changed and a few of the solutions have been improved.
  • A trivial typo in question 2.5 last line before part b. The word "are" is extraneous.
  • There is a trivial typo in question 3.7. Six lines from the end, the scattering lengths of Na and H should both be x 10^{-5), not 10^5 (nuclear scattering lengths are comparable with the size of the nucleus). Makes absolutely no difference to the question, but just to be correct. (Thank you Andrew Boothroyd for catching this!).
  • Also last part of 3.7, the word should be "well" not "wells"
  • Question 4.6.d the word is carriers not carries.
  • Question 6.4. The value of A should have two factors of k_b downstairs!
  • Question 6.13: What quantity is it that the question should be asking about? Consider a *single site* of the system. Suppose at temperature T=0 this single site is Cu. Now heat up the system, calculate for this site only as function of temperature. Another possibility is to ask for the expectation of sigma_i sigma_j where i and j are neighbors. (Maybe this is better?)

    Known errors from lectures

  • Lecture 3: I mistakenly wrote k_f and called it fermi momentum. If it satisfies hbar^2 k_f^2 / (2 m) = E_F, then it is the fermi wavevector. Fermi momentum would be hbar k_f.
  • Lecture 9: As with the book Defition 12.1.1, the claim in lecture was that a lattice is a set of vectors where addition of two vectors in the set gives a third. However, this allows sets like the real numbers to be called a lattice. To remove this possibility, we should also require a finite number of lattice points per unit volume.
  • At some point someone asked if ice was a crystal -- I waffled. Ice is a bit of a difficult case -- while it is close to a crystal, it remains slightly disordered even at low temperature.