PHYS-EV0001 - Quantum field theory in condensed matter physics, Lecture, 9.1.2023-6.4.2023
Kurssiasetusten perusteella kurssi on päättynyt 06.04.2023 Etsi kursseja: PHYS-EV0001
Week 9 prelecture assignment
Now we have already introduced all the of the required QFT tools that we need on this course and this week involves mainly applications.
On Monday we will again look at the impurity problem and look at what kind of perturbation a localized charge will cause in an electron gas (say, a metal). The result is not very encouraging.
On Wednesday we will improve our model by using the first self-consistent model of our course: the self-consistent Hartree model. The resulting random phase approximation for the response function of the electron gas due to localized charge perturbation will fix the problems from the Monday's session.
And on Thursday we will consider a slightly alternative (off-)topic: quantum nonsense. Quantum mechanics, and quantum field theory in particular, seems to generate infinite amounts of nonsense, and scientists should be aware of it.
The prelecture assigment today is the PBS Space Time video on quasiparticles (15 minutes)
Quasiparticles are actually one of the strengths of condensed matter physics, since their properties (dispersion relation and interaction characteristics) can be tuned by (lattice) geometry and external fields. What quasiparticles can you name? The video listed a few quasiparticles, but perhaps you know some others as well? Do you have any questions?