- #1
bsmile
- 48
- 2
For any system, different experimental tools are able to measure the Fermi surface or electron dispersion. Then, are these Fermi surface or dispersion the ultimate outcome of the combined effects from the existing interactions? In other words, should the detected motion of electrons have been under the influence of all interactions in the system? These quasiparticles (if the Fermi surface is still sharp) should, then, have negligible residue interaction among them, is this?
My guess is yes, but then I cannot understand the subsequent concerns. Take cuprate as an example. It is known to have hot spots and (pi,pi) magnetic instability, thus the quasi-particles have been influenced to have these properties, and the residue interactions among them should be few. But why measurement on conductivity etc shows serious deviation from the weakly interacting quasi-particle behaviors?
Thanks,
My guess is yes, but then I cannot understand the subsequent concerns. Take cuprate as an example. It is known to have hot spots and (pi,pi) magnetic instability, thus the quasi-particles have been influenced to have these properties, and the residue interactions among them should be few. But why measurement on conductivity etc shows serious deviation from the weakly interacting quasi-particle behaviors?
Thanks,