Spin-fermion coupling in special systems
| Date/Time: | Thursday, 24 Oct 2019 from 1:10 pm to 2:00 pm |
|---|---|
| Location: | Physics 18/19 |
| Phone: | 515-294-7377 |
| Channel: | College of Liberal Arts and Sciences |
| Actions: | Download iCal/vCal | Email Reminder |
We study the spin-fermion coupling in systems where localized spins and itinerant electrons coexist. In general, this coupling leads to corrections in the excitation spectrum of both subsystem and affects, e.g., the electronic scattering rate or the spin susceptibility. In particular, it is interesting to analyze the mutual influence when the individual subsystems possess special quantum degrees of freedom. We illustrate this at two complimentary examples. We determine the damping of spin-waves in an antiferromagnet due to interaction with Dirac electrons as relevant for YbMnBi2. Furthermore, we demonstrate the emergence of clear non-Fermi-liquid behavior in a 3D metal coupled to 1D critical spin chains, a situation realized in Yb2Pt2Pb.