R. G. Herb Condensed Matter Seminars |
Events During the Week of September 22nd through September 29th, 2024
Monday, September 23rd, 2024
- No events scheduled
Tuesday, September 24th, 2024
- No events scheduled
Wednesday, September 25th, 2024
- No events scheduled
Thursday, September 26th, 2024
- Electron Interactions in Rashba Materials
- Time: 10:00 am
- Place: 5310 Chamberlin
- Speaker: Yasha Gindikin, University of Minnesota
- Abstract: We present a bunch of novel phenomena stemming from the pair spin-orbit interaction (PSOI), which does not rely on structure inversion asymmetry but instead arises from Coulomb fields of interacting electrons in materials with a strong Rashba effect. First, PSOI can induce p-wave superconducting order without the need for any mediators of attraction. Depending on the sign and strength of the PSOI coupling, two distinct superconducting phases emerge in 3D systems, analogous to the A and B phases observed in superfluid He3. In contrast, 2D systems exhibit p_x \pm i p_y order parameter, leading to the time-reversal-invariant topological superconductivity. Second, a sufficiently strong PSOI can induce ferromagnetic ordering. It is associated with a deformation of the Fermi surface, which eventually leads to a Lifshitz transition from a spherical to a toroidal Fermi surface, with a number of experimentally observable signatures. Finally, in sufficiently clean Rashba materials, ferromagnetism and p-wave superconductivity may coexist. This state resembles the A1 phase of He3, yet it may avoid nodal points due to the toroidal shape of the Fermi surface.
- Host: Alex Levchenko
Friday, September 27th, 2024
- No events scheduled