Institute for Condensed Matter Physics Seminar: Texture-induced spin-orbit coupling and skyrmion-electron bound states in a Néel antiferromagnet
- Event Type
- Seminar/Symposium
- Sponsor
- Physics Department
- Location
- ESB 190
- Date
- Oct 2, 2023 12:00 pm
- Speaker
- Revaz Ramazashvili, Laboratoire de Physique Théorique, Toulouse
- Contact
- Ljubica Milutinovic
- ljubicam@illinois.edu
- Phone
- 217-300-6393
- Views
- 147
- Originating Calendar
- Physics - The Anthony J Leggett Institute for Condensed Matter Theory Seminar
We derive an effective-mass electron Hamiltonian for a Néel antiferromagnet in the presence of a smooth texture of the staggered magnetization. For certain locations of electron band extrema, the texture produces a peculiar and anomalously strong spin-orbit coupling of the scale ℏv/L, with v the Fermi velocity and L the relevant length scale of the texture. For a skyrmion texture, this coupling generates electron bound states, whose energy scale is given by the gap Δ in the electron spectrum. With dopant carriers, such bound states turn the skyrmion into a charged particle, that can be manipulated by electric field.