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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
E-Mail
ljubicam@illinois.edu
Phone
217-300-6393
Views
45
Originating Calendar
Physics - 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.

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