Nemin Wei, UT-Austin

"Domain wall spin-texture in quantum Hall magnets"

Abstract: Recent experiments [Stepanov Petr, et al. Nature Physics 14.9,907; Wei et.al Science 362.229-233; Haoxin,arXiv:1904.11485] reported long range transport of spinful collective modes in single-layer graphene based quantum Hall magnets(QHMs), including transport across junctions between states with different Landau level filling factors. These experiments motivate a detailed study of the various junctions that can be formed between N=0 QHMs since the microscopic electronic and spin-texture structure near the junction influences the collective mode transmission rate. Using a self-consistent Hartree-Fock calculation, we show that the spin-textures around the junction of u=0 and u=pm 1 QHMs are wide, reaching ~140nm at B=8T. For the junction of u=-1 and u=1 QHMs, however, the domain wall is narrower and the spin-texture depends on the sublattice potential. I will explain the microscopic physics that controls these junction properties.