Robust edge states in magnetic soliton racetrack
نویسندگان
چکیده
Precise positioning of magnetic solitons requires controllable artificial pinning, while the accurate determination pinning profile remains a challenge. Here, we propose topological solution to this problem. Taking domain wall (DW) as representative example, study collective dynamics interacting DWs in racetrack with sites alternate distances. By mapping governing equations DW motion Su-Schrieffer-Heeger model and evaluating quantized Zak phase, predict two topologically distinct phases racetrack. A robust edge state emerges at either one or both ends depending on parity number ratio alternating intersite lengths. We show that in-gap oscillation frequency has fixed value which depends only geometrical shape notch, is insensitive device imperfections inhomogeneities. The spring coefficient potential can be quantified square multiplied by its constant mass. Our findings pave way determining high accuracy for generic suggest well soliton-based unique playground phase transitions.
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ژورنال
عنوان ژورنال: Physical review
سال: 2021
ISSN: ['0556-2813', '1538-4497', '1089-490X']
DOI: https://doi.org/10.1103/physrevb.103.054438