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- Title
Realization of Wilson fermions in topolectrical circuits.
- Authors
Yang, Huanhuan; Song, Lingling; Cao, Yunshan; Yan, Peng
- Abstract
The Wilson fermion (WF) is a fundamental particle in the theory of quantum chromodynamics. Theoretical calculations have shown that the WF with a half skyrmion profile represents a quantum anomalous semimetal phase supporting a chiral edge current, but the experimental evidence is still lacking. In this work, we report a direct observation of the WF in circuit systems. We find that WFs manifest as topological spin textures analogous to the half skyrmion, half-skyrmion pair, and Néel skyrmion structures, depending on their mass. Transformations of different WF states are realized by tuning the electric elements. We further experimentally observe the propagation of chiral edge current along the domain-wall separating two circuits with contrast fractional Chern numbers. Our work provides experimental evidence for WFs in topolectrical circuits. The nontrivial analogy between the WF state and the skyrmionic structure builds an intimate connection between the two burgeoning fields. The Wilson fermion is a particle in the theory of quantum chromodynamics that allows to solve the fermion doubling problem. Here the authors use topolectrical circuits to simulate Wilson fermions, and realize nontrivial topological phases characterized by different Chern numbers, including quantum anomalous semimetal.
- Subjects
PARTICLES (Nuclear physics); FERMIONS; QUANTUM chromodynamics; QUANTUM theory
- Publication
Communications Physics, 2023, Vol 6, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-023-01326-6