Promising regimes for the observation of topological degeneracy in spin chains

Autor: Sattler, Alexander, Daghofer, Maria
Rok vydání: 2024
Předmět:
Zdroj: Phys. Rev. B 110, 024404, 2024
Druh dokumentu: Working Paper
DOI: 10.1103/PhysRevB.110.024404
Popis: Both the Haldane spin chain and a topologically dimerized chain feature topologically protected edge states that are expected to be robust against some kind of noise. To elucidate whether it might be feasible to create such edge states in dimerized chains in a controlled manner in solid states environments, e.g. as spin chains on surfaces, as has already been successfully achieved with the Haldane chain, we investigate their robustness with respect to long-range coupling, anisotropies and finite chain length. The theoretical investigation is based on an alternating Heisenberg spin chain with spin-1/2, which is investigated using exact diagonalization. We find that dimerized chains and Haldane chains have robustness against long-range coupling and anisotropies. In particular, dimerized spin chains are significantly more robust than Haldane chains
Comment: 12 pages, 15 figures
Databáze: arXiv