期刊
PHYSICAL REVIEW LETTERS
卷 107, 期 16, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.166804
关键词
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资金
- Academy of Finland
- ERC [240362-Heattronics]
According to the general classification of topological insulators, there exist one-dimensional chirally (sublattice) symmetric systems that can support any number of topological phases. We introduce a zigzag fermion chain with spin-orbit coupling in magnetic field and identify three distinct topological phases. Zero-mode excitations, localized at the phase boundaries, are fractionalized: two of the phase boundaries support +/- e/2 charge states while one of the boundaries support +/- e and neutral excitations. In addition, a finite chain exhibits +/- e/2 edge states for two of the three phases. We explain how the studied system generalizes the Peierls-distorted polyacetylene model and discuss possible realizations in atomic chains and quantum spin Hall wires.
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