Inelastic neutron scattering was used to probe edge states in a quantum spin liquid. The experiment was performed on finite length antiferromagnetic spin-1 chains in [Formula presented]. At finite fields, there is a Zeeman resonance below the Haldane gap. The wave-vector dependence of its intensity provides direct evidence for staggered magnetization at chain ends, which decays exponentially towards the bulk [[Formula presented] at [Formula presented]]. Continuum contributions to the chain-end spectrum indicate interchain segment interactions. We also observe a finite size blueshift of the Haldane gap. © 2003 The American Physical Society.
Publication Source (Journal or Book title)
Physical Review Letters
Kenzelmann, M., Xu, G., Zaliznyak, I., Broholm, C., DiTusa, J., Aeppli, G., Ito, T., Oka, K., & Takagi, H. (2003). Structure of End States for a Haldane Spin Chain. Physical Review Letters, 90 (8), 4. https://doi.org/10.1103/PhysRevLett.90.087202