Title

Structure of End States for a Haldane Spin Chain

Document Type

Article

Publication Date

1-1-2003

Abstract

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

First Page

4

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