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Bulletin of the American Physical Society

Extracting fractional statistics from superperiodic Aharonov-Bohm oscillations

Eun-Ah Kim, Steven Allan Kivelson

Published Mar 15, 2006• 0 citations
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Physical review. B, Condensed matter•Apr 15, 1997•1 citation
In systems with the spin-charge separation, the period of the Aharonov-Bohm (AB) oscillation becomes half of the flux quantum. This effect is at least related to the fact that for the creation of the holons (spinons) are needed two electrons. The effect is illustrated on the example of the Hubbard Hamiltonian with the aid of the bosonization including topological numbers and exists also in the Luttinger liquid on two chains. The relation to a fractional 1/N- AB effect, which can be associated with a modified Luttinger liquid, is discussed.
We study the persistent current in a quasi-one-dimensional ring with strongly correlated electrons forming a multichannel Wigner crystal (WC). The influence of the Coulomb interaction manifests itself only in the presence of external scatterers that pin the WC. Two regimes of weak and strong pinning are considered. For strong pinning we predict the Aharonov-Bohm oscillations with fractional period. Fractionalization is due to the interchannel coupling in the process of quantum tunneling of the WC. The fractional period depends on the filling of the channels and may serve as an indicator of non-Fermi-liquid behavior of interacting electrons in quasi-one-dimensional rings.