Fine Structure and Fractional Aharonov-Bohm Effect

Abstract

We find a fine structure in the Aharonov-Bohm effect, characterized by the appearence of a new type of periodic oscillations having smaller fractional period and an amplitude, which may compare with the amplitude of the conventional Aharonov-Bohm effect. Specifically, at low density or strong coupling on a Hubbard ring can coexist along with the conventional Aaronov-Bohm oscillations with the period equal to an integer, measured in units of the elementary flux quantum, two additional oscillations with periods $1/N$ and $M/N$. The integers $N$ and $M$ are the particles number and the number of down-spin particles, respectively. {}From a solution of the Bethe ansatz equations for $N$ electrons located on a ring in a magnetic field we show that the fine structure is due to electron-electron and Zeeman interactions. Our results are valid in the dilute density limit and for an arbitrary value of the Hubbard repulsion $U$

40 pages (Latex,Revtex) 12 figures by request, in Technical Reports of ISSP , Ser. A, No.2836 (1994)

References in corpus (3)

• Persistent Currents in Mesoscopic Hubbard Rings with Spin-Orbit Interaction
• Strong-Correlations Versus U-Center Pairing and Fractional Aharonov-Bohm Effect
• Persistant Current in Isolated Mesoscopic Rings

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