One and Two Dimensional Spin Systems in the Regime Close to Deconfinement of Spinons
Abstract
Based on the Majumdar-Ghosh chain we construct several spin models which allow us to investigate spinon dynamics in the regime close to deconfinement of spinons. We consider the J1 - J2 - δ model, two coupled J1 - J2 chains (ladder), and a 2D array of coupled J1 - J2 chains. Using the picture of two spinons interacting with a string confining potential we calculate the singlet- triplet splitting, magnetic structure factor, tunneling amplitude of two spinons and the excitation spectra for the ladder and the array.
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