Interplay of strongly correlated electrons and localized Ising moments in one dimension

Article

关键词: PHASE-DIAGRAM;    CHARGE;    SYSTEM;    BETS;   

DOI  :  10.1103/PhysRevB.81.245104

来源: SCIE

【 摘 要 】

We study ground-state properties of a one-dimensional quarter-filled strongly correlated electronic chain coupled to an antiferromagnetic Ising chain by the density-matrix renormalization-group method. We focus on the case where large Coulomb interactions localize the charges on every other site. Both the electronic spins and the Ising moments interact antiferromagnetically within each chain. Since the number of electrons is half as that of Ising moments, the two intrachain Neel orders are incompatible and compete with each other. When the Ising chain is ordered (gapped), the electrons are magnetically frustrated, which is reflected in the nearly degenerate energy levels with different magnetization. The resultant magnetoelectric effect is elucidated as a suppression of a charge gap by the magnetic field.

【 授权许可】

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