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arXiv 0908.1894cond-mat.str-el
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一维电子/自旋系统磁化平台边缘点的磁化率

Susceptibility at the edge points of magnetization plateau of 1D electron/spin systems

Temo Vekua

摘要:

在玻色化理论框架下,研究了一维电子系统磁化曲线在磁化平台附近随磁场变化的行为。首先讨论了一维电子系统在饱和磁化强度下形成的平台。电子之间的相互作用我们用最低阶微扰来处理。我们表明,对于孤立系,其中的电子总数是不允许变化的,磁化率总是有限的一半填充。类似的陈述适用于许多其他磁化平台,其支持在没有负责模式去耦的特殊对称性或特征的情况下在1D电子/自旋系统中遇到的无间隙激发。我们证明它的例子高原在非理性值的磁化掺杂调制哈伯德链。最后讨论了吸引相互作用电子/反铁磁相互作用自旋1玻色子饱和磁化平台的弱耦合描述与零磁化平台的强耦合描述之间的联系。

英文摘要:

We study the behavior of magnetization curve as a function of magnetic field in the immediate vicinity of the magnetization plateaus of 1D electron systems within the bosonization formalism. First we discuss the plateau that is formed at the saturation magnetization of 1D electron system. Interactions between electrons we treat in the lowest order of perturbation. We show that for isolated systems, where total number of electrons is not allowed to vary, magnetic susceptibility stays always finite away of half filling. Similar statement holds for many other magnetization plateaus supporting nonmagnetic gapless excitations encountered in 1D electron/spin systems in the absence of special symmetries or features responsible for the mode decoupling. We demonstrate it on example of the plateaus at irrational values of magnetization in doped modulated Hubbard chains. Finally we discuss the connection between the weak coupling description of saturation magnetization plateau and strong coupling description of zero magnetization plateau of attractively interacting electrons/ antiferromagnetically interacting spin 1 Bosons.

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