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arXiv 0704.0776cond-mat.mes-hall
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锯齿形维格纳晶体中的自旋耦合

Spin coupling in zigzag Wigner crystals

A. D. Klironomos, Julia S. Meyer, T. Hikihara, K. A. Matveev

摘要:

我们考虑在浅限制势和低电子密度的情况下量子线中的相互作用电子。在一定的密度范围内,电子形成一个两行(锯齿形)维格纳晶体,其自旋性质由最近和次最近邻交换以及三粒子和四粒子环交换过程决定。所得到的锯齿形自旋链的相图具有完整的自旋极化和部分自旋极化的区域,除了一些非极化的相位,包括反铁磁性和二聚体顺序以及由四粒子环交换产生的新相位。

英文摘要:

We consider interacting electrons in a quantum wire in the case of a shallow confining potential and low electron density. In a certain range of densities, the electrons form a two-row (zigzag) Wigner crystal whose spin properties are determined by nearest and next-nearest neighbor exchange as well as by three- and four-particle ring exchange processes. The phase diagram of the resulting zigzag spin chain has regions of complete spin polarization and partial spin polarization in addition to a number of unpolarized phases, including antiferromagnetism and dimer order as well as a novel phase generated by the four-particle ring exchange.

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