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arXiv cond-mat/9702007cond-mat.str-el
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强关联环中的奇偶锁定效应

Parity-locking effect in a strongly-correlated ring

C. A. Stafford, D. F. Wang

摘要:

研究了电子-电子长程相互作用多通道环的可积模型中的轨道磁性。在一个非相互作用的多通道系统中,对外部磁通量的响应是许多反磁性和顺磁性贡献的总和,但我们发现,对于足够强的相关性,所有通道的贡献建设性地增加,导致奇偶校验(反磁性或顺磁性),这只取决于电子的总数。数值结果证实,这种奇偶锁定效应是强大的子带混合由于混乱。

英文摘要:

Orbital magnetism in an integrable model of a multichannel ring with long-ranged electron-electron interactions is investigated. In a noninteracting multichannel system, the response to an external magnetic flux is the sum of many diamagnetic and paramagnetic contributions, but we find that for sufficiently strong correlations, the contributions of all channels add constructively, leading to a parity (diamagnetic or paramagnetic) which depends only on the total number of electrons. Numerical results confirm that this parity-locking effect is robust with respect to subband mixing due to disorder.

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