arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0802.1108cond-mat.str-elcond-mat.mes-hall
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扩展量子环的分数周期性和磁性

Fractional periodicity and magnetism of extended quantum rings

Y. Hancock, J. Suorsa, E. Tölö, A. Harju

摘要:

研究了小磁通穿透$t-t'-U$环的磁特性和持续电流的性质。一个有效的刚性转子的描述,制定了这个系统,这与过渡到铁磁状态的模型。给出了有效刚体转动开始的判据。该模型被用来理解连续模型的基态解的二维少粒子硬壁量子点,铁磁解决方案,即使没有塞曼耦合自旋。在有效刚性旋转开始后,可以确定格点模型和连续体模型本征态结果之间的97- 98%对应性。

英文摘要:

The magnetic properties and nature of the persistent current in small flux-penetrated $t-t'-U$ rings are investigated. An effective rigid-rotator description is formulated for this system, which coincides with a transition to a ferromagnetic state in the model. The criteria for the onset of effective rigid rotation is given. The model is used to understand continuum model ground-state solutions for a 2D few-particle hard-wall quantum dot, where ferromagnetic solutions are found even without the Zeeman coupling to spin. After the onset of effective rigid rotation, a 97--98% correspondence can be determined between the lattice model and continuum model eigenstate results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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