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arXiv 1812.02001cond-mat.quant-gascond-mat.mtrl-scicond-mat.str-elphysics.atom-phquant-ph
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Hofstadter-哈伯德模型中自旋不平衡引起的横向磁化

Spin-imbalance-induced transverse magnetization in the Hofstadter-Hubbard model

Bernhard Irsigler, Jun-Hui Zheng, Mohsen Hafez-Torbati, Walter Hofstetter

摘要:

研究了两个自旋态之间具有布居数差的费米子时间反演不变的Hofstadter-哈伯德模型。在强相互作用区,系统可以用有效自旋模型描述,我们通过经典的Monte-Carlo计算发现了一个奇异的自旋结构。值得注意的是,这种自旋结构表现出横向净磁化垂直于人口不平衡引起的磁化。因此,它本质上不同于倾斜反铁磁性。我们进一步研究了量子涨落的影响,在动态平均场近似,并获得了丰富的相图,包括铁磁,反铁磁,亚铁磁和横向磁化相。

英文摘要:

The fermionic, time-reversal invariant Hofstadter-Hubbard model with a population difference between the two spin states is investigated. In the strongly interacting regime, where the system can be described by an effective spin model, we find an exotic spin structure by means of classical Monte-Carlo calculations. Remarkably, this spin structure exhibits a transverse net magnetization perpendicular to the magnetization induced by the population imbalance. It is thus inherently different from canted antiferromagnetism. We further investigate effects of quantum fluctuations within the dynamical mean-field approximation and obtain a rich phase diagram including ferromagnetic, anti-ferromagnetic, ferrimagnetic, and transverse magnetization phases.

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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