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arXiv 0811.0590cond-mat.str-el
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强耦合极限下无自旋费米子晶格模型中的自发电流

Spontaneous Currents in Spinless Fermion Lattice Models at the Strong-Coupling Limit

Sumiran Pujari, C. L. Henley

摘要:

什么样的格点哈密顿量明显具有有序态和自发轨道流?我们考虑相互作用的无自旋费米子上的正方形格子阵列,连接弱跳跃;阵列的几何形状可能是一个2 × 2L的梯子,一个2 × 2 × 2L的“管”,或一个2L × 2L的正方形网格。在半满情况下,我们导出了一个用赝自旋表示的有效哈密顿量,其中一个分量代表轨道流,并找到了轨道流长程序的充分条件。我们考虑上述无自旋模型的自旋变体,并与文献中声称具有自发电流的其他自旋模型进行接触。

英文摘要:

What kind of lattice Hamiltonian manifestly has an ordered state with spontaneous orbital currents? We consider interacting spinless fermions on an array of square plaquettes, connected by weak hopping; the array geometry may be a 2 x 2L ladder, a 2 x 2 x 2L "tube", or a 2L x 2L square grid. At half filling, we derive an effective Hamiltonian in terms of pseudospins, of which one component represents orbital currents, and find the conditions sufficient for orbital current long-range order. We consider spinfull variants of the aforesaid spinless models and make contact with other spinfull models in the literature purported to possess spontaneous currents.

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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