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arXiv 1802.05977cond-mat.str-el
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掺杂Mott反铁磁体中的隐自旋电流

Hidden spin current in doped Mott antiferromagnets

Wayne Zheng, Zheng Zhu, D. N. Sheng, Zheng-Yu Weng

摘要:

我们利用精确对角化和密度矩阵重整化群方法研究了掺杂莫特绝缘体的性质。在基态中发现了持续的自旋电流,它伴随着与掺杂空穴相关的非零总动量或角动量。后者决定了一个非平凡的基态简并。通过进一步使简并基态与零或单向自旋电流叠加,我们表明,不同的空间电荷和自旋调制模式将出现。这样的异常仍然存在的奇数个孔,但自旋电流,基态简并,和电荷/自旋调制完全消失的偶数个孔,与两个孔的基态表现出d波对称性。将讨论由于多体Berry-like相位及其对掺杂空穴的动量分布的影响而引起的自旋电流的理解。

英文摘要:

We investigate the nature of doped Mott insulators using exact diagonalization and density matrix renormalization group methods. Persistent spin currents are revealed in the ground state, which are concomitant with a nonzero total momentum or angular momentum associated with the doped hole. The latter determines a nontrivial ground state degeneracy. By further making superpositions of the degenerate ground states with zero or unidirectional spin currents, we show that different patterns of spatial charge and spin modulations will emerge. Such anomaly persists for the odd numbers of holes, but the spin current, ground state degeneracy, and charge/spin modulations completely disappear for even numbers of holes, with the two-hole ground state exhibiting a d-wave symmetry. An understanding of the spin current due to a many-body Berry-like phase and its impact on the momentum distribution of the doped holes will be discussed.

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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