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arXiv 1707.04718quant-phcond-mat.mes-hall
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非平衡配对Kitaev链的拓扑相

Topological phases in Kitaev chain with imbalanced pairing

C. Li, X. Z. Zhang, G. Zhang, Z. Song

摘要:

系统地研究了由非厄米对项引入的具有不平衡对产生和湮灭的Kitaev链。精确相图表明,在条件不平衡的影响下,拓扑相位仍然是鲁棒的。间隙相位的特征在于由拓扑不变量,扩展Zak相位,这是由双正交内积定义。这些相位在基态聚结发生的点处被破坏,这与时间反演对称性破缺有关。我们发现,在不间断的时间反演对称区域内,开链也存在Majorana边模,证明了这种非厄米系统中的体-边对应。

英文摘要:

We systematically study a Kitaev chain with imbalanced pair creation and annihilation, which is introduced by non-Hermitian pairing terms. Exact phase diagram shows that the topological phase is still robust under the influence of the conditional imbalance. The gapped phases are characterized by a topological invariant, the extended Zak phase, which is defined by the biorthonormal inner product. Such phases are destroyed at the points where the coalescence of groundstates occur, associating with the time-reversal symmetry breaking. We find that the Majorana edge modes also exist for the open chain within unbroken time-reversal symmetric region, demonstrating the bulk-edge correspondence in such a non-Hermitian system.

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