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arXiv 0905.2946cond-mat.str-elcond-mat.mes-hall
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宇称破缺和时间反演对称性的二维费米子成对态的拓扑序

Topological order in paired states of fermions in two-dimensions with breaking of parity and time-reversal symmetries

N. Bray-Ali, L. Ding, S. Haas

摘要:

我们数值评估纠缠谱(奇异值分解的波函数)的费米子在二维的配对状态,打破宇称和时间反转对称性,专注于自旋极化$p_x+ip_y$的情况下。弱配对(BCS)相位的纠缠谱包含一个Majorana零模,表明非阿贝尔拓扑序。相反,对于强配对(BEC)阶段,我们没有发现这样的模式,符合阿贝尔拓扑顺序。

英文摘要:

We numerically evaluate the entanglement spectrum (singular value decomposition of the wavefunction) of paired states of fermions in two dimensions that break parity and time-reversal symmetries, focusing on the spin-polarized $p_x+ip_y$ case. The entanglement spectrum of the weak-pairing (BCS) phase contains a Majorana zero mode, indicating non-Abelian topological order. In contrast, for the strong-pairing (BEC) phase, we find no such mode, consistent with Abelian topological order.

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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