Wu Yijia, Jiang Hua, Chen Hua, Liu Haiwen, Liu Jie, Xie X C
International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
School of Physical Science and Technology, Soochow University, Suzhou 215006, China.
Phys Rev Lett. 2022 Mar 11;128(10):106804. doi: 10.1103/PhysRevLett.128.106804.
Spin superconductor (SSC) is an exciton condensate state where the spin-triplet exciton superfluidity is charge neutral while spin 2(ℏ/2). In analogy to the Majorana zero mode (MZM) in topological superconductors, the interplay between SSC and band topology will also give rise to a specific kind of topological bound state obeying non-Abelian braiding statistics. Remarkably, the non-Abelian geometric phase here originates from the Aharonov-Casher effect of the "half-charge" other than the Aharonov-Bohm effect. Such topological bound state of SSC is bound with the vortex of electric flux gradient and can be experimentally more distinct than the MZM for being electrically charged. This theoretical proposal provides a new avenue investigating the non-Abelian braiding physics without the assistance of MZM and charge superconductor.
自旋超导体（SSC）是一种激子凝聚态，其中自旋三重态激子超流是电荷中性的，而自旋为2（ħ/2）。类似于拓扑超导体中的马约拉纳零模（MZM），SSC与能带拓扑之间的相互作用也将产生一种遵循非阿贝尔编织统计的特定拓扑束缚态。值得注意的是，这里的非阿贝尔几何相位源自“半电荷”的阿哈罗诺夫 - 卡什效应，而非阿哈罗诺夫 - 玻姆效应。SSC的这种拓扑束缚态与电通量梯度的涡旋相关联，并且由于带电，在实验上可能比MZM更易于区分。这一理论提议为在没有MZM和电荷超导体辅助的情况下研究非阿贝尔编织物理提供了一条新途径。
