Dark solitons with Majorana fermions in spin-orbit-coupled Fermi gases.
Dark solitons with Majorana fermions in spin-orbit-coupled Fermi gases.
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DOI：
10.1103/physrevlett.113.130404
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发表时间：
2014-01
影响因子：
8.6
通讯作者：
Yong Xu;Li Mao;Biao Wu;Chuanwei Zhang
中科院分区：
文献类型：
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作者：
Yong Xu;Li Mao;Biao Wu;Chuanwei Zhang
我们发现，一个单一的暗孤子可以存在于自旋轨道耦合费米气体与高自旋不平衡，自旋轨道耦合有利于均匀的超流体比非均匀的富尔德-费雷尔-拉金-奥夫钦尼科夫状态，导致暗孤子激发在高度不平衡的气体。在临界自旋不平衡以上，两个拓扑的没有相互作用的马约拉纳费米子可以共存于一个暗孤子中，为通过控制孤子来操纵马约拉纳费米子铺平了道路。在拓扑转变点处，孤子两端的原子密度差突然消失，这为拓扑孤子的识别提供了一个信号。
We show that a single dark soliton can exist in a spin-orbit-coupled Fermi gas with a high spin imbalance, where spin-orbit coupling favors uniform superfluids over nonuniform Fulde-Ferrell-Larkin-Ovchinnikov states, leading to dark soliton excitations in highly imbalanced gases. Above a critical spin imbalance, two topological Majorana fermions without interactions can coexist inside a dark soliton, paving a way for manipulating Majorana fermions through controlling solitons. At the topological transition point, the atom density contrast across the soliton suddenly vanishes, suggesting a signature for identifying topological solitons.