Fractionalization in Josephson junction arrays hinged by quantum spin Hall edges
Fractionalization in Josephson junction arrays hinged by quantum spin Hall edges
复制标题
由量子自旋霍尔边缘铰接的约瑟夫森结阵列的分段化
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
L. Fu
中科院分区：
文献类型：
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作者：
Cenke Xu;L. Fu
研究了沉积在二维量子自旋霍尔绝缘体上的超导体-铁磁体-超导体（SC-FM-SC）约瑟夫森阵列。在SC和FM之间的界面处的Majorana束缚态导致相邻超导岛之间的电荷-$e$隧穿，除了通常的电荷-$2e$库珀对隧穿。此外，由于马约拉纳费米子编码了电荷数宇称的信息，一个精确的Z 2规范结构自然出现，并导致了许多新的相，包括电子分裂为电荷e玻色子和拓扑缺陷的去精细相。还发现了一个非限定的SC-绝缘体转变。
We study a superconductor-ferromagnet-superconductor (SC-FM-SC) Josephson array deposited on top of a two-dimensional quantum spin Hall insulator. The Majorana bound state at the interface between SC and FM leads to charge-$e$ tunneling between neighboring superconductor islands, in addition to the usual charge-$2e$ Cooper pair tunneling. Moreover, because Majorana fermions encode the information of charge number parity, an exact ${Z}_{2}$ gauge structure naturally emerges and leads to many new phases, including a deconfined phase where electrons fractionalize into charge-$e$ bosons and topological defects. A deconfined SC-insulator transition has also been found.