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Fractionalization in Superconductor Josephson Junction Arrays Hinged by Quantum Spin Hall edges

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arxiv 0911.1782 v2 pith:LKCMKXVY submitted 2009-11-09 cond-mat.stat-mech cond-mat.str-el

Cenke Xu , Liang Fu This is my paper · ORCID
classification cond-mat.stat-mechcond-mat.str-el
keywords charge-ehalljosephsonjunctionmajoranaquantumspinsuperconductor
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In this paper we study a novel superconductor-ferromagnet-superconductor (SC-FM-SC) Josephson junction array deposited on top of a two-dimensional quantum spin Hall (QSH) insulator. The existence of Majorana bound states at the interface between SC and FM gives rise to charge-e tunneling, in addition to the usual charge-2e Cooper pair tunneling, between neighboring superconductor islands. Moreover, because Majorana fermions encode the information of charge number parity, an exact Z_2 gauge structure naturally emerges and leads to many new insulating phases, including a deconfined phase where electrons fractionalize into charge-e bosons and topological defects. A new superconductor-insulator transition has also been found.

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  1. One-dimensional Dirac modes in the core of a pentagonal topological crystalline insulator nanowire

    cond-mat.mes-hall 2026-08 conditional novelty 7.0 of 10

    Pentagonal SnTe-class nanowires with cationic twin planes are predicted to host two spatially separated helical Dirac modes, one at the core and one at the outer surface.

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