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Title: Fractionalization in Josephson junction arrays hinged by quantum spin Hall edges

Abstract

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{sub 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.

Authors:
;  [1]
  1. Department of Physics, Harvard University, Cambridge, Massachusetts 02138 (United States)
Publication Date:
OSTI Identifier:
21366715
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 81; Journal Issue: 13; Other Information: DOI: 10.1103/PhysRevB.81.134435; (c) 2010 The American Physical Society; Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BOUND STATE; COOPER PAIRS; FERROMAGNETIC MATERIALS; INTERFACES; JOSEPHSON JUNCTIONS; MAJORANA THEORY; PARITY; SPIN; SUPERCONDUCTORS; TOPOLOGY; TUNNEL EFFECT; TWO-DIMENSIONAL CALCULATIONS; ANGULAR MOMENTUM; MAGNETIC MATERIALS; MATERIALS; MATHEMATICS; PARTICLE PROPERTIES; SUPERCONDUCTING JUNCTIONS

Citation Formats

Cenke, Xu, and Liang, Fu. Fractionalization in Josephson junction arrays hinged by quantum spin Hall edges. United States: N. p., 2010. Web. doi:10.1103/PHYSREVB.81.134435.
Cenke, Xu, & Liang, Fu. Fractionalization in Josephson junction arrays hinged by quantum spin Hall edges. United States. https://doi.org/10.1103/PHYSREVB.81.134435
Cenke, Xu, and Liang, Fu. Thu . "Fractionalization in Josephson junction arrays hinged by quantum spin Hall edges". United States. https://doi.org/10.1103/PHYSREVB.81.134435.
@article{osti_21366715,
title = {Fractionalization in Josephson junction arrays hinged by quantum spin Hall edges},
author = {Cenke, Xu and Liang, Fu},
abstractNote = {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{sub 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.},
doi = {10.1103/PHYSREVB.81.134435},
url = {https://www.osti.gov/biblio/21366715}, journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 13,
volume = 81,
place = {United States},
year = {2010},
month = {4}
}