Topological insulator magnetic tunnel junctions: Quantum hall effect and fractional charge via folding

Research output: Contribution to journalArticle

Abstract

We provide a characterization of tunneling between coupled topological insulators in 2D and 3D under the influence of a ferromagnetic layer. We explore conditions for such systems to exhibit integer quantum Hall physics and localized fractional charge, also taking into account interaction effects for the 2D case. We show that the effects of tunneling are topologically equivalent to a certain deformation or folding of the sample geometry. Our key advance is the realization that the quantum Hall or fractional charge physics can appear in the presence of only a single magnet unlike previous proposals which involve magnetic domain walls on the surface or edges of topological insulators, respectively. We give illustrative topological folding arguments to prove our results and show that for the 2D case our results are robust even in the presence of interactions.

Original languageEnglish (US)
Article number176803
JournalPhysical review letters
Volume109
Issue number17
DOIs
StatePublished - Oct 25 2012

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quantum Hall effect
tunnel junctions
folding
insulators
physics
magnetic domains
integers
domain wall
proposals
magnets
interactions
geometry

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Topological insulator magnetic tunnel junctions : Quantum hall effect and fractional charge via folding. / Meng, Qinglei; Vishveshwara, Smitha; Hughes, Taylor L.

In: Physical review letters, Vol. 109, No. 17, 176803, 25.10.2012.

Research output: Contribution to journalArticle

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