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Fractional charge oscillations in quantum spin Hall quantum dots
Traverso Ziani, Nicolo; Fleckenstein, Christoph; Dolcetto, Giacomo et al.
2016
 

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Abstract :
[en] We show that correlated two-particle backscattering can induce fractional charge oscillations in a quantum dot built at the edge of a two-dimensional topological insulator by means of magnetic barriers. The result nicely complements recent works where the fractional oscillations were obtained employing of semiclassical treatments. Moreover, since by rotating the magnetization of the barriers a fractional charge can be trapped in the dot via the Jackiw-Rebbi mechanism, the system we analyze offers the opportunity to study the interplay between this noninteracting charge fractionalization and the fractionalization due to two-particle backscattering. In this context, we demonstrate that the number of fractional oscillations of the charge density depends on the magnetization angle. Finally, we address the renormalization induced by two-particle backscattering on the spin density, which is characterized by a dominant oscillation, sensitive to the Jackiw-Rebbi charge, with a wavelength twice as large as the charge density oscillations.
Disciplines :
Physics
Author, co-author :
Traverso Ziani, Nicolo;  University of Wurzburg
Fleckenstein, Christoph;  University of Wurzburg
Dolcetto, Giacomo ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Trauzettel, Bjorn;  University of Wurzburg
Language :
English
Title :
Fractional charge oscillations in quantum spin Hall quantum dots
Publication date :
12 December 2016
Available on ORBilu :
since 14 March 2017

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