2016/12/12 by Niccolò Traverso Ziani, N. Traverso Ziani, C. Fleckenstein +5 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Charge (physics) #Charge density #Chemistry #Condensed matter physics #Context (archaeology) #Fractional quantum Hall effect #Graphene research and applications #Magnetic field #Magnetization #Oscillation (cell signaling) #Physics #Quantum #Quantum Hall effect #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Quantum oscillations #Quantum spin Hall effect #Renormalization #Semiclassical physics #Spin (aerodynamics) #Topological Materials and Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.95.205418
published as Phys. Rev. B 95, 205418 (2017)
arxiv created 2016/12/12 · openalex created_date 2017/01/26 · openalex publication_date 2017/05/16 · arxiv updated 2017/05/24 · openalex updated_date 2026/08/05
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 those fractional oscillations were predicted in the strong-coupling regime. 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. We demonstrate that the number of fractional oscillations of the charge density depends on the magnetization angle. In fact, a rotating magnetization can add or subtract fractional charges from the dot continuously. Finally, we address the renormalization induced by two-particle backscattering on the spin density, which is characterized by a dominant oscillation with a length twice as large as the charge-density oscillations.