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- W2783006861 abstract "We consider quantum rings realized in materials where the dynamics of charge carriers mimics that of two-dimensional (2D) Dirac electrons. A general theoretical description of the ring-subband structure is developed that applies to a range of currently available 2D systems, including graphene, transition-metal dichalcogenides, and narrow-gap semiconductor quantum wells. We employ the scattering-matrix approach to calculate the electronic two-terminal conductance through the ring and investigate how it is affected by Dirac-electron interference. The interplay of pseudo-spin chirality and hard-wall confinement is found to distinctly affect the geometric phase that is experimentally accessible in mesoscopic-conductance measurements. We derive an effective Hamiltonian for the azimuthal motion of charge carriers in the ring that yields deeper insight into the physical origin of the observed transport effects, including the unique behavior exhibited by the lowest ring subband in the normal and topological (i.e., band-inverted) regimes. Our work provides a unified approach to characterizing confined Dirac electrons, which can be used to explore the design of valley- and spintronic devices based on quantum interference and the confinement-tunable geometric phase." @default.
- W2783006861 created "2018-01-26" @default.
- W2783006861 creator A5009562687 @default.
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- W2783006861 creator A5061579832 @default.
- W2783006861 date "2018-05-15" @default.
- W2783006861 modified "2023-10-12" @default.
- W2783006861 title "Dirac electrons in quantum rings" @default.
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- W2783006861 doi "https://doi.org/10.1103/physrevb.97.205421" @default.
- W2783006861 hasPublicationYear "2018" @default.
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