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- W2232969380 abstract "We study the electronic and transport properties of a topological insulator nanowire including selective magnetic doping of its surfaces. We use a model which is appropriate to describe materials like ${text{Bi}}_{2}{text{Se}}_{3}$ within a $mathbf{k}ifmmodecdotelsetextperiodcenteredfi{}mathbf{p}$ approximation and consider nanowires with a rectangular geometry. Within this model the magnetic doping at the (111) surfaces induces a Zeeman field which opens a gap at the Dirac cones corresponding to the surface states. For obtaining the transport properties in a two terminal configuration we use a recursive Green's function method based on a tight-binding model which is obtained by discretizing the original continuous model. For the case of uniform magnetization of two opposite nanowire (111) surfaces we show that the conductance can switch from a quantized value of ${e}^{2}/h$ (when the magnetizations are equal) to a very small value (when they are opposite). We also analyze the case of nonuniform magnetizations in which the Zeeman field on the two opposite surfaces change sign at the middle of the wire. For this case we find that conduction by resonant tunneling through a chiral state bound at the middle of the wire is possible. The resonant level position can be tuned by imposing an Aharonov-Bohm flux through the nanowire cross section." @default.
- W2232969380 created "2016-06-24" @default.
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- W2232969380 date "2015-12-29" @default.
- W2232969380 modified "2023-10-17" @default.
- W2232969380 title "Transport in selectively magnetically doped topological insulator wires" @default.
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- W2232969380 doi "https://doi.org/10.1103/physrevb.92.235445" @default.
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