Crossed Andreev reflection in topological insulator nanowire T junctions
Fuchs, Jacob and Barth, Michael and Gorini, Cosimo and Adagideli, İnanç and Richter, Klaus (2021) Crossed Andreev reflection in topological insulator nanowire T junctions. Physical Review B, 104 (8). ISSN 2469-9950 (Print) 2469-9969 (Online)
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Official URL: http://dx.doi.org/10.1103/PhysRevB.104.085415
We numerically study crossed Andreev reflection (CAR) in a topological insulator nanowire T junction where one lead is proximitized by a superconductor. We perform realistic simulations based on the three-dimensional (3D) Bernevig-Hughes-Zhang model and compare the results with those from an effective two-dimensional (2D) surface model, whose computational cost is much lower. Both approaches show that CAR should be clearly observable in a wide parameter range, including perfect CAR in a somewhat more restricted range. Furthermore, it can be controlled by a magnetic field and is robust to disorder. Our effective 2D implementation allows us to model systems of micron size, typical of experimental setups but computationally too heavy for 3D models.
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