Barth, Michael and Fürst, Maximilian and Kozlovsky, Raphael and Richter, Klaus and Gorini, Cosimo (2025) Topological insulator constrictions: Dirac particles in a magnetochiral box. PHYSICAL REVIEW B, 112 (11): 115419. ISSN 2469-9950, 2469-9969
Full text not available from this repository. (Request a copy)Abstract
We study magnetotransport through topological insulator nanowires shaped in the form of a constriction, as can be obtained by etching techniques. The magnetic field is coaxial turning the nanowire into a magnetochiral junction. We show in a detailed analytical and numerical study that two main transport regimes emerge, depending on the central narrow region being short or long as compared to the magnetic length at the junction entrance and exit. In both cases the central region hosts Dirac-particle-in-a-box states due to magnetic confinement, whose conductance properties are strongly influenced by Landau levels at the ends of the constriction. Notably, in the low-energy regime only chiral states with a specific handedness can transport charge across the junction. Based on these properties and general symmetry considerations we argue that the shaped nanowire should exhibit strong magnetochiral nonreciprocal transport beyond linear response. We employ a numerical tight-binding implementation of an effective 2D model on a nonhomogeneous grid, capable of simulating samples of realistic sizes, and test its soundness against full simulations for scaled-down 3D topological insulator wires.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | FLUX SENSITIVITY; TRANSPORT |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Jul 2026 08:33 |
| Last Modified: | 15 Jul 2026 08:33 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66537 |
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