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TT: Fachverband Tiefe Temperaturen

TT 25: Poster Session: Topology

TT 25.2: Poster

Donnerstag, 30. September 2021, 13:30–16:00, P

Dirac-like particles in a box in shaped topological insulator nanowires — •Maximilian Fürst, Michael Barth, Cosimo Gorini, and Klaus Richter — Universität Regensburg

Topological insulator nanowires exhibit strong spin-orbit coupling with surface states which are well-protected against backscattering [1]. Due to their Dirac-like dispersion they are intersting materials for studying emergent relativistic effects in condensed matter. We show how TI nanowires can be used to generate Dirac-like particles in a box by exploiting geometrical properties of the wires and applying an external coaxial magnetic field. These quantized energy levels can be probed by conductance calculations. In order to do that, we employ the numerical Python package kwant [2] and implement a shaped 3D topological insulator nanowire with a 3D bulk model as well as an effective 2D surface model. Quantized and flux dependent conductance lines exhibit strong constraints on the physical state of the trapped electrons what makes a practical application as a magnetically tunable momentum filter possible.
[1] X.-L. Qi and S.-C. Zhang, Rev. Mod. Phys. 83, 1057 (2011)
[2] Ch. W. Groth et al., New J. Phys. 16, 063065 (2014)