Binary topological logic gates in Kane-Mele nanostructures via local control of edge-state transport

Topological edge states offer a promising basis for post-CMOS device concepts. However, their use in elementary logic requires simple and physically transparent architectures. Here we study binary logic in Kane-Mele nanostructures with spatially localized control regions. Logical inputs are encoded by local electrostatic, exchange-like, and Rashba-type perturbations. The output is read from terminal transmission within the Landauer-Buttiker framework. We demonstrate working NOT and AND gates in multiterminal honeycomb geometries. Real-space current maps show that their operation is governed by controlled rerouting of edge currents rather than by finely tuned interference. Both gates reproduce the complete truth table in all 50 Anderson-disorder realizations at each tested disorder strength up to W/t=0.1. The NOT gate also remains correctly classified at all 441 points of a two-parameter control scan. Geometric tests confirm stable operation for several patch lengths and branch widths. These results establish Kane-Mele nanostructures as a transparent and numerically robust platform for primitive topological binary logic.

K. Zberecki · 2026