Designing Extremely Low-Power Topological Transistors with 1T'-MoS₂ and HZO for Cryogenic Applications

Large-scale quantum computing requires cryogenic electronic controllers such as control/readout and routing circuits. However, current technologies face high-power dissipation problems, hindering large-scale qubit integration. Here, we theoretically propose extremely low-power cryogenic topological transistors, i.e., negative-capacitance topological insulator field-effect transistors (NC-TIFETs). By combining a gate-field-induced two-dimensional 1T'-molybdenum disulfide (MoS₂) topological channel with a hafnium-zirconium oxide (HZO) ferroelectric gate insulator, NC-TIFETs exhibit an extremely steep-slope transfer curve and ultrahigh transconductance at low drain voltage (V_D). Therefore, NC-TIFETs are a compelling candidate for minimizing power dissipation in the cryogenic electronic interfaces essential for large-scale quantum computing systems.