Varying voltage of field-effect transistor uses potassium ions to change molybdenum disulfide semiconductor to metal, superconductor or insulator

https://phys.org/news/2025-03-transistor-reshapes-electronic-properties-2d.html

"sulfur atoms can be arranged in 2 different ways, creating 2H (semiconductor) or 1T (metallic)... higher voltage causes change from semiconductor to metallic, then, 2 options: (1) precisely guiding potassium ions into material/ cooling to –268°C, metal becomes superconductor, or (2) allowing potassium ions to leak out of metal at –193°C, metal becomes insulator... future: discovering new superconductors using this method on various 2D semiconductors that are like molybdenum disulfide"