Alex M\"uller, the High-Tc Field-Effect Transistor and Electric-Field Gated Quantum Materials

Alex M\"uller and Georg Bednorz are widely recognized for their trailblazing discovery of high-temperature superconductivity and their groundbreaking research on SrTiO3. In comparison, their substantial contributions to inventing the high-Tc superconducting field-effect transistor remain relatively unknown. Nevertheless, their efforts were crucial in developing the electric field effect into a valuable tool for studying a broad spectrum of complex materials. This article provides a brief overview of these developments and of the current status in this field, with a particular focus on Alex M\"uller's visionary role in advancing the field following the discovery of high-temperature superconductivity.Comment: Contribution to a planned memorial issue for K.A. M\"uller by Physica