You're asking for a thermal jumper. I don't know much about the inside of CPUs either. But I know that at the PCB-level, we use these devices to carry heat but

You're asking for a thermal jumper. I don't know much about the inside of CPUs either. But I know that at the PCB-level, we use these devices to carry heat but not electricity. https://www.vishay.com/en/product/60157/ https://www.vishay.com/en/product/60157/ Copper is still better at conducting heat. But just a little bit of thermal-jumper to make that small electrical separation is all you need. Datasheet: https://www.vishay.com/docs/60157/thjp.pdf https://www.vishay.com/docs/60157/thjp.pdf In any case, modern material science provides us with plenty of useful insulators, conductors, thermal-conductors (but not electrical), semiconductors, and now semi-heat conductors (erm, thermal semiconductor?) I don't expect the thermal semiconductor to be replacing any of the other materials we already use. Instead, we will find new discoveries and applications for things I can barely imagine.