Layertronics: Gentle squeeze transforms 2D bismuth from semiconductor to metal, demonstrating a multi-function single device without rewiring

https://www.eurekalert.org/news-releases/1103251

"van der Waals squeezing reorganizes atoms from slightly buckled to perfectly flat, eliminating energy band gap, allowing electrons to move freely making conductive like a metal... trilayer heterostructure: bismuth squeezed between 2 semiconductor molybdenum disulfide layers, 1 forming low-resistance (Ohmic) contact, other forming high-resistance (Schottky) barrier... applying perpendicular external electric field switches Ohmic contact between top/ bottom layers... asymmetric, reprogrammable, energy-efficient nanoelectronics"

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https://phys.org/news/2025-11-generation-energy-conversion-materials-simple.html