Supercoupling effect prevents the simultaneous formation of inversion and accumulation channels at the two interfaces of ultrathin silicon-on-insulator metal-oxide-semiconductor field-effect transistor. Our work highlights that short-channel effects enhance supercoupling and turn it into a two-dimensional mechanism. The lateral influence of source and drain terminals is evidenced with experimental data and examined by 2D numerical simulations which reveal the roles of gate length and drain bias. The critical Si-film thickness, below which supercoupling arises, is significantly increased in short-channel transistors. The impact of back-gate and drain bias, BOX thickness, and quantum effects is documented and practical applications are discussed.

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