Fig. 5

Schematic diagrams of the Al₂O₃/LN bilayer structure switched in type I or type II. a The sketch of the equivalent on-off circuit of the in-series resistors and capacitors for the Al₂O₃ tunnel switch. b Initial preferred polarization orientation and built-in electric field; c The Al₂O₃ tunnel switch turning on and domain switching; d The Al₂O₃ tunnel switch switching off and polarization maintain