[5p-A202-1~18] 6.3 Oxide electronics

[5p-A202-1] Quantized Conductance Observed in an Ag/PEO/Pt Structure

〇Tohru Tsuruoka¹, Karthik Krishnan¹, Manoharan Muruganathan², Hiroshi Mizuta², Masakazu Aono¹ (1.NIMS, 2.JAIST)

Keywords:quantized conductance, metal/polymer/metal structure, atomic point contact

Highly-controlled conductance quantization is achieved in an Ag/poly(ethylene oxide) (PEO)/Pt structure. Current–voltage measurements revealed reproducible quantized conductance below 10G₀ under bias voltage sweep, where G₀ corresponds to the conductance of a single-atom point contact (= 2e²/h). The Ag/PEO/Pt exhibited a conductance state distribution with distinct peaks of integer and half-integer multiples of G₀ accompanied with small fractional variations. First-principles density functional theory simulations showed that the experimental observations could be explained by the existence of a tunneling gap and the structural rearrangement in an atomic point contact.