title: Asymmetry-induced resistive switching in Ag-Ag2S-Ag memristors enabling a simplified atomic-scale memory design.
abstract: Prevailing models of resistive switching arising from electrochemical formation of conducting filaments across solid state ionic conductors commonly attribute the observed polarity of the voltage-biased switching to the sequence of the active and inert electrodes confining the resistive switching memory cell. Here we demonstrate stable switching behaviour in metallic Ag-Ag2S-Ag nanojunctions at room temperature exhibiting similar characteristics. Our experimental results and numerical simulations reveal that the polarity of the switchings is solely determined by the geometrical asymmetry of the electrode surfaces. By the lithographical design of a proof of principle device we demonstrate the merits of simplified fabrication of atomic-scale, robust planar Ag2S memory cells.
authors.affiliation: Department of Physics, Budapest University of Technology and Economics, Budafoki ut 8, 1111 Budapest, Hungary.|MTA-BME Condensed Matter Research Group, Budafoki ut 8, 1111 Budapest, Hungary.
authors.forename: Agnes
authors.initials: A
authors.lastname: Gubicza
authors.affiliation: Physics Department, Lancaster University, Lancaster, UK.
authors.forename: Dávid Zs
authors.initials: DZ
authors.lastname: Manrique
authors.affiliation: Department of Physics, Budapest University of Technology and Economics, Budafoki ut 8, 1111 Budapest, Hungary.|MTA-BME Condensed Matter Research Group, Budafoki ut 8, 1111 Budapest, Hungary.
authors.forename: László
authors.initials: L
authors.lastname: Pósa
authors.affiliation: Physics Department, Lancaster University, Lancaster, UK.
authors.forename: Colin J
authors.initials: CJ
authors.lastname: Lambert
authors.affiliation: Department of Physics, Budapest University of Technology and Economics, Budafoki ut 8, 1111 Budapest, Hungary.|MTA-BME Condensed Matter Research Group, Budafoki ut 8, 1111 Budapest, Hungary.
authors.forename: György
authors.initials: G
authors.lastname: Mihály
authors.affiliation: Department of Physics, Budapest University of Technology and Economics, Budafoki ut 8, 1111 Budapest, Hungary.|MTA-BME Condensed Matter Research Group, Budafoki ut 8, 1111 Budapest, Hungary.
authors.forename: Miklós
authors.initials: M
authors.lastname: Csontos
authors.affiliation: Department of Physics, Budapest University of Technology and Economics, Budafoki ut 8, 1111 Budapest, Hungary.|MTA-BME Condensed Matter Research Group, Budafoki ut 8, 1111 Budapest, Hungary.
authors.forename: András
authors.initials: A
authors.lastname: Halbritter