title: Switching kinetics of a Cu2S-based gap-type atomic switch.
abstract: The switching time of a Cu(2)S-based gap-type atomic switch is investigated as a function of temperature, bias voltage, and initial off-resistance. The gap-type atomic switch is realized using a scanning tunneling microscope (STM), in which the formation and annihilation of a Cu-atom bridge in the vacuum gap between the Cu(2)S electrode and the Pt tip of the STM are controlled by a solid-electrochemical reaction. Increasing the temperature decreases the switching time exponentially with an activation energy of about 1.38 eV. Increasing the bias voltage also shortens the switching time exponentially, exhibiting a greater exponent for the lower bias than for the higher bias. Furthermore, faster switching has been achieved by decreasing the initial off-resistance between the Cu(2)S electrode and STM tip. On the basis of these results, we suggest that, in addition to the chemical reaction, the electric field in the vacuum gap plays a significant role in the operation of a gap-type atomic switch. This investigation advances our understanding of the operating mechanism of an atomic switch, which is a new concept for future electronic devices.
authors.affiliation: WPI Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki, Japan. NAYAK.Alpana@nims.go.jp
authors.forename: Alpana
authors.initials: A
authors.lastname: Nayak
authors.forename: Tohru
authors.initials: T
authors.lastname: Tsuruoka
authors.forename: Kazuya
authors.initials: K
authors.lastname: Terabe
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Hasegawa
authors.forename: Masakazu
authors.initials: M
authors.lastname: Aono