Multiple negative resistances in trenched structures bridged with carbon nanotubes

Abstract

Field effect transistor (FET)-like structures with a trench as “gate” were fabricated on GaAs substrates. The bottom of the trench as well as the “source” and “drain” regions were metallized. Bundles of nanotubes were then suspended over the trench. At a certain threshold, these trenched FET-like structures display an S-shaped negative resistance, which breaks into parallel branches when the voltage is increased in equal steps. Several such steps were observed at room temperature and under normal pressure. The steps were reversibly enabled and disabled via changes in the applied voltage. A maximum stable gain with a quasilinear behavior was observed between 0.5 and 3.25GHz.

RF Nanotechnology—Concept, Birth, Mission, and Perspectives [Member Benefits

“…In fact, transistor action was first demonstrated in carbon nanotubes [6], and regarding RF applications [7], [8], it has been recently shown that FM and digital radio demodulation is possible using carbon nanotubes nanoelectromechanical systems [9] (see Figure 3). Gate Length 240 nm 550 nm RF/microwave technology will be fundamentally influenced by nanotechnology.…”

Mixed volatility in a single device: memristive non-volatile and threshold switching in SmNiO3/BaTiO3 devices

“…Both threshold and memristive switching have their uses in neuromorphic circuits, and these effects can be linked to provide the necessary behaviors for use in programmable networks or as integrate-and-fire elements, in which the memristive memory integrates the incoming pulses and the threshold switch provides spiking behaviors (Mao et al, 2023). NDR responses in different materials have been shown to be programmable using the field effect in transistor geometry (Dragoman et al, 2008), and this programmability can be used to produce multivalued memory and dynamically reconfigurable logic operations (Sistani et al, 2021). Mixed volatility is generally a desirable property in many proposed neuromorphic circuits as it allows the systems to operate over a wide range of biologically relevant timescales from milliseconds to days (Gerstner et al, 2018).…”