| （英） |
The molecular motors in biological systems harvest energy from thermal noise and generate coherent motion. Its mechanism is called Brownian ratchet. To realize this unique function electrically and apply it to electronics, formation of an asymmetric potential in a one-dimensional channel is necessary. In this study we design, fabricate, and characterize GaAs-based nanowire transistors having an asymmetric Schottky wrap gate. The device design is carried out on the basis of the three-dimensional potential simulation. We confirm the formation of the asymmetric potential in the channel from threshold voltage difference in transfer characteristics measured by switching source and drain electrodes. The barrier height is evaluated from Arrhenius plot. On the basis of the obtained results, we discuss possible conditions for Brownian ratchet operation of the present device design. |