Quantum dot manipulation in a single-walled carbon nanotube using a carbon nanotube gate

Abstract

Cross junctions of carbon nanotubes (CNTs) separated by thin oxide layers have been fabricated, in which the top CNT is used as a local gate to control the electron transport through the lower CNT. Coulomb oscillation was observed in the lower CNTs at low temperatures. The gating field from the upper CNTs is seen to modulate the band structure in the lower CNTs, producing double quantum dot systems. The ability to modulate the electronic structure of CNTs in such a way opens up many possibilities for future electronic and logical nanodevices.

Eutectic alloy electrode for rigid and low resistance carbon nanotube contact

“…[30][31][32][33][34] For example, it is difficult to employ the AC DEP method to deposit two CNTs in cross direction because the electric field applied to deposit the second CNT forces the first CNT out of its position. [30][31][32][33][34] For example, it is difficult to employ the AC DEP method to deposit two CNTs in cross direction because the electric field applied to deposit the second CNT forces the first CNT out of its position.…”

Dielectrophoresis assembly of multiwall carbon nanotubes for creating cylindrical clusters

“…Also, can be defined as where represent the frequency-dependent complex permittivities of the CNT and medium, respectively. Furthermore, the complex permittivity can be defined as ( 3 ) where is , is permittivity of the dielectric, σ is the conductivity of the dielectric, and is the frequency of the applied AC electric field. Apparently, depends not only on the electrical properties of the nanotube and the medium, but also the frequency of the applied AC electric field.…”

“…Positioning CNTs to the desired location for specific applications is the key to effective utilization of the materials [2] [3]. By using external AC electric fields, CNTs in a dispersed solution will polarized, and tend to align with direction of the external field.…”

A Study of Deterministic Positioning of Carbon Nanotubes by Dielectrophoresis

“…1 A major technological challenge is the ability to localize the CNTs on the substrate for controlled device and circuit fabrication. For many applications it is highly desirable to have a dense array of CNTs 2 ; however, in order to systematically study the intrinsic properties of CNTs and build novel sensitive systems 3,4 it is necessary to control precisely the position of a single CNT. Dielectrophoresis 5 is defined as the motion of matter caused by polarization effects in a nonuniform electric field.…”