Electron transport through single carbon nanotubes

Chai, Guangyu; Heinrich, Helge; Chow, Lee; Schenkel, T.

doi:10.1063/1.2778551

Cited by 51 publications

(37 citation statements)

References 13 publications

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“…However, it is questionable whether conditions required for channeling of fast ions leading to the rainbow effect can be met in capillaries with such characteristics [19,35]. On the other hand, in cases where carbon nanotubes are grown in amorphous channels in a dielectric such as Al 2 O 3 [2] and SiO 2 [3], or are coated by an amorphous layer of metal [5,36], it is precisely the regular atomic structure of carbon nanotube that acts as a smooth "sleeve", or "mantle" covering the underlying rough surface of the surrounding material, thus enabling ion channeling through such structures. It remains to be seen, however, whether large, multi-walled carbon nanotubes can be grown inside the broad capillaries in metals enabling some sort of ion channeling in their interior hollow regions.…”

Section: Introductionmentioning

confidence: 99%

Dynamic polarization effects on the angular distributions of protons channeled through carbon nanotubes in dielectric media

et al. 2008

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The best level of ordering and straightening of carbon nanotube arrays is often achieved when they are grown in a dielectric matrix, so such structures present the most suitable candidates for future channeling experiments with carbon nanotubes. Consequently, we investigate here how the dynamic polarization of carbon valence electrons in the presence of various surrounding dielectric media affects the angular distributions of protons channeled through (11, 9) single-wall carbon nanotubes. Proton speeds between 3 and 10 a.u., corresponding to energies of 0.223 and 2.49 MeV, are chosen with the nanotube's length varied between 0.1 and 1 µm. We describe the repulsive interaction between a proton and the nanotube's atoms in a continuum-potential approximation based on the Doyle-Turner potential, whereas the attractive image force on a proton is calculated using a twodimensional hydrodynamic model for the dynamic response of the nanotube valence electrons, while assigning to the surrounding medium an appropriate (frequency dependent) dielectric function. The angular distributions of channeled protons are generated using a computer simulation method which solves the proton equations of motion in the transverse plane numerically. Our analysis shows that the presence of a dielectric medium can strongly affect both the appearance and positions of maxima in the angular distributions of channeled protons.

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Section: Introductionmentioning

confidence: 99%

Dynamic polarization effects on the angular distributions of protons channeled through carbon nanotubes in dielectric media

et al. 2008

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“…Holes with diameters as small as 5 nm have been formed using FIB based drilling and local thin film deposition, 19 and recent demonstrations of electron channeling along the hollow cores of multiwall carbon nanotubes suggest that these ultimate beam collimators might enable even smaller effective ion beam spot sizes. 20 Finally, diffusion during required activation annealing is minimal for antimony, and no segregation effects have been found, confirming bulklike diffusivities of ϳ6 ϫ 10 −15 cm 2 / s, 12 which lead to only minimal dopant movement by a few nanometers even for standard rapid thermal annealing ͑RTA͒ conditions ͑e.g., 1000°C, 10 s͒. This is in contrast to phosphorus, which segregates during RTA to the SiO 2 / Si interface.…”

Section: Discussion and Outlookmentioning

confidence: 65%

Single atom doping for quantum device development in diamond and silicon

Weis

Schuh

Batra

et al. 2008

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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The ability to inject dopant atoms with high spatial resolution, flexibility in dopant species, and high single ion detection fidelity opens opportunities for the study of dopant fluctuation effects and the development of devices in which function is based on the manipulation of quantum states in single atoms, such as proposed quantum computers. The authors describe a single atom injector, in which the imaging and alignment capabilities of a scanning force microscope ͑SFM͒ are integrated with ion beams from a series of ion sources and with sensitive detection of current transients induced by incident ions. Ion beams are collimated by a small hole in the SFM tip and current changes induced by single ion impacts in transistor channels enable reliable detection of single ion hits. They discuss resolution limiting factors in ion placement and processing and paths to single atom ͑and color center͒ array formation for systematic testing of quantum computer architectures in silicon and diamond.

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“…The first experimental data on ion channeling through nanotubes were reported by Zhu et al [11]. The first experiment with guiding of electrons by nanotubes was performed by Chai et al [12].…”

Section: Introductionmentioning

confidence: 96%