Electron transport in crossed nanotubes with a point contact

Abstract

The electron transport in a four-terminal nanodevice consisting of two crossed nanotubes is investigated in the framework of the Landauer-Büttiker formalism. The evident formula for the ballistic conductance of the device is found using a model of crossed conductive cylinders with a point contact between them. Sharp conductance dips stipulated by resonance scattering on the contact are shown to appear in the conductance of the first cylinder. The conductance between the cylinders has resonant behavior. The form and the position of resonant peaks are studied. Our results indicate that the form of asymmetric dips and peaks in the conductance differs from the well-known Fano line shape ͓Phys. Rev. 124, 1866 ͑1961͔͒. We have shown that the maximal value of the conductance between cylinders does not exceed a unit of the conductance quantum.

Photophysical and theoretical investigations of the [8]cycloparaphenylene radical cation and its charge-resonance dimer

“…Prior theoretical 78 and experimental work on systems consisting of two crossed nanotubes has showed that metal-metal nanotube junctions have a very high conductance (0.1-0.2 e 2 /h). [79][80][81] In addition, studies have shown a relationship between diameter and conductance in networks made exclusively of CNT bundles. 82 To our knowledge, however, there has been no single study explicitly relating CNT diameter and conductance across CNT-CNT junctions.…”

Spin filtering and entanglement detection due to spin-orbit interaction in carbon nanotube cross-junctions

“…1 are attractive candidates for further experimental progress for both spin-resolved transport and the detection of entanglement signatures. While such cross-junctions have already attracted much interest experimentally [45][46][47][48][49][50][51] and theoretically, [52][53][54][55][56][57] the novel features due to SOI have never been investigated before. Here we take the SOI fully into account, and consider setups with weak (usually sub-tesla) magnetic fields B in the plane spanned by the two CNTs, often with B parallel to one of the CNTs.…”

Tomography of Feshbach resonance states

“…However, an effective way to select states with a certain amount of total angular momentum is to leverage different shape resonances of the neutral collision complex. This could be done with the merged beam approach, in which collision dynamics could be tuned down to a single quantum of angular momentum (36). Performing coincidence experiments in the p-wave limit will demonstrate the control of the final-state distribution.…”