Abstract
In metallic carbon nanotubes with defects, the electric current flow is expected to have characteristic spatial patterns depending on the nature of the defects. Here, we show, using first-principles transport calculations, that locally rotating loop currents in nanometer scale can be generated near defects in carbon nanotubes by quantum interference of conducting and quasi-bound states of electrons. The loop currents appear at energies near transmission dips, having opposite directions at lower- and higher-energy sides of the transmission dips and disappearing exactly at the centers of the dips. Temporal modulations of gate voltage around a transmission dip can produce oscillating magnetic dipoles, inducing magnetic fields that reflect characteristics of defects. This generation of loop currents and magnetic dipoles by quantum interference can generally occur in any nanostructure and it is potentially useful for novel electronic and magnetic nanodevices.
| Original language | English |
|---|---|
| Pages (from-to) | 1418-1422 |
| Number of pages | 5 |
| Journal | Nano Letters |
| Volume | 11 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2011 Apr 13 |
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All Science Journal Classification (ASJC) codes
- Bioengineering
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering
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Nanometer-scale loop currents and induced magnetic dipoles in carbon nanotubes with defects. / Im, Jino; Kim, Youngkuk; Lee, Choong Ki; Kim, Minsung; Ihm, Jisoon; Choi, Hyoung Joon.
In: Nano Letters, Vol. 11, No. 4, 13.04.2011, p. 1418-1422.Research output: Contribution to journal › Article
TY - JOUR
T1 - Nanometer-scale loop currents and induced magnetic dipoles in carbon nanotubes with defects
AU - Im, Jino
AU - Kim, Youngkuk
AU - Lee, Choong Ki
AU - Kim, Minsung
AU - Ihm, Jisoon
AU - Choi, Hyoung Joon
PY - 2011/4/13
Y1 - 2011/4/13
N2 - In metallic carbon nanotubes with defects, the electric current flow is expected to have characteristic spatial patterns depending on the nature of the defects. Here, we show, using first-principles transport calculations, that locally rotating loop currents in nanometer scale can be generated near defects in carbon nanotubes by quantum interference of conducting and quasi-bound states of electrons. The loop currents appear at energies near transmission dips, having opposite directions at lower- and higher-energy sides of the transmission dips and disappearing exactly at the centers of the dips. Temporal modulations of gate voltage around a transmission dip can produce oscillating magnetic dipoles, inducing magnetic fields that reflect characteristics of defects. This generation of loop currents and magnetic dipoles by quantum interference can generally occur in any nanostructure and it is potentially useful for novel electronic and magnetic nanodevices.
AB - In metallic carbon nanotubes with defects, the electric current flow is expected to have characteristic spatial patterns depending on the nature of the defects. Here, we show, using first-principles transport calculations, that locally rotating loop currents in nanometer scale can be generated near defects in carbon nanotubes by quantum interference of conducting and quasi-bound states of electrons. The loop currents appear at energies near transmission dips, having opposite directions at lower- and higher-energy sides of the transmission dips and disappearing exactly at the centers of the dips. Temporal modulations of gate voltage around a transmission dip can produce oscillating magnetic dipoles, inducing magnetic fields that reflect characteristics of defects. This generation of loop currents and magnetic dipoles by quantum interference can generally occur in any nanostructure and it is potentially useful for novel electronic and magnetic nanodevices.
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U2 - 10.1021/nl1033254
DO - 10.1021/nl1033254
M3 - Article
VL - 11
SP - 1418
EP - 1422
JO - Nano Letters
JF - Nano Letters
SN - 1530-6984
IS - 4
ER -