Nanometer-scale loop currents and induced magnetic dipoles in carbon nanotubes with defects

Jino Im, Youngkuk Kim, Choong Ki Lee, Minsung Kim, Jisoon Ihm, Hyoung Joon Choi

Research output: Contribution to journalArticle

5 Citations (Scopus)

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 languageEnglish
Pages (from-to)1418-1422
Number of pages5
JournalNano Letters
Volume11
Issue number4
DOIs
Publication statusPublished - 2011 Apr 13

Fingerprint

Carbon Nanotubes
magnetic dipoles
Carbon nanotubes
carbon nanotubes
Defects
defects
interference
Electric currents
electric current
Nanostructures
Modulation
Magnetic fields
dipoles
modulation
conduction
energy
Electrons
Electric potential
electric potential
electronics

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Im, Jino ; Kim, Youngkuk ; Lee, Choong Ki ; Kim, Minsung ; Ihm, Jisoon ; Choi, Hyoung Joon. / Nanometer-scale loop currents and induced magnetic dipoles in carbon nanotubes with defects. In: Nano Letters. 2011 ; Vol. 11, No. 4. pp. 1418-1422.
@article{9d9518cce1624fcca4d6064b986c37e4,
title = "Nanometer-scale loop currents and induced magnetic dipoles in carbon nanotubes with defects",
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.",
author = "Jino Im and Youngkuk Kim and Lee, {Choong Ki} and Minsung Kim and Jisoon Ihm and Choi, {Hyoung Joon}",
year = "2011",
month = "4",
day = "13",
doi = "10.1021/nl1033254",
language = "English",
volume = "11",
pages = "1418--1422",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "4",

}

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 journalArticle

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.

UR - http://www.scopus.com/inward/record.url?scp=79954467884&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79954467884&partnerID=8YFLogxK

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 -