Imaging of Carbon Nanotube Electronic States Polarized by the Field of an Excited Quantum Dot

Duc Nguyen, Alison Wallum, Huy A. Nguyen, Nhan T. Nguyen, Joseph W Lyding, Martin H W Gruebele

Research output: Contribution to journalArticle

Abstract

Efficient heat dissipation and large gate capacitance have made carbon nanotube field-effect transistors (CNT FETs) devices of interest for over 20 years. The mechanism of CNT FETs involves localization of the electronic structure due to a transverse electric field, yet little is known about the localization effect, nor has the electronic polarization been visualized directly. Here, we co-deposit PbS quantum dots (QDs) with CNTs and optically excite the QD so its excited-state dipolar field biases the local environment of a CNT. Using single-molecule absorption scanning tunneling microscopy, we show that the electronic states of the CNT become transversely localized. By nudging QDs to different distances from the CNT, the magnitude of the localization can be controlled. Different bias voltages probe the degree of localization in different CNT excited states. A simple tight-binding model for the CNT in an electrostatic field provides a semiquantitative model for the observed behavior.

Original languageEnglish (US)
Pages (from-to)1012-1018
Number of pages7
JournalACS Nano
Volume13
Issue number2
DOIs
StatePublished - Feb 26 2019

Fingerprint

Carbon Nanotubes
Electronic states
Carbon nanotube field effect transistors
Semiconductor quantum dots
Carbon nanotubes
carbon nanotubes
quantum dots
Imaging techniques
Excited states
Electric fields
electronics
Scanning tunneling microscopy
Bias voltage
Heat losses
Electronic structure
Capacitance
Deposits
Polarization
Molecules
field effect transistors

Keywords

  • Carbon nanotube
  • Dipole-induced polarization
  • Quantum dot
  • Single-molecule absorption scanning tunneling microscopy
  • Tight-binding calculation

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Imaging of Carbon Nanotube Electronic States Polarized by the Field of an Excited Quantum Dot. / Nguyen, Duc; Wallum, Alison; Nguyen, Huy A.; Nguyen, Nhan T.; Lyding, Joseph W; Gruebele, Martin H W.

In: ACS Nano, Vol. 13, No. 2, 26.02.2019, p. 1012-1018.

Research output: Contribution to journalArticle

Nguyen, Duc ; Wallum, Alison ; Nguyen, Huy A. ; Nguyen, Nhan T. ; Lyding, Joseph W ; Gruebele, Martin H W. / Imaging of Carbon Nanotube Electronic States Polarized by the Field of an Excited Quantum Dot. In: ACS Nano. 2019 ; Vol. 13, No. 2. pp. 1012-1018.
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