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Su(4) mixed valence regime in carbon nanotube quantum dots

Publication ,  Journal Article
Makarovski, A; Finkelstein, G
Published in: Physica B: Condensed Matter
April 1, 2008

We study the evolution of conductance regimes in carbon nanotubes with doubly degenerate orbitals ("shells") by controlling the contact transparency within the same sample. For sufficiently open contacts, Kondo behavior is observed for 1, 2, and 3 electrons in the topmost shell. As the contacts are opened more, the sample enters the "mixed valence" regime, where different charge states are strongly hybridized by electron tunneling. Here, the conductance as a function of gate voltage shows pronounced modulations with a period of four electrons, and all single-electron features are washed away at low temperature. We successfully describe this behavior by a simple formula with no fitting parameters. Finally, we find a surprisingly small energy scale that controls the temperature evolution of conductance and the tunneling density of states in the mixed valence regime. © 2007 Elsevier B.V. All rights reserved.

Duke Scholars

Published In

Physica B: Condensed Matter

DOI

ISSN

0921-4526

Publication Date

April 1, 2008

Volume

403

Issue

5-9

Start / End Page

1555 / 1557

Related Subject Headings

  • General Physics
  • 5104 Condensed matter physics
  • 0303 Macromolecular and Materials Chemistry
  • 0206 Quantum Physics
  • 0204 Condensed Matter Physics
 

Citation

APA
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MLA
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Makarovski, A., & Finkelstein, G. (2008). Su(4) mixed valence regime in carbon nanotube quantum dots. Physica B: Condensed Matter, 403(5–9), 1555–1557. https://doi.org/10.1016/j.physb.2007.10.367
Makarovski, A., and G. Finkelstein. “Su(4) mixed valence regime in carbon nanotube quantum dots.” Physica B: Condensed Matter 403, no. 5–9 (April 1, 2008): 1555–57. https://doi.org/10.1016/j.physb.2007.10.367.
Makarovski A, Finkelstein G. Su(4) mixed valence regime in carbon nanotube quantum dots. Physica B: Condensed Matter. 2008 Apr 1;403(5–9):1555–7.
Makarovski, A., and G. Finkelstein. “Su(4) mixed valence regime in carbon nanotube quantum dots.” Physica B: Condensed Matter, vol. 403, no. 5–9, Apr. 2008, pp. 1555–57. Scopus, doi:10.1016/j.physb.2007.10.367.
Makarovski A, Finkelstein G. Su(4) mixed valence regime in carbon nanotube quantum dots. Physica B: Condensed Matter. 2008 Apr 1;403(5–9):1555–1557.
Journal cover image

Published In

Physica B: Condensed Matter

DOI

ISSN

0921-4526

Publication Date

April 1, 2008

Volume

403

Issue

5-9

Start / End Page

1555 / 1557

Related Subject Headings

  • General Physics
  • 5104 Condensed matter physics
  • 0303 Macromolecular and Materials Chemistry
  • 0206 Quantum Physics
  • 0204 Condensed Matter Physics