Magnetic field control of the Franck-Condon coupling of few-electron quantum states

P. L. Stiller, A. Dirnaichner, D. R. Schmid, A. K. Huettel*

*Corresponding author for this work

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Abstract

Suspended carbon nanotubes display at cryogenic temperatures a distinct interaction between the quantized longitudinal vibration of the macromolecule and its embedded quantum dot, visible via Franck-Condon conductance sidebands in transport spectroscopy. We present data on such sidebands at known absolute number N-el = 1 and N-el = 2 of conduction band electrons and, consequently, well-defined electronic ground and excited states in a clean nanotube device. The interaction evolves only at a finite axial magnetic field and displays a distinct magnetic-field dependence of the Franck-Condon coupling parameter, different for different electronic base states and indicating a valley dependence. Reshaping of the electronic wave function by the magnetic field is discussed as a possible cause of our observations; its impact is demonstrated in a model calculation reproducing the field-dependent coupling.

Original languageEnglish
Article number115408
Number of pages13
JournalPhysical Review B
Volume102
Issue number11
DOIs
Publication statusPublished - 9 Sep 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • CARBON
  • SINGLE
  • BLOCKADE
  • OSCILLATIONS
  • TRANSPORT
  • DOTS

Cite this

Stiller, P. L., Dirnaichner, A., Schmid, D. R., & Huettel, A. K. (2020). Magnetic field control of the Franck-Condon coupling of few-electron quantum states. Physical Review B, 102(11), [115408]. https://doi.org/10.1103/PhysRevB.102.115408