Magnetic field control of the Franck-Condon coupling of few-electron quantum states
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2020-09-09
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en
Pages
13
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Physical Review B, Volume 102, issue 11
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.Description
Keywords
CARBON, SINGLE, BLOCKADE, OSCILLATIONS, TRANSPORT, DOTS
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Citation
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, vol. 102, no. 11, 115408 . https://doi.org/10.1103/PhysRevB.102.115408