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@BOOK{Go:136360,
      author       = {Goß, Karin},
      title        = {{I}nteractions between parallel carbon nanotube quantum
                      dots},
      volume       = {30},
      school       = {Universität Duisburg},
      type         = {Dr.},
      address      = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-136360},
      isbn         = {978-3-89336-740-5},
      series       = {Schriften des Forschungszentrums Jülich. Reihe
                      Schlüsseltechnologien / key technologies},
      pages        = {VIII, 139 S.},
      year         = {2011},
      note         = {Record converted from JUWEL: 18.07.2013; Universität
                      Duisburg, Diss., 2011},
      abstract     = {The subject of this thesis is molecular interactions which
                      are investigated using the example of parallel quantum dots
                      formed in the individual strands of a carbon nanotube rope.
                      For molecular electronics, carbon nanotubes offer a variety
                      of macromolecular structures and by combining several
                      nanotubes into a rope, also a generic system to probe
                      molecular interactions. First, the structure of the
                      contacted rope is characterized by tip-enhanced Raman
                      spectroscopy (TERS). We observe a clear resonance effect for
                      the Raman scattering process, which is up to now not
                      considered in the literature on TERS of carbon nanotubes. By
                      extracting the diameter, metallicity and chirality, seven
                      carbon nanotubes within the rope are identified. A redshift
                      of their optical transition energies is attributed to
                      interactions between the strands. In quantum transport
                      measurements, the nanotubes are found to form interacting
                      parallel quantum dots. Within the framework of master
                      equations, a model is developed to describe the transport
                      via the quantum dot system, where the parallel dots are
                      capacitively and tunnel coupled. Employing this model, seven
                      parallel quantum dots are characterized by their
                      interactions. Along with changing interface properties
                      predicted by the TERS characterization, the coupling to the
                      two contacts is very asymmetric for most of the quantum
                      dots. Additionally, the coupling to the gate electrode is
                      found to vary strongly for individual dots, allowing one to
                      tune the quantum dot system into different configurations
                      and selectively add electrons to individual strands of the
                      rope. Exploiting this differential gating effect, the
                      magnitude of the molecular interactions can be investigated.
                      Here, we find that individual strands within one carbon
                      nanotube rope can interact very distinctly. Amongst the
                      coupled quantum dots with a coupling stronger than
                      previously assumed, we also find only capacitively
                      interacting or completely uncoupled quantum dots within the
                      one device. The tunnel coupling is a hybridization of
                      quantum dot states which, in principle, are comprised of the
                      molecular orbitals. In particular, the sign of the
                      hybridization amplitude contains information about the
                      involved wavefunctions, where we always find a negative
                      amplitude denoting the overlap of wavefunctions with the
                      same sign. The hybridization can be manipulated by an
                      applied magnetic field and hence selectively suppressed due
                      to spin effects. Here, the differential gating allows for
                      tuning to distinct spin configurations of the quantum dot
                      system. In conclusion, we demonstrate a tunable quantum
                      device which provides the possibility of probing molecular
                      interactions by quantum transport spectroscopy. The
                      additional characterization using TERS represents a novel
                      combination of two experimental techniques with great
                      potential in the field of molecular electronics.},
      cin          = {PGI-6},
      ddc          = {500},
      cid          = {I:(DE-Juel1)PGI-6-20110106},
      typ          = {PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/136360},
}