Disentanglement of the unoccupied electronic structure in metallic and semiconducting C-60 peapods

Autor(en)

Christian Kramberger, Paola Ayala, Hidetsugu Shiozawa, Ferenc Simon, Alexander Friedrich, Xianjie Liu, Mark Rümmeli, Yasumitsu Miyata, Hiromichi Kataura, Patrick Hoffmann, Thomas Pichler

Abstrakt

We provide insight into the C1s x-ray absorption response of C-60 encaged in metallicity-sorted single-walled carbon nanotubes. The partial density of states observed for different constituent species unveils their distinct electronic properties. We identify the relative positions and filling of the one-dimensional van Hove singularities in the hosting nanotubes and the molecular orbitals of the encaged fullerenes. We directly address the possible charge transfer and especially the predicted existence of a shallow half-filled electronic t(1u) band in metallic peapods. In the experiment, we find the t(1u) of C-60 unoccupied in the semiconducting nanotubes. In metallic nanotubes, it is observed 100-200 meV above the Fermi level E-F.

Organisation(en)

Elektronische Materialeigenschaften

Externe Organisation(en)

Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, National Institute of Advanced Industrial Science and Technology (AIST), Helmholtz-Zentrum Berlin für Materialien und Energie, University of Surrey

Journal

Physical Review B

Band

83

Anzahl der Seiten

5

ISSN

1098-0121

DOI

https://doi.org/10.1103/PhysRevB.83.195438

Publikationsdatum

2011

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/6b8bdf10-f6ab-4178-8fd1-7fc79cd78325