Publikation:

Impurity scattering and size quantization effects in a single graphene nanoflake

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Tesch_0-398446.pdf
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2017

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Bergvall, Anders
Löfwander, Tomas

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http://nbn-resolving.de/urn:nbn:de:bsz:352-0-398446
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https://doi.org/10.1103/PhysRevB.95.075429
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http://arxiv.org/abs/1702.07887

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Published

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Physical Review B. 2017, 95(7), 075429. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.95.075429

Zusammenfassung

By using Fourier-transform scanning tunneling spectroscopy we measure the interference patterns produced by the impurity scattering of confined Dirac quasiparticles in epitaxial graphene nanoflakes. Upon comparison of the experimental results with tight-binding calculations of realistic model flakes, we show that the characteristic features observed in the Fourier-transformed local density of states are related to scattering between different transverse modes (subbands) of a graphene nanoflake and allow direct insight into the gapped electronic spectrum of graphene. We also observe a strong reduction of quasiparticle lifetime which is attributed to the interaction with the underlying substrate. In addition, we show that the distribution of the on-site energies at flower defects leads to an effectively broken pseudospin selection rule, where intravalley backscattering is allowed.

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530 Physik

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ISO 690TESCH, Julia, Philipp LEICHT, Felix BLUMENSCHEIN, Luca GRAGNANIELLO, Anders BERGVALL, Tomas LÖFWANDER, Mikhail FONIN, 2017. Impurity scattering and size quantization effects in a single graphene nanoflake. In: Physical Review B. 2017, 95(7), 075429. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.95.075429
BibTex
@article{Tesch2017Impur-37934,
  year={2017},
  doi={10.1103/PhysRevB.95.075429},
  title={Impurity scattering and size quantization effects in a single graphene nanoflake},
  number={7},
  volume={95},
  issn={2469-9950},
  journal={Physical Review B},
  author={Tesch, Julia and Leicht, Philipp and Blumenschein, Felix and Gragnaniello, Luca and Bergvall, Anders and Löfwander, Tomas and Fonin, Mikhail},
  note={11 pages, 3 figures Article Number: 075429}
}
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11 pages, 3 figures
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