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Suppression of Quasiparticle Scattering Signals in Bilayer Graphene Due to Layer Polarization and Destructive Interference

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2018

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Jolie, Wouter
Lux, Jonathan
Pörtner, Mathias
Dombrowski, Daniela
Herbig, Charlotte
Knispel, Timo
Michely, Thomas
Rosch, Achim
Busse, Carsten

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https://doi.org/10.1103/PhysRevLett.120.106801
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Physical Review Letters. 2018, 120(10), 106801. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.120.106801

Zusammenfassung

We study chemically gated bilayer graphene using scanning tunneling microscopy and spectroscopy complemented by tight-binding calculations. Gating is achieved by intercalating Cs between bilayer graphene and Ir(111), thereby shifting the conduction band minima below the chemical potential. Scattering between electronic states (both intraband and interband) is detected via quasiparticle interference. However, not all expected processes are visible in our experiment. We uncover two general effects causing this suppression: first, intercalation leads to an asymmetrical distribution of the states within the two layers, which significantly reduces the scanning tunneling spectroscopy signal of standing waves mainly present in the lower layer; second, forward scattering processes, connecting points on the constant energy contours with parallel velocities, do not produce pronounced standing waves due to destructive interference. We present a theory to describe the interference signal for a general n-band material.

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ISO 690JOLIE, Wouter, Jonathan LUX, Mathias PÖRTNER, Daniela DOMBROWSKI, Charlotte HERBIG, Timo KNISPEL, Sabina SIMON, Thomas MICHELY, Achim ROSCH, Carsten BUSSE, 2018. Suppression of Quasiparticle Scattering Signals in Bilayer Graphene Due to Layer Polarization and Destructive Interference. In: Physical Review Letters. 2018, 120(10), 106801. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.120.106801
BibTex
@article{Jolie2018-03-09Suppr-42433,
  year={2018},
  doi={10.1103/PhysRevLett.120.106801},
  title={Suppression of Quasiparticle Scattering Signals in Bilayer Graphene Due to Layer Polarization and Destructive Interference},
  number={10},
  volume={120},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Jolie, Wouter and Lux, Jonathan and Pörtner, Mathias and Dombrowski, Daniela and Herbig, Charlotte and Knispel, Timo and Simon, Sabina and Michely, Thomas and Rosch, Achim and Busse, Carsten},
  note={Article Number: 106801}
}
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