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Direct observation of many-body charge density oscillations in a two-dimensional electron gas

Please always quote using this URN: urn:nbn:de:bvb:20-opus-145246
  • Quantum interference is a striking manifestation of one of the basic concepts of quantum mechanics: the particle-wave duality. A spectacular visualization of this effect is the standing wave pattern produced by elastic scattering of surface electrons around defects, which corresponds to a modulation of the electronic local density of states and can be imaged using a scanning tunnelling microscope. To date, quantum-interference measurements were mainly interpreted in terms of interfering electrons or holes of the underlying band-structureQuantum interference is a striking manifestation of one of the basic concepts of quantum mechanics: the particle-wave duality. A spectacular visualization of this effect is the standing wave pattern produced by elastic scattering of surface electrons around defects, which corresponds to a modulation of the electronic local density of states and can be imaged using a scanning tunnelling microscope. To date, quantum-interference measurements were mainly interpreted in terms of interfering electrons or holes of the underlying band-structure description. Here, by imaging energy-dependent standing-wave patterns at noble metal surfaces, we reveal, in addition to the conventional surface-state band, the existence of an 'anomalous' energy band with a well-defined dispersion. Its origin is explained by the presence of a satellite in the structure of the many-body spectral function, which is related to the acoustic surface plasmon. Visualizing the corresponding charge oscillations provides thus direct access to many-body interactions at the atomic scale.show moreshow less

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Metadaten
Author: Paolo Sessi, Vyacheslav M. Silkin, Ilya A. Nechaev, Thomas Bathon, Lydia El-Kareh, Evgueni V. Chulkov, Pedro M. Echenique, Matthias Bode
URN:urn:nbn:de:bvb:20-opus-145246
Document Type:Journal article
Faculties:Fakultät für Physik und Astronomie / Physikalisches Institut
Language:English
Parent Title (English):Nature Communications
Year of Completion:2015
Volume:6
Issue:8691
Source:Nature Communications 6:8691 (2015). DOI: 10.1038/ncomms9691
DOI:https://doi.org/10.1038/ncomms9691
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Tag:Cu(111); acoustic surface plasmon; excitations; local density; metal surfaces; microscopy; scanning tunneling spectroscopy; standing wave formation; states; steps
Release Date:2018/11/06
Licence (German):License LogoCC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International